RS-232

RS-232 expansion modules can be installed into the three (A, B, C) expansion slots for industrial I/O modules. This interface is implemented using the MAX3221 (or compatible) transceiver and interfaces with the processor’s UART ports. Up to three RS-232 modules can be installed simultaneously.

Configuration and access

Once properly installed into an I/O slot, the RS-232 interface can be accessed via the ttyRS232_X TTY device, where X is the slot name (A, B, C).