User Manual 805U-D Radio Modem ELPRO, 9/12 Billabong Street, Stafford Q 4053, Australia. Tel: +61 7 33528600 Fax: +61 7 33528677 Email: sales@elprotech.com Web: www.elprotech.
Contents Thank you for your selection of the 805U radio modem. We trust it will give you many years of valuable service. ATTENTION! Incorrect termination of supply wires may cause internal damage and will void warranty. To ensure your 805U enjoys a long life, double check ALL your connections with the user’s manual before turning the power on. Man_805U Rev 1.
805U Radio Modem Module User Manual WARNING 1. In some countries, a radio licence is not required for the 805U telemetry modules provided the module is installed using the antenna and equipment configuration prescribed. 2. Where a radio licence is not required, operation is authorised by the relevant Authority in your country on a non-protection basis. Although all care is taken in the design of these units, there is no responsibility taken for sources of external interference.
Contents How to Use This Manual To receive the maximum benefit from your 805U product, please read the Introduction, Installation and Operation chapters of this manual thoroughly before putting the 805U to work. Chapter Four Configuration details the configurations available and explains the diverse operation of the product in detail. Chapter Five Specifications details the features of the product and lists the standards to which the product is approved.
805U Radio Modem Module User Manual 3.6 CONTROLLED MODE ........................................................................................................... 21 3.6.1 Auto-Connect Controlled Mode ................................................................................. 24 3.6.2 Low Power Auto-Connect Mode ................................................................................ 24 3.6.3 Single-Connect Controlled Mode ....................................................................
Chapter One Chapter 1 Introduction INTRODUCTION 1.1 General The 805U radio modem module has been designed to provide flexible and reliable radio modem functions, at an economical price. Radio modems transmit serial data over a long distance via radio. The serial data is not changed - the output data is the same as the input data. Although the 805U is intended to be simple in its application, it also provides many sophisticated features.
805U Radio Modem Module User Manual transmitted equals the maximum message length (user configurable - default 530 bytes). If more than 530 bytes is input, the 805U unit will transmit the first 530 bytes, then the next 530 bytes, and so on until all of the data has been transmitted. Because the radio data rate could be less than the input serial data rate, an input memory buffer of 2Kbytes is provided. The RS232 connection provides CTS control to prevent the buffer overflowing.
Chapter One Introduction PLC 805U PLC PLC 805U PLC RS485 805U . 1.3 Controlled Mode “Controlled mode” provides “point-toHOST point” communications similar to telephone HOST NO DATA modems. In controlled mode, the flow of data is controlled by the 805U units. Each DATA #3 805U 805U unit is configured with an address by 805U the user, and a destination address for the #2 805U #1 data to be transmitted to.
805U Radio Modem Module User Manual In transparent mode, there can be an unlimited number of repeaters, however with some conditions (refer to Section 3.5). The repeater in transparent mode will repeat every transmission it receives. PLC 805U PLC PLC REPEATER PLC 805U RS485 805U In controlled mode, up to five repeaters may be configured for any transmission path. The repeaters are configured by address.
Chapter Two Chapter 2 2.1 Installation INSTALLATION General The 805U module is housed in an rugged aluminium case, suitable for DIN-rail mounting. Terminals will accept wires up to 2.5 sqmm in size. Normal 110-240V mains supply should not be connected to any terminal of the 805U module. Refer to Section 2.3 Power Supply. Before installing a new system, it is preferable to bench test the complete system. Configuration problems are easier to recognize when the system units are adjacent.
805U Radio Modem Module User Manual or RG213) terminated with a male SMA connector. The higher the antenna is mounted, the greater the transmission range will be, however as the length of coaxial cable increases so do cable losses. For use on unlicensed frequency channels, there are several types of antennas suitable for use. It is important antennas are chosen carefully to avoid contravening the maximum power limit on the unlicensed channel - if in doubt refer to an authorized service provider.
