17
(3)
COM1/COM2 (9-pin): Serial Port Header
COM1
：
RS232/422/485 Serial Port Header
COM2
：
RS232 Serial Port Header.
Pin 1
6
*
Note
:
In the case that COM1 header supports RS422, RS485 function, besides connecting
compatible COM cable for RS422 or RS 485 function, user also needs to go to BIOS to set
corresponding ‘
Transmission Mode Select’
for COM1 (refer to Page-29).
Pin NO.
RS232
*RS422
*RS485
Pin 1
DCD
TX-
DATA-
Pin 2
RXD
TX+
DATA+
Pin 3
TXD
RX+
NC
Pin 4
DTR
RX-
NC
Pin 5
GND
GND
GND
Pin 6
DSR
NC
NC
Pin 7
RTS
NC
NC
Pin 8
CTS
NC
NC
Pin 9
RI
NC
NC
*COM1
COM2
