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Software Setups
3-5
3.3.1. Register x90h: Serial port
Bit
7
6
5
4
3
2
1
0
Reset
0
0
0
Read
RS485
RS232
ST1
Write
RS485
RS232
ST1
Used by the BIOS during the POST only.
Serial port 2 configuration/use
ST1
Enable RTS2 to be used as 485TX enable when in 485 mode
(1: enable, 0: disable).
RS232
Enable RS-232 mode for serial port 2 (1: enable, 0: disable).
RS485
Enable RS-422/RS-485 mode for serial port 2 (1: enable, 0: disable).
✎
NOTE
The RS232 and RS485 bits are initialized by the BIOS during POST
(Power-On Self Test). If a modification of these bits is required, be aware that
there is a hardware protection so that RS232 and RS485 buffers cannot be
activated at the same time. This protection is provided at the register level. If
you write to x90h register with bits 3 and 4 set, you will actually write 0 in both
of these bits. This condition can be read back.
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