Spread Spectrum Data Transceiver MDS 05-2708A01, Rev.
QUICK START GUIDE 1. Install and connect the antenna system to the transceiver • Use a high-quality gain antenna, mounted in the clear. • Use a low-loss feedline such as LMR 400. • Preset directional antennas in the direction of desired transmission/reception. 2. Connect the data equipment to the radio’s DB-9F DATA connector • Connect only the required pins. EIA-232, shown below, typically uses only TXD, RXD and GND. (See Page 71 for EIA-485 interface connections.
CONTENTS 1.0 ABOUT THIS MANUAL .........................................................1 2.0 PRODUCT DESCRIPTION....................................................1 2.1 2.2 2.3 2.4 Transceiver Features ......................................................1 Model Number Codes .....................................................2 Spread Spectrum Radios—How Are They Different? .....2 Typical Applications ........................................................2 Multiple Address Systems (MAS) .............
5.2 Performance Optimization .............................................. 20 Antenna Aiming ............................................................... 20 Antenna SWR Check ...................................................... 20 Data Buffer Setting—Modbus Protocol ........................... 21 Hoptime Setting............................................................... 21 TotalFlow™ Protocol at 9600 with Sleep Mode............... 21 Operation at 115200 bps ........................................
CTSHOLD [0–60000].......................................................32 Clear-to-Send Hold Time DEVICE [DCE, CTS KEY] ..............................................32 Radio-MODEM Behavior DLINK [xxxxx/ON/OFF]....................................................32 InSite Diagnostics Link Support DKEY ...............................................................................33 Turn Off Radio Transmitter ‘s Test Signal DTYPE [NODE/ROOT] ....................................................
PORT [RS232, RS485] ................................................... 37 Data Interface Port Signaling Standard PWR [20–30]................................................................... 38 Radio Transmitter Power Level REPEAT [0–10] ............................................................... 38 Downstream Repeat Transmission Count RETRY [0–10] ................................................................. 38 Upstream Repeat Transmission Count RSSI...............................................
STAT ................................................................................43 Alarm Status TEMP...............................................................................43 Radio’s Internal Temperature TX [xxxx] ..........................................................................43 Radio Transmit Test Frequency UNIT [10000–65000] .......................................................43 Unit Address XADDR [0–31] .................................................................
9.1 SAF Operation with Extension Radios ........................... 52 Simple Extended SAF Network ....................................... 52 Extended SAF Network ................................................... 53 Retransmission and ARQ Operation ............................... 53 SAF Configuration Example ............................................ 53 9.2 Synchronizing Network Units .......................................... 54 Synchronization Messages .............................................
Application Example—Digital Input and Output at a Remote .........................................................73 10.6 dBm-Watts-Volts Conversion Chart ..............................74 Copyright Notice This Installation and Operation Guide and all software described herein are Copyright 2009 by GE MDS, LLC. All rights reserved. Microwave Data Systems Inc. reserves its right to correct any errors and omissions in this manual.
4. Installation, operation and maintenance of the transceiver should be in accordance with the transceiver's installation manual, and the National Electrical Code. 5. Tampering or replacement with non-factory components may adversely affect the safe use of the transceiver in hazardous locations, and may void the approval. 6. A power connector with screw-type retaining screws as supplied by MDS must be used. When installed in a Class I, Div.
1.0 ABOUT THIS MANUAL This manual presents installation and operating instructions of the MDS TransNET 900™ and MDS TransNET 2400™ transceivers for use by a professional installer. This person is expected to install, operate, and perform basic system maintenance on the described radio. Following installation, we suggest keeping this manual near the equipment for future reference. 2.0 PRODUCT DESCRIPTION The transceiver, shown in Figure 1, is a spread spectrum radio designed for license-free operation.
• 65,000 available network addresses • Network-wide configuration from the Master station eliminates most trips to Remote sites • Data transparency ensures compatibility with virtually all asynchronous SCADA system RTUs • Peak-hold RSSI averaged over eight hop cycles • Operation at up to 115,200 bps continuous data flow • Store-and-Forward repeater operation • Data latency typically less than 10 ms • Same hardware for Master or Remote configuration • Supports RS/EIA-232 and RS/EIA-485 user interface • Low c
devices. The operation of the radio system is transparent to the computer equipment. When used in this application, the transceiver provides an excellent alternative to traditional (licensed) MAS radio systems. Invisibleplaceholder MDS TransNET Remote RTU RXD RTU MDS TransNET Remote TXD C SYN PWR RXD TXD C SYN PWR MDS TransNET Remote RXD TXD C SYN RTU PWR MDS TransNET Master RXD RXD TXD TXD C SYN C SYN PWR RTU PWR MDS TransNET Remote Host System Figure 2.
