Communication To Cms; Physical Interface Rs-485; Control Unit’s Modbus-Id; Function Code - ABB CMS-700 User Manual

Circuit monitoring system

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CMS-700 SYSTEM CIRCUIT MONITORING SYSTEMS (CMS)

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Modbus

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Communication to CMS

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.

Parameter

Data rate

Data format

Line termination resistor (120Ω) needs to be added, if necessary, for CMS-700 having serial number

later than 700K1820000.

Control unit's MODBUS-ID

You can connect up to 247 control units to one Modbus RTU line. Each control unit must have a unique

Modbus ID (address).

• 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

Do not apply functions other than those specified.

Values

2400, 4800, 9600, 19200, 38400, 57600, 115200 Bit/s

even parity, odd parity, without parity

Modbus RTU

Default Values

19200 Bit/s

even parity

CMS Systems

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