v. 3.0
Reference guide
Compressor Control Module CM-RC-01
3.0
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10.
Programming and monitoring
10.1
Introduction
For monitoring and controlling the CM-RC-01, there is a built-in Modbus (RTU) interface.
10.2
Serial communication
Communication with the CM-RC-01 is via Modbus (RTU). Configuration and reading of status from
the CM-RC-01 is described in the following sections.
10.2.1
Modbus (RTU) configuration
Specification of the protocol:
Protocol:
Modbus (RTU mode). See http://www.modbus.org/specs.php
Modbus address:
Default address 48 (30 hex), can be changed to 1
– 247.
Baud rate:
Default 19200; 9600, 19200 and 115200 are selectable.
Number of data bits:
8
Parity:
Default Even; None and Odd are selectable
Number of stop bits:
Default 1; 2 (only 2 if Parity is set to None)
Setup of communication configuration is done via the BEST Software using COM1.
Please observe that register numbers are used in this manual!
CM-RC-01 (Slave)
System controller (Master)
