20
COM1/COM2 (9-pin): Serial Port Headers
(2.0 pitch)
COM1: RS232/422/485 Serial Port Header.
COM2: RS232 Serial Port Header.
Pin1
6
Pin NO. RS232
*RS422
(COM1)
*RS485
(COM1)
Pin 1
DCD
TX-
DATA-
Pin 2
SIN
TX+
DATA+
Pin 3
SO-
RX+
NC
Pin 4
DTR
RX-
NC
Pin 5
GND
GND
GND
Pin 6
MD SR-
NC
NC
Pin 7
MR TS-
NC
NC
Pin 8
MC TS-
NC
NC
Pin 9
COM2_MR2-
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 at first, before using specialized cable to
connect different pins of this port.
COM2
COM1
