SELCO A/S M2500 Installation Manual
Revision: 23-04-2012 Page 28
6.1.3 RS485 MODBUS
M2500 includes an RS485 interface MODBUS RTU communication.
RS485 Connector:
Pin 1: RS485 A
Pin 2: RS485 B
Pin 3: RS485 COM
The RS485 Modbus is to be terminated on both ends with a 120Ω resistor.
6.1.4 RS485 cable
Unshielded twisted pair 2 x 2 x 0,22... 2 x 2 x 0,5 (e.g. Lapp Kabel UNITRONIC®, BUS CAN
UL/CSA (CMX), part number 2170267).
One pair is to be used for RS485 A and RS485 B, one wire of the remaining pair is to be used for
RS485 com.
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