SBC81200 LGA775 CPU Card Series User Manual
Hardware Description
34
4.9 Serial
Port
Interface
The serial interface onboard
SBC81200
consists of COM1 port
(
CN4
) and COM2 (
CN8
) supports RS-232/422/485
4.9.1 Serial Ports IRQ Selection
SBC81200
uses two 10-pin connectors for COM1
(CN4)
and
COM2
(CN8)
. Interrupt Requests on COM1 and COM2 are
selected via IRQ4 and IRQ3 respectively. Additionally, both
ports can be enabled or disabled via BIOS setting.
RS-232/422/485 PIN Assignment: CN4,CN8
Description
CN4
CN8
D-SUB
9PIN
RS-232
RS-422
(CN8)
RS-485
(CN8)
1
1
Data Carrier Delect(DCD)
TX-
Data -
2
6
Data Set Ready(DSR)
NC
NC
3
2
Receive Date(RXD)
TX+
Data +
4 7
Request
to
Send(RTS)
NC NC
5 3
Transmit
Data(TXD)
RX+ NC
6
8
Clear to Send(CTS)
NC
NC
7
4
Data Terminal Ready
(DTR)
RX- NC
8 9
Ring
Indicator(RI)
NC NC
9 5
GND
GND
GND
10 X NC
NC NC
1
9
2
10
CN4/CN8 D-SUB 9PIN
RS-485 Receive Data: COM2 RTS Register must be clear.
Содержание SBC81200 Series
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