Boundless Technologies ADDS 3153 ASCII - Manual (Page 23)

10 Introduction
Host/Printer Port 2
This port, labeled “SES2-AUX,” is designed to connect to a second host connection
(computer or modem) or a serial printer, and can operate from 110 to 38,400 baud.
This port uses an RS-232-C interface via a DB25P female connector, and is configured
as a DCE (Data Communication Equipment) device. The pin assignments for this
port are shown below:
Host/Printer Port 2 Pin Assignments
Refer to the Installation chapter for details on the connection of all ports to serial
devices (hosts, modems, or printers).
Parallel Printer Port
This port, labeled “PAR,” is designed for connection to a parallel printer, which has a
Centronics interface with a 25-pin D-shell female connector. This port, unlike the
others, is a uni-directional device, which means that it only serves to output data to
the printer, and cannot receive. The pins and signals supported are shown below:
Parallel Port Pin Assignments
* These signals are held high, in an inactive state.
If you have opted to use a parallel printer, but it is not connected, an error message
will appear on the status line when any PRINT operation is done. To clear the
message, press
Ctrl-Shift-Tab .
Terminal to Modem (DCE) or Host
Refer to the diagram below to understand why a null modem adapter may be needed
when connecting the second serial port (SES2-AUX) to a modem or a DCE host. The
first host will connect directly without a null modem since it is a DTE device.