TransNET radio links the outlying Remote site into the rest of a licensed MAS system by sending data from that site to an associated TransNET installed at one of the licensed Remote sites (see Figure 4). As the data from the outlying site is received at the licensed Remote site, it is transferred to the licensed radio (via a local cable connection) and is then transmitted to the MAS Master station in the usual manner. Additional details for tail-end links are given in Section 4.3 (Page 18).
2.5 Accessories The transceiver can be used with one or more of the accessories listed in Table 1. Contact the factory for ordering details. Table 1. Accessories Accessory Description MDS Part No. AC Power Adapter Small power supply module designed for continuous service. UL approved. Input: 120/220 Vac Output: 12 Vdc @ 500 mA (20 Watts) 01-3682A02 2-Pin DC Power Plug Mates with power connector on the transceiver. Screw terminals are provided for wires.
3.0 INSTALLATION PLANNING The installation of the radio is not difficult, but it does require some planning to ensure station reliability and efficiency. This section provides tips for selecting an appropriate site, choosing an antenna system, and reducing the chance of harmful interference. 3.1 General Requirements There are three main requirements for installing the radio—adequate and stable primary power, a good antenna system, and the compatible interface between the transceiver and the data device.
These requirements can be quickly determined in most cases. A possible exception is the last item—verifying that an unobstructed transmission path exists. Radio signals travel primarily by line-of-sight, and obstructions between the sending and receiving stations will affect system performance. If you are not familiar with the effects of terrain and other obstructions on radio transmission, the discussion below will provide helpful background.
With the hand-held antenna positioned near the proposed mounting spot, a technician can check for synchronization with the Master station (shown by a lit SYNC lamp on the front panel) and measure the reported RSSI value. If adequate signal strength cannot be obtained, it may be necessary to mount the station antennas higher, use higher gain antennas, or select a different site.
5. If constant interference is present in a particular frequency zone, it may be necessary to “lock out” that zone from the radio’s hopping pattern. The radio includes built-in tools to help users remove blocked frequency zones. Refer to the discussion of the SKIP command (Page 41) for more information. In the USA, a maximum of four zones may be skipped, per FCC rules. Check the regulatory requirements for your region. 6. Interference can also come from out-of-band RF sources such as paging systems.
Figure 7. Omnidirectional Antenna (mounted to mast) At Remote sites and point-to-point systems, a directional Yagi antenna (Figure 8), is generally recommended to minimize interference to and from other users. Antennas are available from a sources including MDS. Invisibleplaceholder Figure 8. Typical Yagi Antenna mounted to a mast Feedlines The choice of feedline used with the antenna should be carefully considered.
Table 2 lists several types of feedlines and indicates the signal losses (in dB) that result when using various lengths of each cable at 900 MHz and Table 3 for 2.4 GHz. The choice of cable will depend on the required length, cost considerations, and the amount of signal loss that can be tolerated. Table 2. Length vs. loss in coaxial cables at 900 MHz 10 Feet (3.05 Meters) 50 Feet (15.24 Meters) 100 Feet (30.48 Meters) 300 Feet (91.44 Meters) LMR 400 0.39 dB 1.95 dB 3.
Antenna Selection—Choose an antenna that offers a “DC ground” or direct low-impedance ground connection for all metallic components. This will allow static charges on the antenna system to be safely dissipated to ground. It will also provide a low-impedance discharge path to an earth/safety ground in the event of a direct lightning strike.
For convenience, Table 4 lists several antenna system gains and shows the maximum allowable power setting of the radio. Note that a gain of 6 dB or less entitles you to operate the radio at full power output—30 dBm (1 watt). Table 4. Antenna system gain vs.
4.0 INSTALLATION Figure 9 shows the contents of a typical transceiver shipment. Check the contents against the packing list secured to the outside of the shipping box. Accessories and spare parts kits, if any, are wrapped separately. Inspect all items for signs of damage and save all packing materials for possible re-shipment. Invisibleplaceholder MDS Xxxx MOUNTING BRACKETS INSTALLATION & OPERATION GUIDE, AND SOFTWARE (CD AND/OR MANUAL) 2-PIN POWER PLUG SPARE FUSE Figure 9.
choose a mounting location that provides easy access to the connectors on the end of the radio and an unobstructed view of the LED status indicators. Invisibleplaceholder 2.75 (7.0 cm) 6.63 (16.64 cm) 1.62 (4.15 cm) Figure 10. Transceiver Mounting Dimensions Figure 11 shows the four connectors on the transceiver and their functions. Invisibleplaceholder Antenna Data Primary Power (6–30 Vdc) Diagnostic (Payload) (Communications) Figure 11. Interface Connector Functions 2.
