IMR01J08-E1
i-3
CONTENTS
Page
1. OUTLINE............................................................................... 1
2. SPECIFICATIONS ................................................................ 2
3. WIRING ................................................................................. 4
4. SETTING............................................................................... 6
4.1 Transfer to Communication Setting Mode .......................................................6
4.2 Setting the Communication Parameters ..........................................................7
4.3 Communication Requirements ......................................................................11
5. RKC COMMUNICATION PROTOCOL............................... 13
5.1 Polling............................................................................................................13
5.1.1 Polling procedures ............................................................................................. 14
5.1.2 Polling procedure example................................................................................. 17
5.2 Selecting........................................................................................................18
5.2.1 Selecting procedures ......................................................................................... 18
5.2.2 Selecting procedure example............................................................................. 21
5.3 Communication Identifier List ........................................................................22
6. MODBUS COMMUNICATION PROTOCOL....................... 31
6.1 Message Format............................................................................................31
6.2 Function Code ...............................................................................................32
6.3 Communication Mode....................................................................................32
6.4 Slave Response ............................................................................................33
6.5 Calculating CRC-16.......................................................................................34
6.6 Message Format............................................................................................36
6.6.1 Read holding registers [03H].............................................................................. 36
6.6.2 Preset single resister [06H] ................................................................................ 37
6.6.3 Diagnostics (loopback test) [08H] ...................................................................... 38
