.. _rs-232:

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
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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).