Chapter Two 2.2.2 Installation Yagi antennas. o A Yagi antenna provides high gain in the forward direction, but lower gain in other directions. This may be used to compensate for coaxial cable loss for installations with marginal radio path. The Yagi gain also acts on the receiver, so adding Yagi antennas at both ends of a link provides a double improvement. Yagi antennas are directional. That is, they have positive gain to the front of the antenna, but negative gain in other directions.
805U Radio Modem Module User Manual elements in a vertical plane (vertically polarized) or in a horizontal plane (horizontally polarized). For a two station installation, with both modules using Yagi antennas, horizontal polarization is recommended. If there are more than two stations transmitting to a common station, then the Yagi antennas should have vertical polarization, and the common (or “central” station should have a collinear (non-directional) antenna.
Chapter Two Installation 2.4.2 DB9 Connector Pinout Pin Name Direction Function 1 DCD Out Data carrier detect – - driven when link is established in controlled mode - driven always in transparent mode 2 RD Out Transmit Data – Serial Data Output 3 TD In Receive Data – Serial Data Input 4 DTR In Data Terminal Ready - DTR can be configured to initiate low power mode, or to force a link disconnection (“hang up” in controlled mode.
805U Radio Modem Module HOST User Manual 805U HOST RS485 CONNECTIONS HOST 805U HOST 120Ω DIP SWITCH FOR 120Ω SUPPLY RS485 RS232 - - 120 + + + RS485 CONNECTION USING TERMINATING RESISTOR Page 16 © April 2011
Chapter Three Operation Chapter 3 OPERATION 3.1 Power-up and Normal Operation When power is initially connected to the 805U module, the module will perform internal diagnostics to check its functions. The following table details the status of the indicating LEDs on the front panel under normal operating conditions.
805U Radio Modem Module User Manual When the 805U unit detects data in the input buffer, it initiates a radio message. The radio message will end when the number of transmitted bytes reaches the maximum message length (configurable by the user), or if the input buffer becomes empty. If the configured serial data rate is the same or more than the radio data rate, then data is transmitted as soon as it enters the input buffer - data “streams” from the input buffer to the radio port.
Chapter Three Operation At 19200 and 38400 bits/sec, the 805U adds forward error correction in the transmitted data. This is added automatically and is different to the configurable CRC error-check.. The radio range at 19200 baud is better than 38400 or 76800. The expected range at 38400 is 60% of maximum and at 76800 is 30%.
805U Radio Modem Module User Manual 3.4 Transparent Mode In transparent mode, radio messages are transmitted without unit addressing. Units do not provide handshaking functions to control the flow of data. Every unit which receives the radio message, and has the correct system and group addresses, will output the data. Transparent mode operation is effectively a broadcast system. Data received at the serial port is transmitted out of the radio port.
Chapter Three Operation Here is an example : Group Address Module A, B and C are configured as transparent repeaters. Module A is configured with group addresses 1 & 2, module B with group addresses 2 & 3 and module C with group addresses 3 & 4. First 1 2 3 Second 2 3 4 Repeaters A B C S Remote Modules T Z X Module S and T are 1 2 4 configured with group Group Address address 1 (only one group address as it is not configured as a repeater).
805U Radio Modem Module User Manual with a unit address - only the unit with an address matching the destination address of the radio message will process the message and output the serial data. To establish a link, the master will transmit a special “connect” message. This initial message will not include any data. If the “slave” unit receives the initial message, and is not already connected to another 805U unit, it will return an acknowledgment message.
Chapter Three Operation Successful Communications Source Module • Serial data is received • Serial RX LED flashes • Listen to ensure channel is clear • If clear, transmit message • Radio TX LED flashes Destination Module --------------> • • <-------------- • Radio RX LED flashes • Acknowledgment received okay communication complete Unsuccessful Communications Source Module • Listen to ensure channel is -------------> clear • Receive message • Radio RX LED flashes • Check system and
805U Radio Modem Module User Manual The time taken to transmit a message is :|------------HEADER-------------|--------------------DATA-----------|-----------| lead-in 10msec No. of bytes system unit repeater dest. zero address addr addrs's addr byte 2 1 0-5 1 1 data no. of data bytes error check 2 The time for each byte is 0.5msec @19200 bits/sec. If error checking is not configured at the receiving unit, data will start to be output approx 1msec after the "zero" byte has been received.
