
CANplusTM CP750 MODBUS
Register Descriptions, Wiring and Configuration Manual
Revision B
Contents
1 Introduction .......................................................................................................................................................... 5
2 Important Safety Information ............................................................................................................................... 6
2.1 Autostart Warning .................................................................................................................................... 6
2.2 Telemetry Device Warning....................................................................................................................... 6
3 Wiring................................................................................................................................................................... 8
4 MODBUS Configuration ...................................................................................................................................... 9
4.1 Supported UART Modes .......................................................................................................................... 9
4.2 Multiple Register Access........................................................................................................................ 10
5 Coils................................................................................................................................................................... 12
5.1 Coil Function When in “MODBUS Monitor”............................................................................................ 12
5.2 Coil Function When in “MODBUS Full Control” ..................................................................................... 12
6 Discrete Inputs................................................................................................................................................... 14
7 Input Registers .................................................................................................................................................. 15
8 Holding Registers .............................................................................................................................................. 19
8.1 Auxiliary Output Modes .......................................................................................................................... 26
9 Example Operation............................................................................................................................................ 27
9.1 MODBUS Monitor .................................................................................................................................. 27
9.1.1 Starting an Engine Remotely .................................................................................................... 27
9.1.2 Stopping an Engine Remotely .................................................................................................. 27
9.1.3 Overriding Engine Speed .......................................................................................................... 27
9.2 MODBUS Full Control ............................................................................................................................ 28
9.2.1 Important ................................................................................................................................... 28
9.2.2 Starting an Engine Remotely .................................................................................................... 28
9.2.3 Stopping an Engine Remotely .................................................................................................. 29
9.2.4 Typical Ramp Profile ................................................................................................................. 29
9.3 Remotely Change Configuration............................................................................................................ 30
9.4 Configuring Auxiliary Output .................................................................................................................. 31
9.4.1 Activate Electrical Clutch at Specific Engine Speed ................................................................. 31
10 Troubleshooting................................................................................................................................................. 33
10.1 No Communication With Device ............................................................................................................ 33
10.1.1 Verify MODBUS Configuration.................................................................................................. 33