Typical RS/EIA-232 applications require the use of Pin 2 (receive data—RXD and Pin 3 (transmit data—TXD). Some systems may require the use of Pin 7 (Request-to-send—RTS). Figure 13 shows connection details for the DATA connector for EIA/RS-232 and EIA/RS-485, respectively. If hardware flow control is desired, Pin 7 (RTS) and Pin 8 (CTS) may also be connected. For a more detailed discussion of pin functions, see “Data Interface Connections (DB-9F)” on page 69.
CAUTION POSSIBLE EQUIPMENT DAMAGE The radio must be used only with negative-ground systems. Make sure the polarity of the power source is correct. The unit is protected from reverse polarity by an internal diode and fuse. Invisibleplaceholder Lead Binding Screws (2) Wire Ports (2) Figure 14.
b. Set a unique Network Address (1–65000) using ADDR command. Each radio in the system must have the same network address. Tip: Use the last four digits of the Master’s serial number to help avoid conflicts with other users. c. Set the baud rate/data interface parameters. Default setting is 9600 bps, 8 data bits, no parity, 1 stop bit.
DCE DB-9 RXD 3 3 TXD TXD 2 RXD 2 5 GND GND 7 RTS 4 If required. 8 CTS MDS TransNET 900 Remote Transceiver (DEVICE CTS KEY) MDS x710B Series Remote Transceiver (or device requiring keyline) DCE DB-25 Figure 15. Data Interface Cable Wiring for Tail-End Links Any device on the left that requires a keyline, as in this illustration, will require the bottom line (CTS to RTS) and the TransNET on the right will need DEVICE type set to CTS KEY. See DEVICE, on Page 32 for details. 4.
• Remote radio(s) transmitting data (TXD) and receiving data (RXD) with Master station Table 6.
Antenna SWR Check It is necessary to briefly key the transmitter for this check by placing the radio in the SETUP mode (Page 40) and using the KEY command. (To unkey the radio, enter DKEY; to disable the SETUP mode and return the radio to normal operation, enter Q or QUIT.) The SWR of the antenna system should be checked before the radio is put into regular service. For accurate readings, a wattmeter suited for 1000 MHz is required.
Baud Rate Setting The default baud rate setting is 19200 bps to accommodate most systems. If your system will use a different data rate, you should change the radio’s data interface speed using the BAUD xxxxx abc command (Page 29). It should be set to the highest speed that can be sent by the data equipment in the system. (The transceiver supports 300 to 115200 bps.) Radio Interference Checks The radio operates in eight frequency zones.
The TransNET Configuration Software provides access to all of the radio’s capabilities with the benefit of context-sensitive help. The program is shipped as part of the TransNET support CD included with every order (CD P/N 03-2708A02) 6.2 User Commands A series of tables begin on the next page that provide reference charts of various user commands for the transceiver. See “Detailed Command Descriptions” on Page 28 for more details.
Table 8. Network-Wide Diagnostics Command Description DLINK [xxxxx/ON/OFF] Details, page 32 Controls operation of diagnostic link function. DTYPE [NODE/ROOT] Details, page 33 Set radio’s operational characteristics for network-wide diagnostics Table 9.
Table 9.
Table 10. Operating Status—Display Only (Continued) Command Description ASENSE Details Page 29 Current sense of the alarm output. BAUD Details Page 29 Data communication parameters. Example: BAUD 9600 8N1 BUFF Details Page 30 Data buffering mode: ON = seamless data, OFF = fast byte throughput CODE Details Page 30 Security/encryption operational status.
Table 10. Operating Status—Display Only (Continued) Command Description REPEAT Details Page 38 The fixed downstream re-send count. RETRY Details Page 38 The maximum upstream re-send count for ARQ (Automatic Repeat Request) operation. RSSI Details Page 38 Received signal strength indicator (in dBm). Unavailable at Master unless SETUP is enabled.
Table 10. Operating Status—Display Only (Continued) Command Description XPRI Details Page 44 Address of the primary Extended radio unit (Extension). XMAP Details Page 44 Included Extended units in MODE X. (Extensions and Remotes only). XRSSI Details Page 44 Minimum RSSI level required to preserve synchronization with a non-primary radio. (Only meaningful when XPRI is not NONE) Table 11. Diagnostic and Test Functions Command Description KEY Details Page 35 Enables the transmitter test.
ADDR [1–65000] Network Address This command sets or displays the radio’s network address. The network address can range from 1 to 65000. A network address must be programmed at the time of installation and must be common across each radio in a given network. Radios are typically shipped with the network address unprogrammed, causing the address to display as NONE. If the address is not set (or is set to a wrong value) it leaves the system in an invalid state, preventing operation and generating an alarm.
