Preliminary Release Model 2788 MAS Ethernet/RS-232 UHF Radio Transceiver Technical Manual Alligator Communications Model 2788 Technical Manual REV2.
Preliminary Release REVISION HISTORY REV 1 DESCRIPTION Initial Release Alligator Communications Model 2788 Technical Manual REV2.
Preliminary Release Paragraph 1. Contents Page 5 1.1 General Description5 1.2 Applications5 1.3 Technical Specifications6 1.4 Warranty8 1.5 Claims for damage in shipment8 1.6 Information to user, as required by FCC section 15.219 1.7 RF exposure information9 2.0 Radio Configuration and Operational Check10 2.1 General Discussion10 2.2 Operational Bench Test10 2.2.1 Antenna Connector10 2.2.2 Power Connector11 2.2.3 Initial Checkout11 3.0 Field Configuration and Verification15 3.1 15 4.
Preliminary Release 5.14 Log-in Session Activity Timer20 5.15 Enable Transmitter21 5.16 Enable Encryption21 5.17 Enable Password Entry21 5.18 ID (Identification Number)21 5.19 Password21 5.20 ES Encryption Phrase21 5.21 Log Out22 5.22 Quit Telnet22 5.23 Forwarding Mode22 5.24 Remote RTU0 MAC Address22 5.25 Remote RTU1 MAC Address23 5.26 Master RTU MAC Address Table23 5.27 Host MAC Address Table23 5.28 High QOS (Quality Of Service) IP Address Table23 5.29 Loopback Remote MAC Address24 5.
Preliminary Release Introduction Thank you for purchasing the Alligator Model 2788 UHF Radio Transceiver. We are here to assist you personally should any questions arise in the installation or operation of this product. Please feel free to call us. We look forward to your feedback and will strive to make our product as compliant with your specific needs as possible. 1.
Preliminary Release 1.3 Technical Specifications GENERAL Frequency 757-758 MHz Input Voltage 10-24 Vdc Current Consumption (at 13.8 Vdc) <80 mA Receive Mode 100 mA Transmit Mode (0.2 Watts) < 0.5 A Data Rate 9600 bps to 38.4 kbps Connectors Antenna Type N female Power 2-pin Captive, Rectangular Data (RS-232) DB9F Environment Temperature -30°C to +50°C Humidity 95% at 40°C Dimensions 6.75” x 1.5” x 5.75” Weight 2 pounds Alligator Communications Model 2788 Technical Manual REV2.
Preliminary Release TRANSMITTER RF Power 2W Impedance 50 Ohms Frequency Range 757-758 MHz Frequency Step Size 1 Hz Frequency Stability ±1 ppm Modulation 4GFSK Symbol Rate 4800 Hz** Data Rate 9600 bps Maximum Frequency Deviation 2400 Hz** Attack Time <1 msec Release Time <0.5 msec Bandwidth 6.25, 12.
Preliminary Release deviation 1.4 Warranty Alligator Communications, Inc., warrants each of the instruments of its manufacture to meet the specifications when delivered to the BUYER; and to be free from defects in material and workmanship. Alligator Communications will repair or replace, at its expense, for a period of one year from the date of delivery of equipment, any parts that are defective from faulty material or poor workmanship.
Preliminary Release Website: www.alligatorcom.com 1.6 Information to user, as required by FCC section 15.21 Changes or modifications not expressly approved in writing by Alligator Communications, Inc. may void the user’s authority to operate this equipment. In accordance with FCC Rules Section 15.21, the user of this equipment is advised that changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. 1.
Preliminary Release 2.0 Radio Configuration and Operational Check 2.1 General Discussion Prior to customer installation and electrical connection of the customer’s terminal equipment to the 2788 radio, it is recommended that the installing technician conduct a brief operational checkout of the 2788 radio and confirm that all operating parameters are set as desired.
Preliminary Release 2.2.2 Power Connector The DC power input connector to the 2788 radio is a rectangular two-pin locking connector. The radio unit is normally powered upon connection to a DC power source of +11 to +24 Vdc, +13.8 Vdc (nominal). The red conductor is positive; the black conductor is negative and is internally grounded to the chassis. 2.2.
Preliminary Release 6. Download a Telnet client program for use on your lap-top such as puTTY. Configure puTTY to communicate to the 2788 on its IP address. The normal default IP address and port for the 2788 is 192.168.1.128 port 23. Below shows a typical puTTY configuration for communicating with the 2788 on IP default address 192.168.1.128 port 23. Be sure to have your computer IP address set in the subnet range. puTTY should have Terminal set for local echo on.
Preliminary Release 7. Open a Telnet session with the 2788. You should get a menu showing the current 2788 status and configuration (Fig. 2). You may end a Telnet session at any time by entering q. The menu can be re-displayed by either entering or . Alligator Communications Model 2788 Technical Manual REV2.
Preliminary Release 8. Set the desired transmitter frequency. For example, tf=757.0950.0. 9. Set the desired receiver frequency. For example, rf=787.0940.0. 10. Set the desired transmit power. For example, tp=1. 11. Use the dt=1 command to activate the transmitter carrier in CW mode to confirm frequency and RF level on a spectrum analyzer. You will have 120 seconds before the anti-streaming timer expires and deactivates the CW carrier.
Preliminary Release 3.0 Field Configuration and Verification Prior to field installation of the 2788, it is crucial that that bench configuration and testing be done using cables and RF attenuators to duplicate the deployed system or subsystem. This adds confidence that the configuration has been done properly and stream-lines field installation. Each remote configured 2788 must be tested with a master configured 2788 to verify proper operation.
