07 KP 53 Intelligent MODBUS Coupler Technical Documentation

This document provides technical documentation for the ABB Control AC 31 system's Intelligent MODBUS Coupler 07 KP 53, an independent communication module with two MODBUS RTU protocol ports supporting master/slave modes on RS232 and RS485 interfaces. It details how the coupler enables network communication for 40 and 50 series central units, including compatibility requirements with specific software versions and product indexes.