The first parameter (xxxxx) is baud rate. Baud rate is specified in bits-per-second and must be one of the following speeds: 300, 600, 1200, 1800, 2400, 4800, 9600, 19200, 38400, 57600, or 115200. At baud rates of 19200 bps or less, the radio can support unlimited continuous data transmission at any hop rate. The second parameter of the BAUD command (abc) is a 3-character block indicating how the data is encoded.
Seamless mode (BUFF ON) is intended only for applications where the message size is 256 characters or less. Enforcement of this rule is left up to the user. If more than 256 characters are transmitted data delivery will not be seamless and data may be lost. Changes to the BUFF setting may only be made at the Master radio. This is because the Master radio broadcasts the buffer setting for the entire network.
For CTS Key operation (see the DEVICE command), the timer specifies how long to wait after asserting the CTS line before sending data out the DATA port. A timer value of zero means that data will be sent out the data port without imposing a key-up delay. (Other delays may be in effect from other radio operating parameters.
The following DLINK baud rates selections are supported: • 1200 • 4800 • 9600 • 38400 • 57600 • 115200 • 19200 (default) Example: DLINK 4800 sets the RJ-11 DIAG port to operate at 4800 bps when diagnostics is closed. This setting will not affect the port’s autobaud operation. Use only of DLINK ON, will enable the use 19200 or the most recently programmed value. The default is DLINK 19200 and DLINK ON. NOTE 1: The same baud rate must be entered into the InSite Equipment List’s BAUD field.
HOPTIME [7, 28] Radio Transmitter Hop Timing The HOPTIME command is used to set or display the hop-time setting. The command is a digit corresponding to the hop-time setting in milliseconds. The default HOPTIME setting is 7. A setting of 28 must be used when throughputs exceed 57,600 bps and is recommended when data transmission sizes exceed 256 bytes. Changes to the HOPTIME setting may only be made at the Master radio.
Table 12. INIT Command Generated Defaults (Continued) Parameter Corresponding Command Default Setting LED Operation OFF LED Low-Power Mode Hold 0 LPMHOLD RX Time-Out-Timer None/Disable RXTOT RF Output Power 30 dBm (1 watt) PWR 30 Transmitter Test Frequency 915.000 MHz or 2436.0 MHz (Model dependent) TX xxx Receiver Test Frequency 915.000 MHz 2436.
LED [ON, OFF] Enable/Disable PCB LEDs LED ON enables/disables the PCB board mounted LEDs seen only with the transceiver’s covers removed. LED is normally OFF, it may be useful to have them on for testing the radio with the covers removed. Note: the external LEDs will be dimmer if the LED function is left ON. The LED command also affects the operation of the LEDs in the “Low-Power Mode” (LPM). When LED is OFF, the radio keeps the PWR and SYNC LEDs extinguished.
All units default to Remotes; other modes must be specifically programmed with the MODE command. If MODE X is used, the MODE X radio should be programmed with an Extended Address (XADDR). Units that need to hear this MODE X radio must be programmed with an appropriate XPRI and/or XMAP value. MRSSI [NONE, –40...–90] Minimum RSSI for Mobile Operation The MRSSI command sets or displays the minimum RSSI level (dBm) of a Master station’s signal to maintain synchronization.
pass. Pin descriptions for EIA-232 are on page 69 and EIA-485 can be found on page 71. PWR [20–30] Radio Transmitter Power Level This command displays or sets the desired RF power output of the radio. The PWR command parameter is specified in dBm and can be adjusted in 1 dBm steps. The default setting is 30 dBm (1 watt) for the 900 MHz model and 27 dBm (0.5 watt) for the 2400 MHz model. To read the actual (measured) power output of the radio, use the SHOW PWR command.
For a Remote radio, under normal operation, RSSI is based on the average signal strength of the SYNC message received in each of the eight frequency zones. (RSSI is sampled each time a SYNC message is received.) When using the RSSI reading to align a directional antenna, it is important to make changes slowly so that the RSSI reading will provide meaningful results. It will take several seconds to indicate a change in signal level. The radio stays in RSSI mode until ENTER is pressed.
Entering a RXD ON (0 ms default) or RXD XX will enable the function. Entering RXD OFF will disable the function and erase any stored value. RXTOT [NONE, 0–1440] Receive Data Timeout-Timer This command sets or displays the amount of time (in minutes) to wait for the next received data packet before issuing a receiver time-out alarm. The default setting is NONE. SAF [ON, OFF] Store-and-Forward Services Support This command enables/disables the operation of the Store-and-Forward services.