Chapter Three Operation module does not respond, then the link is not established and no data can be transferred. The module will not attempt to reconnect again until it receives another connect command from its host. The link is normally disconnected by the host issuing a disconnect command. In this mode, it is normal for a host to connect and disconnect to several slave modules using AT commands. A common example is a PC polling several analyzers or dataloggers.
805U Radio Modem Module User Manual Repeater Communications Successful Unit A Unit B Unit C Unit D Source Repeater Repeater Destination • ---> Transmit message • Receive message • Re-transmit message ---> • Receive message • Re-transmit message • Receive ACK • Re-transmit ACK Receive ACK <--- • Receive ACK • Re-transmit ACK <--- ---> • Receive message <--- • Transmit ACK • Output data Repeater units may also act as destination addresses for some transmissions and out
Chapter Three Operation message without an error-check, it will treat the last two data bytes as the error check - the errorcheck will always be incorrect and no data will be output. Error-check is strongly recommended for controlled mode operation. If error-check is not configured, then a 805U unit will transmit an acknowledgment message (ACK) whenever it receives a radio message, without checking for errors.
805U Radio Modem Module User Manual the normal radio level by mounting the antennas higher or in a better location. This not always possible. System performance may be improved by changing the following parameters :• If in transparent mode, try controlled mode. • If configured for a radio data rate of 76800 or 38400 bits/sec, reduce the rate to 19200 bits/sec. • If large radio messages are being transmitted, reduce the maximum message length, and transmit the data in more messages of smaller size.
Chapter Four Chapter 4 Configuration CONFIGURATION 4.1 Before Configuring Configuration comprises selecting parameter values for the operation of the 805U unit. Four pre-set configurations may be achieved using the four DIP switches. These configurations cover most applications - refer section 4.7. Before you start configuration, parameter settings must be decided. The main parameters are:• Addressing - system address, group address, unit address. • Character type.
805U Radio Modem Module User Manual In controlled mode, each module is also configured with a unit address between 0 and 127 there can be up to 128 modules in the one controlled mode system. In transparent mode, the unit address is used as the second group address for transparent repeaters. For modules not configured as a repeater, the unit address is ignored.
Chapter Four Configuration Reading and Configuring a module You will need a connection cable between the PC and the 805U. The cable should have straight-through connections as per section 2.4.1 of this manual. If your PC only has USB serial connections with no RS232 port, you will need to purchase a USB to RS232 converter cable. Select the communications port that you will be using on the PC - make sure that no other program is using this com port.
805U Radio Modem Module User Manual Transparent Repeater When you select a transparent repeater, the program will ask you to enter a second group address. The repeater will re-transmit messages from the first group to the second group - and from the second group to the first group. A transparent repeater will transmit data from its host device (if there is a host connected) using the first group address, and will only output data to its host device if the received message has the first group address.
Chapter Four Configuration At the master unit, you need to enter the address of the slave. Select the “Stored Add” page and “Dest1”. The address of the slave is entered into “Dest Add 1” and up to five repeater addresses may be entered. Repeater modules may be configured in any controlled mode option, but they must have the same system address. The repeater addresses are entered in order from the master that is, “Rpt 1” is the first repeater after the master.
805U Radio Modem Module User Manual link (DCD reset). If you enter an “Inactivity Timeout” value, then the 805U will automatically reset the link if there has been no data transmissions within this time. If you use the link check feature, you should enter an “Inactivity Timeout” value to reset the link at the slave unit. It is a good idea to use these timers as it provides a higher level of security for the controlled mode system (except for “fast operation” systems).
Chapter Four Configuration • After each message is transmitted, a 805U unit will not transmit another message during the transmit delay time. This could be used to allow a reply message to be received before the next message is sent. • After a message is received, a message will not be transmitted during the receive delay time. This could be used to delay a reply message until other messages have been sent. Serial Port settings The serial port settings should be selected to match the host device.
