21
(9) COM1/2/3/4/5/6 (9-pin): Serial Port Header
COM1/2
:RS232/422/485 Serial Port;
COM3/4/5/6
:RS232 Serial Port Header.
6
Pin 1
COM3
*COM1
COM4
*COM2
COM5
COM6
Pin NO. RS232
*RS422
(COM1/2)
*RS485
(COM1/2)
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
DSR-
NC
NC
Pin 7
RTS-
NC
NC
Pin 8
CTS-
NC
NC
Pin 9
RI-
NC
NC
*Notice:
COM1/2 header can function as RS232/422/485 port header. In normal
settings COM1/2 functions as RS232 header. With compatible COM cable COM1/2
can function as RS422 or RS 485 header. User also needs to go to BIOS to set
‘
Transmission Mode Select
’ for COM1 or COM2 at first, before using specialized
cable to connect different pins of this port.
