User's Manual

INDUSTRIAL 4G LTE CELLULAR ROUTER - UM V1.1.8
17
Serial Port COM2 (RS-232)
The serial port COM2 is a RS-232 interface.
Pin
Description
RXD
COM2 Serial Port, RXD Signal (INPUT)
TXD
COM2 Serial Port, TXD Signal (OUTPUT)
GND
COM2 Serial Port, Signal Ground（※）
※
Both connectors (RS-232 and RS-485) have a common ground connection.
Serial Port COM3 (RS-485)
The serial port COM3 is a RS-485 interface.
Pin
Description
D -
COM3 Serial Port, Data- (B) wire
D +
COM3 Serial Port, Data+ (A) wire