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

JANUS 2020 Hand-Held Computer User’s Manual (4MB) NF BC
6-22
To calculate the two-digit hex value
1. Use the illustration on the previous page as a guide for calculating the
value for the FCR.
In this illustration, the two-digit hex value is the value you will specify for
the FCR. Calculate this value by converting the contents of the FCR byte to
two hexadecimal numbers.
The FCR byte contains eight bits. Each bit represents a parameter that
controls how the UART buffer operates. You set or clear each parameter by
setting each bit to 1 or 0.
2. Choose 1 or 0 for each bit in the FCR byte. Read the descriptions to decide
whether to set or clear each bit.
3. Convert the bits to two hexadecimal numbers. The resulting two-digit hex
number is the value you will specify for the FCR.
For example, a two-digit hex value of 81 enables UART 16x550 mode,
requires the buffer to receive four bytes of data before generating a receive
interrupt, and leaves all other parameters disabled:
8 1
1 0 0 0 0 0 0 1
To specify the value
2020U.186
• Specify the value for the FCR using one of these methods:
Use IC.EXE Start IC.EXE, choose COM1 from the COM menu, and type the
value into the FIFO CONTROL REGISTER parameter. For help using
IC.EXE, see Chapter 5, “Configuring the Reader.”
Scan a command Scan the Communications Port, UART Restore command
in Chapter 12, “Configuration Command Reference.”
Use software interrupts Use software interrupts in your application. For
help, see your JANUS PSK reference manual.