4.1.1
COM Port Configuration
There are four COM ports for FES7501. The system’s COM1 and COM2 support
RS-232 (full-duplex), RS-422 (full-duplex) and RS-485 (half-duplex) mode, while
COM3 and COM4 support RS-232 mode only. You can set the COM1/ COM2
operating mode via BIOS settings.
Another option in the BIOS called “
Slew Rate
” defines how sharp the rise/ fall edge
is for the output signal of COM1/ COM2. For long-distance RS-422/ 485 transmission,
you may set the “
Slew Rate
” option as “High” to improve signal quality.
For RS-422/485 communication, the “
RS-422/485 Termination
” option determines
whether to enable/disable internal termination of RS-422/485 transceiver according
to your wiring configuration (e.g. with or without external termination).
To set COM port operating mode:
1.
When system boots up, press F2 to enter BIOS setup utility.
2.
Go to
[Advanced] > [Peripheral Configuration]
.
3.
Highlight the COM port you wish to set and press Enter to bring up setting options.
Scroll to and highlight the setting you wish to set and press Enter.
4.
Repeat step 2 to set other COM ports.
Press F10 to “Exit Saving Changes”.
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