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2.4.9
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:
Pin
RS-232
[*]
1
DCD#
2
RXD
3
TXD
4
DTR#
5
GND
6
DSR#
7
RTS#
8
CTS#
[*][**]
9
RI#
COM2:
Pin
Signal
1
DCD
3
TXD
5
GND
7
RTS
[**]
9
RI
[*]
: 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).
[**]
Note
2.4.10
COM Headers (CN22~CN23 and CN36~CN37)
The motherboard comes with four 5x2-pin (pitch=2.00mm) headers (CN22~CN23 for
COM3~COM4, CN36~CN37 for COM5~COM6).
Pin
Signal
1
DCD
3
RXD
5
TXD
7
DTR
9
GND
[*]
Note
Board and Pin Assignments
RS-422
RS-485
TX-
485-
TX+
485+
RX+
N/C
RX-
N/C
GND
GND
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C
Pin
Signal
2
RXD
4
DTR
6
DSR
8
CTS
: Pin RI on COM1 and COM2 do not support wake on ring.
Pin
Signal
2
DSR
4
RTS
6
CTS
[*]
8
RI
10
N/C
:Pin RI on COM3,COM4,COM5 and COM6 do not support wake on ring.
MANO522 Mini ITX Motherboard
CN21
COM1
COM2
17
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