MANO520 Mini ITX Motherboard
18
Board and Pin Assignments
2.4.11
COM D-Sub Connector (CN21)
The CN21 is a double-deck D-Sub connector for COM1 and COM2 serial port interfaces
where only COM1 is selectable for RS-232/422/485 mode by jumper settings (see
section 2.3.3). The pin assignments of RS-232/422/485 are listed in table below.
COM1:
COM1
COM2
Note
[*]
: Pin 1 of COM1 can be DCD/+5V and pin 9 of COM1 can be RI/+12V by
selecting JP5 (see section 2.3.4).
COM2:
2.4.12
COM Wafer Connectors (CN22 and CN23)
The motherboard comes with two 5x2-pin (pitch=2.00mm) wafer connectors for COM3
and COM4 serial port interfaces.
Note
Cable is optional.
Pin RS-232
RS-422
RS-485
1
DCD#
[*]
TX-
Data-
2
RXD
TX+
Data+
3
TXD
RX+
N/C
4
DTR#
RX-
N/C
5
GND
GND
GND
6
DSR#
N/C
N/C
7
RTS#
N/C
N/C
8
CTS#
N/C
N/C
9
RI#
[*]
N/C
N/C
Pin
Signal
Pin
Signal
1
DCD
2
RXD
3
TXD
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI
Pin
Signal
Pin
Signal
1
DCD
2
DSR
3
RXD
4
RTS
5
TXD
6
CTS
7
DTR
8
RI
9
GND
10
N/C
