AXIOMTEK SBC87842, User Manual

Page: 19 / 55

SBC87842 Single Board Computer
Board and Pin Assignments 13
2.4.8 COM1~COM4 Connectors (CN11~CN12)
The board comes with four standard DB-9 connectors on the rear I/O for
RS-232/422/485 interfaces. If you need these COM ports to support RS-422 or RS-485,
please refer to BIOS setting in section 4.4.
2.4.9 SMBus Connector (CN2001)
This is a 4-pin connector for SMBus interface. The SMBus (System Management Bus) is
a simple bus for the purpose of lightweight communication.
2.4.10 SATA Connector (SATA1)
This Serial Advanced Technology Attachment (Serial ATA or SATA) connector is for
high-speed SATA interface. It is a computer bus interface for connecting to devices such
as hard disk drive.
Pin RS-232 RS-422 RS-485
1 DCD TX- Data-
2 RXD TX+ Data+
3 TXD RX+ No use
4 DTR RX- No use
5 GND GND GND
6 DSR No use No use
7 RTS No use No use
8 CTS No use No use
9 RI No use No use
Pin Signal
1 +5V
2 Clock
3 Data
4 GND
Pin Signal
1 GND
2 TXP
3 TXN
4 GND
5 RXN
6 RXP
7 GND
1
1
7
1