I-7021/22/24, M-7022/24/28 User Manual, Rev: B2.342.35 ~AA0 ............................................................................ 1212.36 ~AA1 ............................................................................ 1232.37 ~AA2 ............................................................................ 1252.38 ~AA3EVV.................................................................... 1272.39 ~AA4 ............................................................................ 1292.40 ~AA4 ............................................................................ 1312.41 ~AA4N ......................................................................... 1332.42 ~AA5 ............................................................................ 1352.43 ~AA5N ......................................................................... 1372.44 ~AA5PPSS ................................................................... 1392.45 @AABB ....................................................................... 1412.46 @AABBHH ................................................................. 1432.47 @AACECN.................................................................. 1452.48 @AADI ........................................................................ 1472.49 @AADODD ................................................................. 1492.50 @AARECN.................................................................. 1513. Modbus RTU Protocol .......................................................................... 1533.1 01 (0x01) Read Coils ..................................................... 1543.2 02 (0x02) Read Discrete Inputs ..................................... 1553.3 03 (0x03) Read Output Channels .................................. 1563.4 04 (0x04) Read Input Channels ..................................... 1573.5 05 (0x05) Write Single Coil........................................... 1583.6 06 (0x06) Write Single Register .................................... 1593.7 15 (0x0F) Write Multiple Coils ..................................... 1603.8 16 (0x10) Write Multiple Registers ............................... 1613.9 M-7022 Address Mappings ........................................... 1623.10 M-7024/M-7024L Address Mappings ......................... 1643.11 M-7024R Address Mappings ....................................... 1663.12 M-7024U Address Mappings....................................... 1693.13 M-7028 Address Mappings ......................................... 1734. Troubleshooting .................................................................................... 1754.1 Communicating with the module ................................... 176A. Appendix .............................................................................................. 177A.1 INIT Mode .................................................................... 177A.2 Dual Watchdog Operation ............................................ 179A.3 Module Output Status ................................................... 180A.4 Reset Status ................................................................... 181A.5 Analog Output ............................................................... 182