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7.9. Serial COM1 & COM2 Ports (CN23 & CN22)
The 10-pin 1.25 mm pitch serial COM wafer CN22 and CN23 provide RS232/422/485 connections.
Figure 20: Serial COM CN22, CN23
Table 25: Pin Assignment CN22, CN23
Pin
RS232 Signal
1
DCD
2
DSR
3
RXD
4
RTS
5
TXD
6
CTS
7
DTR
8
RI
9
GND
10
+5V
Table 26: Signal Description
Signal
TXD
RXD
DTR
DSR
RTS
CTS
DCD
RI
TX+/-
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RS422 Signal
TX-
-
TX+
-
RX+
-
RX-
-
GND
+5V
Description
Transmitted Data, sends data to the communications link. The signal is set to the marking
state (-12 V) on hardware reset when the transmitter is empty or when loop mode
operation is initiated.
Received Data, receives data from the communications link.
Data Terminal Ready, indicates to the modem etc. that the on-board UART is ready to
establish communication link.
Data Set Ready, indicates that the modem etc. is ready to establish a communications link.
Request To Send, indicates to the modem etc. that the on-board UART is ready to
exchange data.
Clear To Send, indicates that the modem or data set is ready to exchange data.
Data Carrier Detect, indicates that the modem or data set has detected the data carrier.
Ring Indicator, indicates that the modem has received a ringing signal from the telephone
line.
Transmitted Data differential pair sends data to the communications link.
Half Duplex RS485
Full Duplex RS485
Signal
Signal
DATA-
TX-
-
-
DATA+
TX+
-
-
-
RX+
-
-
-
RX-
-
-
GND
GND
+5V
+5V
3.5"-SBC-WLU - User Guide, Rev. 1.0
Note
// 36
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