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.

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Boundless Technologies ADDS 3153 ASCII manual Host/Printer Port, Parallel Printer Port, Terminal to Modem DCE or Host
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ADDS 3153 ASCII specifications

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