SHOW CON Show Virtual Connection Status Shows virtual connection status established by the latest ATDT command sequence. (Works only with AT ON. See“AT [ON, OFF]” on Page 29) If no connection is established, it displays NONE. If a connection is active, it will display: TO . SHOW PWR Show Measured RF Transmit Power The SHOW PWR command displays the actual (measured) RF power output in dBm.
In the USA, a maximum of four zones may be skipped for TransNET 900 and a maximum of three zones may skipped for TransNET 2400. Check the regulatory requirements for your region. The SKIP function may not be permitted in your country and the radio will not respond to the SKIP command. Table 13. 900 MHz Frequency Skip Zones ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6 ZONE 7 ZONE 8 902.2 to 905.2 905.4 to 908.4 908.6 to 911.6 911.8 to 914.8 915.0 to 918.0 918.2 to 921.2 921.4 to 924.4 924.
A display of 06-4040A01, 3.6.1 is an example of the firmware version identifier—part number followed by release/version number. STAT Alarm Status This command is used to check the alarm status of the radio. If no alarms exist, the message NO ALARMS PRESENT is returned. If an alarm does exist, a two-digit alarm code (00–31) is displayed and the event is identified as a “Major” or “Minor” alarm. A brief description of the event is also given.
XADDR [0–31] Extended Address Used to display or program the Extended Address of this radio that will serve as a common address for the sub-network synchronized to this Master or Extension. This value can be listed in the XPRI parameter of associated Extension or Remote radios to allow them to synchronize to this radio. We recommend setting the Master to zero (0). It is easy to remember, and is the default address when the INIT command is used. (Programmed only in Master and Extension radios.
Historical information on the quality of each zone can be accessed using the ZONE DATA command. The report shows you the number of data frames sent, the number received, and the number received with errors. If an excessive number of errors are seen in one or more frequency zones, it may indicate interference, and you should consider “skipping” those zones using the SKIP command (See “SKIP [NONE, 1...8]” on Page 41). Note: If a frequency zone has been skipped, all counts for that zone will be zeros.
• Check for errors in the synchronization qualifiers, XPRI and XMAP, on corresponding Remote radios. • Verify SAF is enabled at the Master radio. 7.1 LED Indicators The LED status indicators are an important troubleshooting tool and should be checked whenever a problem is suspected. Table 17 describes the function of each status LED. Table 17.
With the exception of alarm code 00 (network address not programmed), major alarms generally indicate the need for factory repair. Contact MDS for further assistance. Minor alarms report conditions which, under most circumstances, will not prevent transceiver operation. This includes out-of-tolerance conditions, baud rate mismatches, etc. The cause of these alarms should be investigated and corrected to prevent system failure.
7.3 Troubleshooting Chart Table 19 provides suggestions for resolving system difficulties that may be experienced in the radio system. If problems persist, contact the factory for further assistance. Refer to the inside back cover of this guide for contact information. Table 19. Troubleshooting Guide Difficulty Recommended System Checks Unit is inoperative a.Check for the proper supply voltage at the power connector. Interference is suspected a.Verify that the system has a unique network address.
7.4 Performing Network-Wide Remote Diagnostics Diagnostics data from a Remote radio can be obtained by connecting a laptop or personal computer running MDS InSite diagnostics software (Version 6.6 or later) to any radio in the network. NOTE: The diagnostics feature may not be available in all radios. The ability to query and configure a radio via Network-wide Diagnostics is based on the feature options purchased in the radio being polled.
7.5 Internal Fuse Replacement The radio is protected by an internal fuse. This fuse can be blown by an over-voltage transient or an internal failure. Follow the procedure below to remove and replace the fuse: 1. Disconnect the primary power cable and all other connections to the unit. 2. Place the radio on its back and remove the four Phillips screws at the corners of the bottom cover. 3. Carefully separate the top and bottom covers.
8.0 RADIO FIRMWARE UPGRADES From time to time, Microwave Data Systems releases new firmware for its radio products. This file can be installed in existing radios to take advantage of engineering improvements or additional features. 8.1 Obtaining New Firmware The latest firmware for each radio type may be obtained free from our Web site at: www.MicrowaveData.com Registration is required to access the downloads area of the MDS Web site.
9.0 OPERATING PRINCIPLES AND CONFIGURATION 9.1 SAF Operation with Extension Radios The Store-and-Forward (SAF) capability operates by dividing a network into a vertical hierarchy of two or more sub-networks. (See Figure 5 on Page 4.) Adjacent sub-networks are connected via Extension radios operating in “MODE X” which move data from one sub-network to the next one. The Store-and-Forward implementation adheres to the general polling principles used in most multiple-address systems (MAS).
