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Communications 9
Host/Printer Port 1 (RS-232-C or RS-422)
This port, labeled “SES1-EIA,” is designed for connection to the host (computer or
modem) or a serial printer via a 25-pin D-shell (DB25P) female connector. This port
uses an RS-232-C communication interface, is configured as a DTE (Data Terminal
Equipment) device, and can operate from 110 to 134,400 baud. The pins supported
are shown below:
RS-232-C Host/Printer Port 1 Pin Assignments
This port also uses (if installed) an optional RS-422 communication interface and can
also operate from 110 to 134,400 baud. The pins supported are shown below:
25 222324 21 181920 17 141516
13 101112 9 678 5 234 1
L(out)+
L(out) - L(in) -
L(in)+
RS-422 Host/Printer Port 1 Pin Assignments