3.5"-SBC-APL V2.0 - User Guide, Rev. 2.2
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7.9.
Serial COM1 - COM6 Ports (CN17 - CN22)
Figure 22: Serial COM CN17 - CN22
Table 33: Pin Assignment CN17, CN18
Pin
RS232 Signal
RS422 Signal
Half Duplex
RS485 Signal
Full Duplex
RS485 Signal
Note
1
DCD
TX-
DATA-
TX-
2
DSR
N/A
N/A
N/A
3
RXD
TX+
DATA+
TX+
4
RTS
N/A
N/A
N/A
5
TXD
RX+
N/A
RX+
6
CTS
N/A
N/A
N/A
7
DTR
RX-
N/A
RX-
8
RI
N/A
N/A
N/A
9
GND
GND
GND
GND
10
+5V
+5V
+5V
+5V
Table 34: Pin Assignment CN19 - CN22
Pin
RS232 Signal
Note
1
DCD
2
DSR
3
RXD
4
RTS
5
TXD
6
CTS
7
DTR
8
RI
9
GND
10
+5V
Table 35: Signal Description
Signal
Description
TXD
Transmitted Data, sends data to the communications link. The signal is set to the marking state (-12