Extended SAF Network Below is an example of a multilevel network utilizing two repeaters—XJ,K and XK,L. The example demonstrates the extensibility of the network. In this case, messages directed to Remotes in the sub-network L will be relayed through Extension radios XJ,K and XK,L. Like the previous example, the Extension radios will split their operating time equally between their Master and Remote “personalities.
1. Mode X and M Radios—Can have direct reports (Mode R radios) outside of the chain. Data (Payload)—Travels from Master to Remote, and back from Remote to Master. Mode X and R Radios—Extension links can be protected by mapping one or more fall-back paths in case of a failure. Add secondary extension addresses (XADDR) into the XMAP table. (See “XMAP [00000000-FFFFFFFF]” on Page 44.) 2. 3.
All Remotes synchronize to a corresponding Master. This can be the “real Master” (the MODE M unit), or it can be a repeater “Extension” that derives synchronization from the “real Master.” Payload polls/packets broadcast from the network Master will be repeated to all levels of the network, either directly to Remotes, or through network repeaters—the Extension station. The targeted Remote responds to the poll following the same path back to the Master.
connections where wire lines were the only communications link available at the time. Most of these older system implemented support for the AT commands needed in the host software, so TransNET units can be used without software modifications. In this mode, the Master’s DATA port is parsed for a subset of AT commands. (See Supported Commands below).
AT Replies with ERROR (Code 4) Characters with Modem will echo characters in data stream but will be ignored until a second “AT” is seen at which time the modem closes the virtual connection. Operation Notes When AT Commands are ON • Radios will not poll with the embedded RTU simulator unless a connection is established. • Network-wide diagnostics are unaffected by the dialed unit connection status.
Table 21. Configuration Parameters for SAF Services Network Master Radio (Continued) Parameter Command Description Extended Address XADDR A number between 0 and 31 that will serve as a common address for radios that synchronize directly to this Master. Typically, the Master is set to zero (0). Details Page 44 Store-and-Forward Mode SAF ON Details Page 40 Enables store-and-forward capability in the network. Table 22.
Table 23. Configuration Parameters for SAF Services Remote Radio(s) Parameter Command Description Operating Mode MODE R Sets the radio to serve as a Remote station. Details Page 36 Network Address ADDR Details Page 29 Primary Extended Address XPRI Extension Map XMAP Details Page 44 Details Page 44 Extension Received Signal Strength Indicator XRSSI Details Page 44 A number between 1 and 65,000 that will serve as a common network address or name. Same number for all units in the same network.
It is important to note that power consumption will increase somewhat as communication from the Master station degrades. This is because the radio will spend a greater period of time “awake” looking for synchronization messages from the Master radio. In order for the radio to be controlled by Pin 4, the unit’s Sleep Mode must be enabled through the SLEEP [ON, OFF] command. See “SLEEP [ON, OFF]” on Page 42 for more information.
Reading RSSI and Other Parameters with LPM Enabled It may be desired to perform tests and review operational settings of a Remote radio which has been programmed to operate in the low-power mode. Follow the abbreviated procedure below to interact with the radio through a local computer. • Disconnect the Remote’s antenna to force it to lose sync with the Master • Power-down the radio • Connect a computer running TransNET configuration software to the Remote’s DIAG(nostic) port.
9.7 Low-Power Mode versus Remote’s Sleep Mode The Low-Power Mode (LPM) puts Remote radios into an operational configuration similar to Sleep, but there are some important differences. Below is a comparison of the two modes. Table 25.
Operational Influences—Hoptime & SAF The synchronization period is influenced by two parameters’ values—HOPTIME and SAF (Store-and-Forward). Table 26 shows several configurations and the associated synchronization period value. Table 26. Synchronization Period versus Hoptime and SAF Settings Sync Period Hoptime Value SAF 441 ms 7 OFF 1.8 sec 28 OFF 3.5 sec 28 ON 9.
in order to reduce the interference to the point where overload of one network by the other will not occur. The CSADDR command will provide relief from this antenna separation requirement by operating the networks in a TDD mode and ensuring that all Masters transmit at the same time to avoid interference. You might require up to 35 dB isolation between units.
must be capable of handling 1 Watt and have >25 dB isolation between TX ports. In some cases, up to 35 dB of isolation is required. Isolation is improved by adding attenuators between the TransNET radios and the splitters. Invisibleplaceholder Omnidirectional Antenna Network “A” Power Divider Master—Network “A” CS Master Network “B” (– 3 dB) Master—Network “B” CS Slave Figure 20. Co-Located Masters Sharing an Antenna 9.
The items described above provide sufficient security for a typical MAS system. For more highly-sensitive applications, system designers should consider employing application level encryption into their polling protocols to further protect their systems. Third party software tools are available for adding encryption, and these should be considered as part of any advanced encryption scheme. 10.0 TECHNICAL REFERENCE 10.
