20
COM1/2/3/4/5/6(9-pin): Serial Port Headers
(pitch 2.0mm)
COM1: RS232/422/485 Serial Port Header.
COM2/3/4/5/6: RS232 Serial Port Header.
6
Pin 1
COM3
COM
5
COM2
COM4
COM6
*COM1
Pin NO. RS232
*RS422
(optional)
*RS485
(optional)
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
*Note: COM1 header can function as RS232/422/485 port header.
In normal
settings COM1 functions as RS232 header. With compatible COM cable COM1 can
function as RS422 or RS 485 header. User also needs to go to BIOS to set
‘
Transmission Mode Select’
for COM1 (
refer to Page-34
) at first, before using
specialized cable to connect different pins of this port.
