User Manual

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Name
Function
+5V
Module power, 5V input, output
3V3
Module power, 3.3V output
RX
Serial data input, TTL level
TX
Serial data output, TTLlevel
232R
Serial data input, 232 level
232T
Serial data output, 232level
A
RS485 Signal line A
B
RS485 Signal line B
GND
GND
DTR
Data terminal preparation/control flow output
RTS
Request to send