Data Rate: Data Latency: Byte Length: Maximum Data Transmission: 300, 600, 1200, 1800, 2400, 4800, 9600, 19200, 38400, 57600, 115200 bps asynchronous 7 ms typical 10 or 11 bits Continuous up to 115200 bps RF CHARACTERISTICS (TNC RF Connector) TRANSMITTER: Power Output (at antenna connector): Duty Cycle: Modulation Type: Output Impedance: Spurious: RECEIVER: Type: Sensitivity: Intermodulation: Desensitization: Spurious: Bandwidth: Interference Ratio (SINAD degraded by 3dB): Time Required to Synchronize wi
Primary Power: Current Draw (typical @ 27 dBm): Transmit: Receive: Sleep Mode (typical): Size: Weight: Case: Agency Approvals. 13.8 Vdc, Nominal (6–30 Vdc range) 510 mA @ 13.8 Vdc 100 mA @ 13.8 Vdc ≤ 3 mA @ 13.8 Vdc 5.30˝ W x 3.50˝ D x 1.40˝H (135 W x 89 D x 36 H mm). Weight: 1 Lb/0.5 k w/o brackets; 1.15 Lb / 0.52 k w/brackets 1 Lb / 0.5 k w/o brackets; 1.15 Lb / 0.
10.3 Diagnostic Interface Connections (RJ-11) Invisibleplaceholder DTE RJ-11 PLUG (TO RADIO) 1 6 RJ-11 PIN LAYOUT DTE DB-9 FEMALE (TO COMPUTER) 4 TXD RXD 2 5 RXD TXD 3 6 GND GND 5 Figure 21. RJ-11 to DB-9 Adapter Cable—Wiring Details NOTE: Only wire pins 4, 5, and 6. Pins 1,2, and 3 are reserved for special functions and are not normally connected. 10.
Pin Descriptions—RS/EIA-232 Mode Table 27 lists the DATA connector pin functions for radios configured to operate in RS/EIA-232 mode. NOTE: The radio is hard-wired as a DCE in the EIA-232 mode. Table 27. DATA connector pin descriptions—RS/EIA-232 Pin Number Input/ Output 1 OUT DCD (Data Carrier Detect) A “high” indicates hopping synchronization. 2 OUT RXD (Received Data) Supplies received data to the connected device. 3 IN TXD (Transmitted Data) Accepts TX data from the connected device.
Pin Descriptions—RS/EIA-422/485 Mode Table 28 lists the DATA connector pin functions for radios configured to operate in RS/EIA-422/485 mode. See Figure 23 for wiring schemes. Table 28. DATA connector pin descriptions—RS/EIA-485 Mode Pin Number Input/ Output 1 — 2 OUT 3 IN RXD+/RXA—Non-inverting receiver input. Accepts data from the connected device. 4 IN Sleep—A ground on this pin turns off most circuits in a Remote radio, including transmit, receive, modem, and diagnostic functions.
10.5 User Configurable I/O Connections Several connection points (eyelets) are provided within the transceiver near the DATA interface connector that allow the user to facilitate unique integration requirements. By jumpering eyelets, external functions (unconditioned I/O) may be communicated within the TransNET network using a Network Management System (NMS) such as MDS’ InSite or a user’s custom application that uses the Network-Wide Diagnostics Protocol.
Table 29. TransNET User I/O Connection Resources Function or Service Range Available at eyelet: Filtered Receive Audio (For test purposes) 0 – 5 Vac, 30–5 kHz H2 General Purpose I/O 1 (GPIO 1)a TTL; External 10K to 3.3 V Vcc Recommended H3 General Purpose I/O 2 (GPIO 2)b TTL; External 10K to 3.3 V Vcc Recommended H4 Analog 1c 0 – 5 Vac, ≤ 60 HZ H6 Do not connect. Factory use only.
10.6 dBm-Watts-Volts Conversion Chart Table 30 is provided as a convenience for determining the equivalent voltage or wattage of an RF power expressed in dBm with 50 Ohms load. Table 30. dBm-Watts-Volts Conversion Chart dBm V Po dBm V Po dBm mV +53 +50 +49 +48 +47 +46 +45 +44 +43 +42 +41 +40 +39 +38 +37 +36 +35 +34 +33 +32 +31 +30 +29 +28 +27 +26 +25 +24 +23 +22 +21 +20 +19 +18 +17 +16 +15 +14 +13 +12 +11 +10 +9 +8 +7 +6 +5 +4 +3 +2 +1 200W 100W 80W 64W 50W 40W 32W 25W 20W 16W 12.5W 10W 8W 6.
INDEX A Accessories (table) 5 ADDR command (set/display radio network address) 29 Alarm checking for 46 code definitions 47 codes 46 codes, table 47 major vs.