805U Radio Modem Module User Manual DTR Control • The DTR signal on the RS232 port can be used for different functions in controlled mode: • “Ignore DTR” - the DTR signal does not perform any function • “Command Mode” - if the host resets DTR, the 805U will go into command mode - when DTR is activated, the module will revert to on-line mode • “Command Mode, Disconnect” - as above except that the module will also force a disconnection of the communications link • “Low Power, Disconnect” - when the
Chapter Four Configuration 4.5 Hayes Commands The 805U unit may be configured by a host device using Hayes AT commands. Configuration may be done “off-line” by a user (with a PC terminal as the host device) or it can be done automatically “on-line” by a host device such as PLC or SCADA. The AT commands are ASCII messages designed for use with conventional telephone modems. Before a 805U unit will accept Hayes commands, it must be in “command” mode.
805U Radio Modem Module User Manual Configuration of Data Rates and Character Type ATB Radio Baud Rate The radio rate must be the same in all modules B0 19,200 baud (default) B2 B1 38,400 baud ATC Serial Baud Rate 76,800 baud The serial rate can be different in different modules.
Chapter Four Configuration AT&Z0=33,34,35,5 will store an address sequence, where 5 is the destination address and 33, 34 and 35 are repeater addresses. The first repeater will be 33. The 805U master will attempt to connect to the destination address (slave). If the module cannot connect, or if communications fails, the module will continually send “connect” messages to make a connection.
805U Radio Modem Module User Manual Either host may disconnect the link using the ATH command - or by using the DTR signal on the RS232 port - refer to the AT&D command in Appendix A. When the link is disconnected for any reason, the DCD output at each module is reset and each module will respond to its host with NO CARRIER - each module will revert to command mode. Fast Operation Mode Not used.
Chapter Four Configuration View Configuration The AT&V command will output to the terminal a listing of all configuration settings. AT&V Show all settings including S registers &V0 Same as AT&V &V1 Only show settings that are different from the defaults. Transmit and Receive Hold-off times Transmit holdoff ATS16=x where x is the delay time in msec (0 – 255) For example, ATS16=200 results in a transmit holdoff delay of 200msec.
805U Radio Modem Module User Manual 4.6 Configuration Examples Transparent Mode Extending a PLC Network PLC PLC PLC PLC RS485 9.6KB RS485 38.4KB 805U 19.2KB 805U 19.2KB RS485 9.6KB 805U REPEATER DATA = 7 DATA BITS, 1 START, 2 STOP, EVEN PARITY Left-hand Unit Configuration Set the module to factory default settings: AT&F Set the system address to a random number: AT&S138 Set the group address AT&G1 The group address for the left hand side modules has been set to 1.
Chapter Four Configuration Set the serial data rate to 9600 ATC4 Set the radio data rate to 19200 not necessary (default) Set the character type to 7,1,2,even AT&B13 Set the operating mode to Transparent Repeater AT&M1&L1 Exit and save the configuration AT&W ATO Right-hand Unit Configuration Set the system address to the same random number: AT&S138 Set the group address AT&G2 Set the serial data rate to 9600 ATC4 Set the radio data rate to 19200 not necessary (default) Set the character
805U Radio Modem Module User Manual Module #2 Set the module to factory default settings: AT&F Set the system address to the same random number: AT&S217 Set the unit address to 2 AT&U2 Set the operating mode to controlled mode AT&M2&L3 Note that this module can be configured as any controlled mode, except for fast operation.
Chapter Four Configuration Note that these switch settings do not set the system or group addressing - this still needs to be set by Hayes Commands or the configuration program. The four switches are located on the top end-plate, as per this diagram. If you look at the end of the module with the front of the module up, then Switch 1 is the left-most switch, and “on” or 1 is when the switch is down. The switches in the diagram have the pattern 0100. Switch Function Equivalent Hayes Command at start-up.
805U Radio Modem Module User Manual Chapter 5 SPECIFICATIONS General EMC specification EN 300 683 89/336/EEC Radio specification EN-300-220/1 869.4 – 869.65 MHz, 500mW Housing 110 x 185 x 30mm DIN rail mount Powder-coated, extruded aluminium Terminal blocks Removable Suitable for 2.
