MANO540 Mini ITX Motherboard
18
Board and Pin Assignments
3.4.1
COM D-Sub Connector (CN1)
The CN1 is a double 9-pin D-Sub connector for COM1 and COM2 serial port interfaces
on the rear I/O. Only COM1 supports RS-232/422/485 mode. The pin assignments of
RS-232/422/485 are listed in table below.
COM1:
CN1B for COM2
CN1A for COM1
Note
[*]
: Pin 1 of COM1 can be DCD/+5V and pin 9 of COM1 can be RI/+12V by
selecting JP6 (see section 3.3.4).
COM2:
3.4.2
COM Headers (CN3~CN6)
The motherboard comes with four 2x5-pin (pitch=2.00mm) headers for COM3~COM6
serial port interfaces.
Pin
RS-232
(3T/5R)
RS-422
(1T/1R Full
Duplex)
RS-485
(1T/1R TX Enable
Low Active)
1
COM1C_DCD
[*]
TX(B)
(R(B) / T(B))
2
COM1C_RXD
TX(A)
(R(A) / T(A))
3
COM1C_TXD
RX(A)
NC
4
COM1C_DTR
RX(B)
NC
5
GND
GND
GND
6
COM1C_DSR
NC
NC
7
COM1C_RTS
NC
NC
8
COM1C_CTS
NC
NC
9
COM1C_RI
[*]
NC
NC
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
RX
4
RTS
5
TX
6
CTS
7
DTR
8
RI
9
Ground
10
NC
Содержание MANO540 Series
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