Instruction manual

IMCB14-E1
i-3
CONTENTS
Page
1. OUTLINE ..............................................................................1
2. SPECIFICATIONS ................................................................2
3. WIRING.................................................................................3
4. COMMUNICATION SETTINGS............................................6
4.1 Communication Setting Mode .........................................................................6
4.2 Select Communication Parameters.................................................................7
4.3 Slave Address Setting .....................................................................................8
4.4 Communication Speed Setting......................................................................10
4.5 Data Configuration Setting ............................................................................12
4.6 Interval Time Setting .....................................................................................14
4.7 RS-485 Send/Receive Process Timing .........................................................17
5. MODBUS PROTOCOL.......................................................18
5.1 Message Format ...........................................................................................18
5.2 Function Code ...............................................................................................19
5.3 Communication Mode ...................................................................................19
5.4 Slave Response ............................................................................................20
5.5 Calculating CRC-16.......................................................................................21
6. MESSAGE FORMAT..........................................................23
6.1 Read Holding Registers [03H] .......................................................................23
6.2 Preset Single Registers [06H] .......................................................................24
6.3 Diagnostics (loopback test) [08H]..................................................................25