Appendix A. M12 pinout and
wiring
The M12 connector provides RS-232 and RS-485 serial interfaces.
The 8-pin M12 connector is located on the side of the air quality transmitter and provides
power and data to the transmitter.
The following pinout is from the side of AQT530, not the cable.
2
1
6
5
7
4
3
8
Figure 5 Pinout of M12 connector
Table 39 Pinout of M12 connector
M12 pin
Wire color
RS-232
RS-485
1
White
Data GND
Data GND
2
Brown
RX (input)
−
3
Green
TX (output)
−
4
Yellow
No connection (floating)
5
Gray
−
B (-)
6
Pink
−
A (+)
7
Blue
Power GND
Power GND
8
Red
Power 10 ... 25 V DC
Power 10 ... 25 V DC
−
Black
Cable GND
Cable GND
RS-232 serial interface
The RS-232 interface is used mainly for the maintenance connection.
RS-485 serial interface
The RS-485 interface is used mainly for the data connection.
RS-485 supports Modbus ASCII and Modbus RTU, and ASCII formatted text with comma
separated values (CSV).
Appendix A – M12 pinout and wiring
55
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