Barber Colman A-13405-2 RS232 Communications PCB Circuit Board

Barber Colman A-13405-2 RS232 Communications PCB Circuit Board, also cataloged as A-13405-102, is a Barber-Colman MACO communications daughter board designed to provide an RS-232 serial interface for Barber-Colman control equipment. The unit is described in listings as a "RS232 Communications Daughter PCB" for MACO systems, confirming its role as an interface module that attaches to a MACO controller to enable serial data exchange with external devices. In various inventories it appears as part of the A-13405 family of MACO communication boards, with A-13405-2 and A-13405-102 variations referenced; some sources specifically associate the A-13405 family with MACO 5000 hardware. Additional references show the A-13405-102 variant described as a communication PC board for MACO hardware, underscoring its function within the Barber-Colman MACO ecosystem. This module is typically encountered in repair, surplus, and replacement contexts for MACO equipment, where technicians source the A-13405-2/102 board to restore or extend RS-232 connectivity between a MACO controller and external devices.