CLIMET INSTRUMENTS CI-154 - Modbus Communication Protocols

8. Appendix
8.1 Legacy Modbus coils
The following list provides coil write examples for the following coils in the unit.
Note that Modbus coil numbers are offset from the address by 1. These have been
replaced starting in DIGI firmware version 1.09 by new coil addresses which can be
written to and read from the same coil number.
Coil #, Command
MBAP HEADER +
FUNCTION CODE
DATA
2, Set Active
00 01 00 00 00 06 01 05
00 01 FF 00
2, Set Standby
00 01 00 00 00 06 01 05
00 01 00 00
3, Pump On
00 01 00 00 00 06 01 05
00 02 FF 00
3, Pump Off
00 01 00 00 00 06 01 05
00 02 00 00
4, Disable Keyboard
00 01 00 00 00 06 01 05
00 03 FF 00
4, Enable Keyboard
00 01 00 00 00 06 01 05
00 03 00 00
5, Activate Alarm Relay
00 01 00 00 00 06 01 05
00 04 FF 00
5, Deactivate Alarm Relay
00 01 00 00 00 06 01 05
00 04 00 00
8.2 Legacy Modbus® Diagnostic Functions
The Modbus diagnostic Function is used to Set/Read information from the particle
counter. The list of commands below, may be used to configure the particle counter.
Example command strings (shown in hexadecimal format) are provided after the
tables to aid the user in understanding how Modbus diagnostics is implemented.
Modbus diagnostic functions are not used as commonly as the coil and register
functions covered in the Ethernet Interface section of this manual.
Read Commands
Diagnostic Code: Dec(hex)
Diagnostic Function
1024(400h)
Echo 16 Byte test array
1026(402h)
Read Unit Model Number
1028(404h)
Read unit serial number
1030(406h)
Read unit ID