Omega A2400 manual $1RD, +99999.99

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Getting Started 1-3

Getting Started

To get your A2400 up and running for an initial check-out, connect the unit to a power supply and terminal as shown in Figure 1.2. The power supply can be any dc source from 10 to 30 volts, capable of 1 Watt of power. The terminal can be any RS-232 dumb terminal set for 300 baud. A computer configured as a terminal can also be used. Be sure to ground the DEFAULT* pin.

Figure 1.2 A2400 Quick Hookup.

After checking the connections, power up the A2400. Type the following command on the terminal:

$1RD

Make sure to use upper case characters for the ‘RD’ (Read Data) command and terminate the command with a carriage return. The A2400 should reply with the message:

*+99999.99

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Contents User’sGuide For immediate technical or application assistance Servicing North AmericaServicing Europe STAMFORD, CT Phone 1-800-DAS-IEEE Revised 4/17/95Omega Engineering ONE Omega Drive BOX Table of Contents Introduction Chapter Getting StartedLeased Lines System Overview+99999.99 $1RDDefault Mode Page Chapter Functional Description Block DiagramFunctional Description Pinout A2400 Operation RS-485 TerminationCharacter Filter Page Programmable Delay Times Page Chapter Communications Command $1RD Response *+99999.99DO, OC, CC, RD, REA, RID, RLP, RS, RSP, RSU Communication DATA+ RS-485 Multidrop SystemPage Command Structure Chapter A2400 Command SetResponse Structure Data StructureWrite Protection Miscellaneous Protocol NotesLong Form Responses Command Checksum?1 BAD Checksum ?1 Syntax Error$1WEF A2400 User Commands RT3 A2400 Command SetClosed Channel CC Extended Command DescriptionsCommand 01CC Response Response *01CC11 Digital Output do Command $1DO01 Response Command #1DO01 Response *1DO014FExtended Address EA Command $1DO00 Response Command #1DO00 Response *1DO004E#1ID Tank Farm $1ID Tank Farm1ID Tank Farm 1CD Open Channel OC Extended Command 01OC Response Response *01OCEDRead Data RD 1RID Tank Farm 11F $1RIDTank Farm #1RID#1RSP $1RSU#1RSU $1RSPResponse *1RT1+00100.00DC Read Time Delay 2 RT2 Read Time Delay 1 RT1Response *+00100.00 Page Page Short Prompt SP BAD Checksum Command 01WE Response *01WE27Error Messages Address ErrorValue Error Command ErrorParity Error Syntax ErrorCommand Syntax Chapter Setup Information/SetUp Command$1SUbyte 1byte 2byte 3byte Byte HEX Ascii Byte 1 Ascii Printable CharactersBaud Rate ParityCommand $1WE Response Command $1SU31020000 Command $1RS Response *31070000Command $1RS Response *31020102 Command $1WE Baud Command $1RR ResponseBit Byte 2 Linefeed, Parity and Baud RateNormal addressing Chapter Delay Time Programming Delay Time Programming Page Command $1RT1 Response *+00100.00 Command $1T3+00050.00 Set T3 to 50 ms ResponseChapter Power Supply Symptom RS-232 Module is not responding to commands Chapter TroubleshootingSymptom RS-485 Module is not responding to commands Open/Close Channel Commands Command 01WE ResponseChapter Extended Addressing Typical system overview Command 02OC Response Command 01OC ResponseCommand $1RD Response +00100.00 Typical $2RD +00123.45 Command 01CC ResponseExtended Address Syntax Structured AddressingCommand Response OC and CC Command FormatsImplied CC Command Implied OC CommandCommand 01$1RD Response *+00100.00 Command Response *01OC1D Single Command Module AddressExplicit Open and Close Channel Commands Command 02OC Response 02OC1E ‘1E’ is the checksum Command 01CC Response 01CC11 ‘11’ is the checksumTransparent Mode Functions Chapter Transparent ModeA2400 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