AXIOMTEK sbc84500, Руководство пользователя

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SBC84500 User’s Manual
3.14 Serial Port Interface
The SBC84500VEA has four onboard serial ports, with
COM1,COM3,COM4 as RS-232 and COM2 as RS-232/422/485, both
selected via jumper setting. Both ports have +5V/12V power on pins 1 (+5V)
and 8 or pin 9 (+12V), depending on jumper selection. The RS-232’s pin
assignments are listed below;
CON1 COM2 COM3 COM4 Description
1 1 1 1
Data Carrier Detect (DCD)
6 2 2 2 Data Set Ready (DSR)
2 3 3 3
Receive Data (RXD)
7 4 4 4
Request to Send (RTS)
3 5 5 5 Transmit Data (TXD)
8 6 6 6
Clear to Send (CTS)
4 7 7 7 Data Terminal Ready (DTR)
9 8 8 8
Ring Indicator (RI)
5 9 9 9
Ground (GND)
X 10 10 10 GND
1 2
3 4
5 6
7
8
9
1 0
NOTE:
The COM2~COM4 ports of SBC84500VEA are pin header
type connectors and COM1 is a DB-9 connector.
The RS-422/485 pin assignment for COM2 is listed as follows;
Pin RS-422 RS-485
1
TXD- DATA-
2
x X
3
TXD+ DATA+
4 x X
5
RXD+ X
6
x X
7 RXD- X
8
x X
9
GND GND
10
x X
9 10
1 2
Hardware Description
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