Chapter Five Specifications Serial Ports RS232 Port DB9 female DCE RTS/CTS/DTR/DCD hardware signals provided RS485 Port 2 pin terminal block Typical distance 1.
805U Radio Modem Module Chapter 6 User Manual TROUBLESHOOTING 6.
Chapter Six &T2 Troubleshooting Transmit & Receive BER Test. Used with a second module configured as a transparent repeater. &T3 RSSI Measurement. Monitors the received signal strength, and displays in dBm. Most radio tests are carried out using the AT&T2 test as this is the easiest to accomplish. AT&T3 - Received Signal Strength Display This option provides for testing the radio path between two 805U units.
805U Radio Modem Module 6.2.2 User Manual Bit Error Rate Test (BER) BER may be tested in one direction by typing AT&T0 (BER master) at the sending unit and typing AT&T1 (BER slave) at the receiving unit. The sending unit will repeatedly send pseudo-random frames, and the receiving unit will check these frames for errors. If a terminal is connected to the sending unit, the pseudo-random data is displayed as it is transmitted.
Chapter Seven Chapter 7 Warranty and Service WARRANTY & SERVICE We are pleased that you have purchased this product. ELPRO products are warranted to be free from manufacturing defects for a period of 12 months from the effective date of purchase by the end user. The effective date of purchase is decided solely by ELPRO Technologies.
805U Radio Modem Module User Manual Appendix A Hayes Commands The following details all of the Hayes commands supported by the 805U. Default settings are shown by a “dot”, • Command Function ATA Answer Incoming Connection message in controlled mode – the module can also be set to answer incoming connections immediately or after a certain number of attempts (see S-Register S0) - the default for S0 is 1, meaning that the module will normally automatically answer on the first connection attempt.
Appendix A Hayes Commands ATSn=xx Set value of S-Register n to xx ATV Verbal/Numeric Response Codes V0 Numeric response codes V1• Verbose response codes ATX Extended Response Codes. Allows more detailed response codes, including connection speed. X0• Basic response codes only X1 X0 + Connection Baud rate codes (CONNECT 19200, CONNECT 38400) X2 X1 + BUSY Message X3 X2 + RINGING Message ATZ AT&Bxx Reset the module, and re-load the configuration stored in non-volatile memory.
805U Radio Modem Module AT&K User Manual Flow Control Configuration. &K0 Flow Control Disabled. CTS Always high. Module ignores RTS. &K1 not used &K2 not used &K3 CTS/RTS Flow Control. CTS Reflects the state of the local buffer. Module only transmits serial data when RTS is high. &K4• RS-485 Control. Must be selected for RS-485 to work. CTS is high. CTS goes low when transmitting data. RTS is ignored. AT&L Configuration of start-up mode, and controlled mode operation.
Appendix A Hayes Commands &T1 Receive Bit Error Rate Test. Receives data from &T0 module, and records BER statistics. &T2 Transmit & Receive BER Test. Used with a second module configured as a transparent repeater. &T3 RSSI Measurement. Monitors the received signal strength, and displays in dBm. AT&V View Current Configuration – List the value of all settings as well as S-Registers. &V0 Same as AT&V &V1 Only show settings that are different from the defaults.
805U Radio Modem Module User Manual set less than the timeout set by the AT\T command. Default 0. S7 1-255 Number of Connection attempts How many times to attempt a connection after an ATD command. Default 5. S8 0-255 Test Timer Units Seconds – How long to run tests (AT&Tx). Default 0 (no time-out).
Appendix A Hayes Commands RB is radio baud Rate, (in bits per second) TD is transmit delay (0.008) MP is the maximum packet size to be transferred NB is the maximum number of bit times delay allowed between characters in the protocol. S19 is calculated as S19 = 1000 * (NB/SB) (Rounded up) Response Codes Response codes display the status of the module in response to user commands. The response code displayed depends on the ATV setting, the ATX setting and the ATQ setting.
