sWiFi/all
User Manual
27
3. Serial Port Pin Specification
Pin No.
RS232
RS422
RS485
1
DCD
TXD-
TRXD-
2
RXD
RXD+
-
3
TXD
TXD+
TRXD+
4
DTR
-
-
5
GND
GND
GND
6
DSR
-
-
7
RTS
-
-
8
CTS
RXD-
-
9
-
-
-
* As DCE (Data Communications Equipment) mode, RS232 port directly connects with DTE port such as PC.
* RS422 port cross-connects with DTE port. (Tx- with Rx-, Tx+ with Rx+, Rx- with Tx-, Rx+ with Tx+)
* RS485 port connects with DTE port. (TRx- with TRx-, TRx+ with TRx+)
* If you need setup while using as RS422 or RS485 port, connect to RS232 port and press RST button for
settings.
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