3.9 Wiring
Figure 13 M12 5-pin A-coded male connector pinout
Pin # Function Notes Wire colors in Vaisala cables
1 Power supply Operating voltage:
• HMP7: 18 ... 30 VDC
• Other models: 15 ... 30 VDC
Current consumption: 10 mA typical,
500 mA max.
Brown
2 RS-485 - White
3 Power GND and
RS-485 common
Blue
4 RS-485 + Black
5 Not connected Gray
RS-485 host
DC power supply
RS-485 +
RS-485 -
RS-485 common
+
-
Pin #1
Power supply
Pin #2
RS-485 -
Pin #3
Power GND
RS-485 common
Pin #4
RS-485 +
Pin #5
Probe
Figure 14 RS-485 wiring
Chapter 3 – Installation
25
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