W315A/325A
Hardware Connection Description
3-4
Connecting to a Serial Device
Use a serial cable to plug your serial device into the embedded computer’s serial port. Serial ports P1 to P2 have
male DB9 connectors and can be configured for RS-232, RS-422, or RS-485 communication by software. The
pin assignments are shown in the following table:
DB9 Male Port
RS-232/422/485 Pinouts
Pin
RS-232
RS-422
RS-485
(4-wire)
RS-485
(2-wire)
1
DCD
TxDA(-)
TxDA(-)
–
2
RxD
TxDB(+)
TxDB(+)
–
3
TxD
RxDB(+)
RxDB(+)
DataB(+)
4
DTR
RxDA(-)
RxDA(-)
DataA(-)
5
GND
GND
GND
GND
6
DSR
–
–
–
7
RTS
–
–
–
8
CTS
–
–
–
Connecting to the Serial Console Port
The serial console port is a 4-pin pin-header RS-232 port. It is designed for serial console terminals, which are
useful for viewing boot up messages.
Serial Console Port & Pinouts
Serial Console Cable
Pin
Signal
1
TxD
2
RxD
3
NC
4
GND
Connecting an Antenna
The W315A/325A embedded computers come with a 1 dBi antenna for GPRS communication. Connect the
antenna to the SMA connector located on the front panel of the embedded computer. Connect the antenna to
the computer by rotating it in a clockwise direction.
