General Electric Serial Modbus Communication Interface Pack IS220PSCAH1A is an I/O pack that has six configurable serial channels which support several ports. The ports that are used with the IS220PSCAH1A pack are the RS422, RS485 half-duplex, and RS232 ports.

The IS220PSCAH1A I/O Pack is compatible with up to two possible Ethernet networks and a serial communication terminal board for electrical interfaces. This pack supports three distinct port channels, which are the RS485 half-duplex, RS232, and RS422 standards.