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JANUS? 2020 Hand-Held Computer (4MB) - Intermec

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<strong>JANUS</strong> <strong>2020</strong> <strong>Hand</strong>-<strong>Held</strong> <strong>Computer</strong> User’s Manual (<strong>4MB</strong>) NF BC<br />

Working With <strong>JANUS</strong> COM Ports<br />

6-6<br />

Communications ports, also called COM ports, are locations from which data<br />

can be passed into and out of the reader. COM ports offer serial<br />

communications, which means that data is transmitted one bit at a time over a<br />

single line from one computer to another.<br />

The next sections cover these topics:<br />

• Identifying <strong>JANUS</strong> COM Ports<br />

• Examining the COM1 Optical Port Signals<br />

• Understanding How IRQs Affect COM Ports<br />

Identifying <strong>JANUS</strong> COM Ports<br />

This illustration identifies the COM ports on the reader, and the next table<br />

explains how each is designated as a COM port.<br />

Logical COM4<br />

COM4<br />

Type II PC<br />

card drive containing<br />

a modem card<br />

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<strong>2020</strong>U.044<br />

COM1<br />

Optical port

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