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

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 />

6-20<br />

Specifying a Value for the FIFO Control Register<br />

If you turn off your <strong>JANUS</strong> reader while running a non-<strong>Intermec</strong><br />

communications application, the reader cannot access and save the contents of<br />

the First In First Out (FIFO) control register (FCR). The FCR contains a hex<br />

value that controls the Universal Asynchronous Receiver/Transmitter (UART)<br />

buffer.<br />

When you turn the reader back on, the reader sets the FCR to its default value,<br />

0 hex, unless you have already specified a value that the reader can use to<br />

restore the FCR. You should specify another value if the default is not<br />

appropriate for how the communications application configures the FCR.<br />

You need to determine if you should specify a value for the FCR, calculate<br />

what the value should be, and then specify the value. The next sections<br />

describe how to perform these tasks.<br />

To determine if you should specify a value<br />

• You must specify a value if you plan to run a non-<strong>Intermec</strong><br />

communications application on COM1 that changes the reader’s COM1<br />

UART FCR to use UART 16x550 mode, and you do not load an <strong>Intermec</strong><br />

protocol handler into memory.<br />

Many communications applications change the reader’s COM1 UART FCR<br />

to use UART 16x550 mode. To learn if your application uses UART 16x550<br />

mode, see its manual.

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