Device connection

Some Bitzer devices can be connected via Modbus or BEST protocol (in the same connection), for others only Modbus is available. The BEST connection may be preferable because communication is faster and all parameters can be addressed. However, some devices only have a Modbus connection, and if various devices are mixed in an installation with one gateway, only Modbus is possible as well.

Modbus and BEST protocols for Bitzer electronic products
Bitzer product	Modbus protocol	BEST protocol
IQ Module (CM-RC-01, CM-RC-02, CM-SW-01)	available	available
SE-i1	available	available
CSV.	available	available
VARIPACK	available	not available
ECOLITE	available	not available
ECOSTAR	available	not available

Use the following parameters for Modbus communication:

Supported Modbus parameters
Baud rate	19 200 bps
Parity	even
Stop bits	1 stop bit

Please also make sure that the IQ product has the latest firmware version installed. Supported firmware versions:

IQ Module CM-RC-02: all
IQ Module CM-RC-01: from 2.10.272.00
IQ Module CM-SW-01: from 2.9.92.00
SE-i1: from 2.4.117.00
CSV: from 1.92

With IQ Module CM-RC-02

Modbus connector for the communication with the gateway on IQ Module CM-RC-02

Note: The serial number of the IQ Module CM-RC-02 can be found by scanning the QR code on the module itself or by using the BEST Software.

With IQ Module CM-SW or CM-RC-01

Modbus /BEST connection on CM-SW-01 or CM-RC-01 (both protocols are possible at the same connection)

With SE-i1

Modbus connection on SE-i1

With CSV compressor

Modbus/BEST connection at CSV compressor

With CSV compressor and SE-i1

RJ12 connector of pins for BEST connection on CSV and SE-i1

With VARIPACK

Terminals of the Modbus interface socket of the VARIPACK

Connect the FI to a PC via the BEST interface converter and the RJ45 adapter cable marked in blue.

With Ecostar condensing unit

Modbus connection at ECOSTAR controller

With Ecolite condensing unit