POC-551VTC
78
4.1
COM1/ 2 Port Configuration
The system’s
ports support RS-232 (full-duplex), RS-422 (full-duplex) and
RS-485 (half-duplex) mode. You can set the COM1/ 2 operating mode via BIOS
settings. The option in the BIOS setting called “
Slew Rate
” defines how sharp the
rising/falling edge is for the output signal of COM1/ 2. 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 COM1 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 COM1 Mode as]
option to the desired mode.
4.
Once set, press
F10
to save setting and exit.