Preliminary Release mode forwards all packets (known as promiscuous packet forwarding mode). This mode is only recommended for small systems and testing. The recommended mode is fm=1 (host mode forwarding). In this mode a master radio will only forward packets with a tabulated host source MAC address. A remote radio in host forwarding mode only forwards packets with a tabulated host destination MAC address. Up to 16 addresses can be stored in the 2788 remote or master radio.
Preliminary Release 14. The 2788 can operate using the AES256 encryption standard with the following commands: ee=0 no encryption ee=1 AES256 encryption No encryption results in the least number of extra characters appended to a message. This minimizes transmission latency. Encryption will pad extra randomized characters to create standardized message segment lengths of 128 bits. The pad characters are removed at the receiver. The AES256 standard uses a 256-bit key.
Preliminary Release 5.0 User Configuration and Diagnostic Menu The 2788 uses a simple command line interface for configuring and monitoring key parameters and metrics. Access is via IP Telnet. The 2788 is set to a default IP address of 192.168.1.128 at time of shipment. The access is either local, using the Ethernet RJ-45 connector or remote through the radio system. The command line interface facilitates writing scripts for automated configuration.
Preliminary Release 5.4 Transmit Power The 2788 transmitter output power has three power settings: 1 = Low (0.5 W); 2 = Mid (1 W) ; 3 = Hi (2 W) tp=x Examples: tp=1 ; tp=2 ; tp=3 5.5 Operational Mode The 2788 has two operational modes: 0 Remote 1 Master Systems can be configured for single or dual frequency. No advantage in latency is gained by using two channel frequencies. Systems use 1 master (om=1) and up to 512 remotes (om=0).
Preliminary Release Examples: tnp=23; tnp=1000 ; tnp=65535 5.9 Gateway Address The 2788 must be given the gateway router IP address within its LAN subnet group. Normally it is the first IP subnet address ending in 1. gw=###.###.###.### Examples: gw=10.0.0.1; gw=172.16.10.1; gw=192.168.1.1 5.10 Subnet Mask The 2788 must be given a subnet mask. The default is 255.255.0.0 sm=###.###.###.### Examples: sm=255.255.0.0 ; sm=255.255.255.0 5.
Preliminary Release lgt=#### Examples: lgt=300; lgt=9999 5.15 Enable Transmitter The 2788 transmitter can be enabled for normal operation or forced to be disabled by this command. et=# 0 = disable transmitter 1 = enable normal transmitter operation Examples: et=0 ; et=1 5.16 Enable Encryption The 2788 can encrypt data for additional data security. This command selects encryption. ee=# 0 = disable encryption 1 = enable AES256 encryption Examples: ee=0 ; ee=1 5.
Preliminary Release aesp=###. . .### Examples: aesp= ; aesp=mydoghasfleas 5.21 Log Out When password entry is enabled (ep=1) after a session is complete, the user logs out using the command: lo (lower case L lower case O) If the lo is not entered, then the session timer will automatically perform the log out after timing out. 5.22 Quit Telnet To quit a Telnet session: q 5.
Preliminary Release 5.25 Remote RTU1 MAC Address This is the RTU1 MAC hexadecimal address of the second RTU connected to a remote 2788. It is stored at the remote 2788 and is used when the remote radio is in forwarding mode 0 or 2. rtu1=##-##-##-##-##-## Example: 01-23-de-ad-be-ef 5.26 Master RTU MAC Address Table This is the command format for entering RTU hexadecimal addresses in the master radio RTU table. It is used when the master is in forwarding mode 0 or 2.
Preliminary Release 5.29 Loopback Remote MAC Address This is the remote radio hexadecimal MAC address placed in the master radio when performing the loopback diagnostic test (dt=5). Note that Alligator 2788 radios are currently assigned to MAC addresses starting with 70-b3-d5-9c-e. lb=##-##-##-##-##-## Example: lb=70-b3-d5-9c-e0-00 5.
Preliminary Release 5.31 Display Status Screen The status screen is displayed by two methods: a single press of the escape key a double press of the carriage return (ENTER key) 5.32 Display RTU Table The entire 512-entry RTU table is displayed: rtutable 5.33 Display Host Table The entire 16-entry host table is displayed: hosttable 5.34 Display QIP Table The entire 16-entry QIP table is displayed: qiptable Alligator Communications Model 2788 Technical Manual REV2.
Preliminary Release 6.0 Theory of Operation The 2788 concurrently operates transparently using two communication interfaces: Ethernet and RS-232 (Fig. 1). The 2788 encapsulates any protocol in a proprietary Alligator format to encrypt and forward multiple packet fragments across a UHF radio link and reassemble them seamlessly. It is most easily understood as a wire transmission with added latency due to time taken for transmission over a 12.
Preliminary Release MAC table are forwarded. The remote radio can also be configured for RTU filtering. This causes the remote radio to forward only packets back over the RF link when they are sourced by an authorized source RTU MAC address. This also greatly reduces the probability of system flooding. The combined RTU and Host screening mode provides the greatest amount of filtering.
Preliminary Release RTU#1 Internet Master Radio Bastion Host Compute r Diagnos tic Comput er Remot e Radio RTU#2 Etherne t LAN Etherne t LAN Figure 1 2788 Typical SCADA Block Diagram Alligator Communications Model 2788 Technical Manual REV2.
Preliminary Release Figure 2 2788 User Line Commands Alligator Communications Model 2788 Technical Manual REV2.
Preliminary Release Model 2788 Internal Reset Push Button Location Alligator Communications Model 2788 Technical Manual REV2.
FCC Statement 1. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference. (2) This device must accept any interference received, including interference that may cause undesired operation. 2. Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.
