Teledyne 7600 - Infrared gas analyzer - communication manual - Manual (Page 2)

Teledyne Analytical Instruments
2
CONTENTS
1. COMMUNICATION FUNCTIONS ...............................................…...........................3
1.1 General..............................................................................................................3
2. SPECIFICATIONS..........................................................................................................4
2.1 Communication specifications...........................................................................4
3. CONNECTION................................................................................................................5
3.1 Terminal allocation ..............................................................….........................5
3.2 Connection ...................................................................….................................5
4. SETTING OF COMMUNICATION CONDITION........................................................6
4.1 Set items.........................…................................................................................6
4.2 Setting operation................................................................................................6
5. MODBUS COMMUNICATION PROTOCOL..............................................................7
5.1 General...............................................................................................................7
5.2 Composition of message....................................................................................8
5.3 Response of slave station.................................................................................10
5.4 Function code...................................................................................................11
5.5 Calculation of error check code (CRC-16) ...................…..............................12
5.6 Transmission control procedure.......................................................................14
6. DETAILS OF MESSAGE ............................................................................................16
6.1 Read-out of word data [Function code:03H] ..................................................16
6.2 Read-out of read only word data [Function code:04H]...................................18
6.3 Write-in of word data (1 word) [Function code:06H].................…................20
6.4 Write-in of continuous word data [Function code:10H] ...........…..................21
7. ADDRESS MAP AND DATA FORMAT....................................................................23
7.1 Data format .......................................…..........................................................23
7.2 Address map ................................................…................................................25
7.3 Supplement to address map ............................................................................34
8. SAMPLE PROGRAM ................................................…..............................................36
9. TROUBLESHOOTING.................................................................................................42