Omega A2400 manual Pinout

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Functional Description 2-3

Pinout

1) TRANSMIT This is the RS-232 Transmit output from the A2400. This pin is normally connected to the Receive input of a modem. This output is also used to connect to a terminal or computer to configure the A2400

2) RECEIVE This is the RS-232 Receive input of the A2400. This pin is normally connected to the Data Output of a radio modem. This input is also used to connect to a terminal or computer to configure the A2400

3) RTS RS-232 Request To Send output. This output is used to control the transmitter of the modem which allows multiple transmitters to exist on the same system. The RTS output is typically connected to the RTS input of the modem. The timing of the RTS signal is user-configurable with the T1, T2, T3 commands. The polarity of the RTS signal may be configured with the Setup (SU) command.

4) CTS This is the RS-232 Clear To Send input. Some modems provide a signal to indicate that the transmitter is ready after the RTS line has been asserted. This ready signal may be connected to the CTS input to provide a hardware handshake to provide a fast turn-around time. If the CTS line is not used, it may be left open and delay time T2 will function as a software handshake.

5) DO0/ARTS This is a digital output that can be configured to perform two functions. The function configuration is set by a bit in the Setup (SU) command. Normally this pin is configured as a general-purpose digital output. It may be turned on and off by commands from the host computer. The exact circuit schematic of the output is shown in Fig. 2.1. This circuit provides an output that is TTL and CMOS compatible. The diode in the circuit allows the collector to be pulled up to 30 volts to interface to relays and other higher-voltage devices. This output may also be configured as an Alternate Request To Send signal. With this setup, the ARTS signal exactly mimics the RTS output. This output may be used when a TTL signal is desired or a high- current open-collector signal is necessary.

6) DEFAULT* By grounding this pin, the A2400 is placed in a known communication setup. This is essential if the baud rate and address of the A2400 are not known. The default communications setup is: 300 baud, no parity, any address is recognized. The DEFAULT* pin should be grounded only if the A2400 is being setup or configured. In normal operation this pin is left open.

7) (Y)DATA+ This is the positive polarity signal of the differential RS-485

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Contents User’sGuide Servicing North America For immediate technical or application assistanceServicing Europe Revised 4/17/95 Omega Engineering ONE Omega DriveBOX STAMFORD, CT Phone 1-800-DAS-IEEETable of Contents Chapter Getting Started IntroductionSystem Overview Leased Lines$1RD +99999.99Default Mode Page Block Diagram Chapter Functional DescriptionFunctional Description Pinout RS-485 Termination A2400 OperationCharacter Filter Page Programmable Delay Times Page Command $1RD Response *+99999.99 Chapter CommunicationsDO, OC, CC, RD, REA, RID, RLP, RS, RSP, RSU Communication RS-485 Multidrop System DATA+Page Chapter A2400 Command Set Command StructureData Structure Write ProtectionMiscellaneous Protocol Notes Response StructureCommand Checksum Long Form Responses?1 Syntax Error ?1 BAD Checksum$1WEF A2400 User Commands A2400 Command Set RT3Command Descriptions Command 01CC Response Response *01CC11 Digital Output doCommand $1DO01 Response Command #1DO01 Response *1DO014F Closed Channel CC ExtendedCommand $1DO00 Response Command #1DO00 Response *1DO004E Extended Address EA$1ID Tank Farm #1ID Tank Farm1ID Tank Farm 1CD Command 01OC Response Response *01OCED Open Channel OC ExtendedRead Data RD $1RID Tank Farm#1RID 1RID Tank Farm 11F$1RSU #1RSU$1RSP #1RSPRead Time Delay 1 RT1 Response *1RT1+00100.00DC Read Time Delay 2 RT2Response *+00100.00 Page Page Short Prompt SP Command 01WE Response *01WE27 Error MessagesAddress Error BAD ChecksumCommand Error Parity ErrorSyntax Error Value ErrorChapter Setup Information/SetUp Command Command Syntax$1SUbyte 1byte 2byte 3byte Byte Byte 1 Ascii Printable Characters HEX AsciiParity Baud RateCommand $1RS Response *31070000 Command $1WE Response Command $1SU31020000Command $1RS Response *31020102 Command $1WE Command $1RR Response BitByte 2 Linefeed, Parity and Baud Rate BaudNormal addressing Chapter Delay Time Programming Delay Time Programming Page Command $1T3+00050.00 Set T3 to 50 ms Response Command $1RT1 Response *+00100.00Chapter Power Supply Chapter Troubleshooting Symptom RS-232 Module is not responding to commandsSymptom RS-485 Module is not responding to commands Command 01WE Response Open/Close Channel CommandsChapter Extended Addressing Typical system overview Command 01OC Response Command $1RD Response +00100.00 Typical $2RD +00123.45Command 01CC Response Command 02OC ResponseStructured Addressing Extended Address SyntaxOC and CC Command Formats Implied CC CommandImplied OC Command Command ResponseCommand Response *01OC1D Single Command Module Address Command 01$1RD Response *+00100.00Explicit Open and Close Channel Commands Command 01CC Response 01CC11 ‘11’ is the checksum Command 02OC Response 02OC1E ‘1E’ is the checksumChapter Transparent Mode Transparent Mode FunctionsA2400 interfacing a PLC to a leased-line modem A2400 networking several RS-232 devices to a host computer A2400 interfacing a laboratory instrument with modules Transparent Mode Adding secondary control using A2400 modules Transparent Mode WARRANTY/DISCLAIMER Shop online at omega.com
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