FB3000 RTU Instruction Manual
D301851X012
November 2023
40 Installation
2.11 Connecting Additional Serial Communication
Ports (COM04/3SERL4/3SRSG4 Module)
The 4-Port Serial Communications Module (COM04) consists of a logic module (3SERL4)
and a personality module (3SRSG4). Each COM04 module provides 4 additional serial MVS
communication ports.
COM04 provides no loop power for connected devices, all devices must have external
power.
COM04 can be installed in any base chassis slot except for Slot 1. It cannot be installed in
an expansion chassis.
2.11.1 Wiring the Ports on the 3SRSG4 Personality Module
EXPLOSION HAZARD: Never open the enclosure in a hazardous area.
EXPLOSION HAZARD: Ensure the area in which you perform this operation is non-
hazardous. Performing this operation in a hazardous area could cause an
explosion.
Table 2-7. Communication Terminal Blocks on COM04 Module
COM Terminal Blocks