ADDR (set/display radio network address) 29 AMASK (configure alarm output signal) 29 ASENSE (set/display alarm output sense) 29 BAUD (set/display data interface port attributes) 29 BUFF (set/display received data handling mode) 30 CODE (set/display encryption value), See also Encryption 31 CTS (set/display CTS line response timer) 31 CTSHOLD (set/display CTS hold timer) 32 detailed descriptions 28–44 DEVICE (set/display DCE or CTS Key behavior) 32 display operating status 24 DKEY Command, Turn off radio tra
XPRI (display/program primary radio’s extended address) 44 XRSSI (sets minimum signal level for sync.
Downstream Repeat Transmission Count (REPEAT) Command 38 DSP (digital signal processing) 1, 47 DTYPE command (set radio’s diagnostics type) 33, 49, 50 E Enable internal RTU (RTU command) 39 network-wide diagnostics, procedures 49 Setup mode (SETUP command) 40 skipped zone (SKIP command) 41 Sleep Mode Enable/Disable LEDs (LED) Command 36 Encryption. See CODE command Equipment List 33 Extended Address Command (XADDR) 44 Extension radio.
feedline selection 10 performance optimization 20 requirements 6 site selection 6 site survey 7 tail-end links 18 transmission path 7 Interference about 8 checks 22 troubleshooting 48 interference 8 K Key set to CTS keying (DEVICE command) 32 transmitter, for antenna SWR check 21 KEY command (key transmitter) 21, 40 L LED status indicators table 20, 46 Low-Power Mode (LPM) Command 36 Low-Power Mode Sleep Time (LPMHOLD) Command 36 LPM Command (low-power mode) 36 LPMHOLD Command 36 M Map 44 Map of Extension A
procedures 49 Node (radio diagnostics type) 33, 50 O LED 36 Modbus, BUFF 30 Operation 19–22 OWM command (set/display optional owner’s message) 37 OWN command (set/display optional owner’s name) 37 Owner’s Message (OWM) Command 37 Owner’s Name Command (OWN) 37 P PC connecting to radio’s diagnostic port 49 launching InSite application at 49 performing diagnostics using connected 49 Peer (radio diagnostics type) 33, 50 Performance optimization 20 Pins, DATA INTERFACE connector descriptions (table) 70 Point-to-
Programming radio 28–44 as root or node 49 PWR command (set/display RF forward output power) 38 R Radio inoperative (troubleshooting chart) 48 no synchronization with master (troubleshooting chart) 48 poor performance (troubleshooting chart) 48 Radio Operating Mode (MODE) Command 36, 37 Radio Receive Test Frequency Command (RX) 39 Radio Serial Number Command (SER) 40 Radio Transmit Test Frequency (TX) 43 Radio Transmitter Hop Timing (HOPTIME) 34 Radio Transmitter Power Level (PWR) Command 38 Radio’s Interna
DCE or CTS Key device behavior (DEVICE command) 32 frequency zone to skip (SKIP command) 41 hoptime (HOPTIME command) 34 network address (ADDR command) 29 owner’s message (OWM command) 37 owner’s name (OWN command) 37 radio mode (see MODE command) 36 received data handling mode (BUFF command) 30 received data timeout value (RXTOT command) 40 receiver test frequency (RX command) 39 testing mode (SETUP command) 40 SETUP command (enter testing and setup mode) 40 Setup Radio Test (SETUP) 40 Show Clock-Synchroni
Temperature, display internal (TEMP command) 43 Terrain 7 Terrain and Signal Strength 7 Test, on-the-air 7 Transceiver connecting to data equipment 15, 22 default settings 34 mounting instructions/dimensions 14–15 performance optimization 20 sleep mode 59 Transceiver Sleep (SLEEP) 42 Troubleshooting 45–48 performing network-wide diagnostics 49 table 48 Turn Off Radio Transmitter Test Signal (DKEY) Command 33 Turn On Radio Transmitter Test Signal (KEY) Command 35 U UNIT Command (unit address) 43 Upstream Rep
x MDS TransNET Ref. Manual MDS 05-2708A01, Rev.
IN CASE OF DIFFICULTY... MDS products are designed for long life and trouble-free operation. However, this equipment, as with all electronic equipment, may have an occasional component failure. The following information will assist you in the event that servicing becomes necessary. TECHNICAL ASSISTANCE Technical assistance for MDS products is available from our Technical Support Department during business hours (8:00 A.M.–5:30 P.M. Eastern Time).
GE MDS, LLC 175 Science Parkway Rochester, NY 14620 General Business: +1 585 242-9600 FAX: +1 585 242-9620 Web: www.GEmds.
