Honeywell ERX - Modem Communication Configurations; External RS-232 Connection Options; Internal RS-232 Connection Options

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External Modem Communications without an External RS-232 Case Connector
Requires the use of an optional RS-232 to CMOS I/O Board, 40-2717-2:
See Messenger Modem manual for additional information.

Internal or External Communications with a RS-232 Case Connector
Requires the use of an optional RS-232 to CMOS I/O Board with shorting plug, 40-2717-3:
(Shorting plug not shown)