Acnodes FES93 Series, User Manual

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4.2 COM2/ 3/ 4 Port Configuration
The system’s COM2/ 3/ 4 ports support RS-232 (full-duplex) while COM2 also
supports RS-422 (full-duplex) and RS-485 (half-duplex) mode. The operating mode
can be configured via the BIOS. Another option in BIOS called “
Slew Rate
” defines
how sharp the rising/falling edge is for the output signal. 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 COM2/ 3/ 4 operating mode:
1. Press F2 when the system boots up to enter the BIOS setup utility.
2. Go to [Advanced]

[Peripheral Configuration] .
3. Set the [Set COM2/ 3/ 4 Mode as] option to the desired mode.
4. Once set, press F10 to save setting and exit.
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