ABB CMS-700 - Communication to CMS

52 CMS-700 SYSTEM CIRCUIT MONITORING SYSTEMS (CMS)
—
Communication to CMS
—
Modbus
Physical Interface RS-485
To communicate with the CMS from an upper system, all devices (masters & slaves) must have the same
data rate and data format. These settings are defined over the Web UI, as described in the dedicated
chapter.

later than 700K1820000.
Control unit’s MODBUS-ID
Modbus RTU
CMS Systems
You can connect up to 247 control units to one Modbus RTU line. Each control unit must have a unique
Modbus ID (address).
Function Code
• Read operation on registers with access code “R” or “RW” is defined by function 03h “Read Holding
Registers”
• Write operation on registers with access code “W” or “RW” is defined by function 06h “Write Single
Register”
Do not apply functions other than those specified.
Parameter Values Default Values
Data rate  
Data format even parity, odd parity, without parity even parity