Common Sensor Wiring

Commonly Used Sensor Wiring

• Judd Snow Depth:

Power: Red -- 12 volts
Ground: Black -- Ground
Shield: Clear -- Ground
Reset: Green -- Control Port
Transmit: White -- Control Port

• SR50 / SR50A Sonic Distance Sensor

Power: Red -- 12 volts
Ground: Black -- G
Shield: Clear -- G
Sensor Ground: White -- G
Communication: Green -- Control Port

• CS105 Vaisala Barometric Pressure Sensor

Power: Red -- 12 volts
Ground: Black -- G
Shield: Clear -- G
Signal: Blue -- SE Channel
Signal Ground: Yellow -- AG
Reset: Green -- Control Port

• TE525M Rain Gage

Signal +: Black -- Mode 1 - Pulse Channel; Mode 2 - 5 Volts
Signal -: White -- Mode 1 - G; Mode 2 - Control Port 7 or 8

• HMP45C (older)

Power: Red -- 12 volts
Ground: Black -- G
Shield: Clear -- G
Temperature Signal: Yellow -- SE Channel
Relative Humidity Signal: Blue -- SE Channel
Signal Ground: Purple -- G
Reset: Orange -- Control Port

• HMP45C (newer)

Power: Red -- SW12V
Ground: Black -- G
Shield: Clear -- G
Temperature Signal: Yellow -- SE Channel
Relative Humidity Signal: Blue -- SE Channel
Signal Ground: White -- G

• CS615 / CS616 Soil Moisture Sensor

Power: Red -- 12 volts
Ground: Black -- G
Shield: Clear -- G
Signal: Green -- SE Channel
Reset: Orange -- Control Port

• Met One Wind Speed 034A

Signal +: Red -- Pulse Channel
Signal -: Black -- G
Shield: Clear -- G 

• Met One Wind Direction 034B

Signal: Green -- SE Channel
Excitation: Blue -- Excitation Channel
Signal Ground: White -- AG
Shield: Clear -- G

• RM Young Wind Speed & Direction 05103

Wind Speed +: Red -- Pulse Channel
Wind Speed -: Black -- G
Wind Direction Excitation: Blue -- Excitation Channel
Wind Direction Signal: Green -- SE Channel
Wind Direction Signal Ground: White -- AG
Shield: Clear -- G

• Generic Thermistor:

Excitation: Precision Resistor From Excitation Channel to SE Channel
Signal +: Wire 1 - SE Channel
Signal -: Wire 2 - AG

• HMP155 MD485 mode

Pin2 - Connect to MD485A
Pin6 - Connect to MD485B
Pin7 - Connect to 12V
Pin8 - Connect to Ground
Put MD485 in transparent mode and connect RS485 port to either the CSIO or the RS232.  CSIO is good because then the unit is powered, which simplifies the wiring a bit.

Default HMP155 Mode:

4800 baud
even parity
7 data bits
1 stop bit
no flow control

MD485s can't support this so you'll need to use the Vaisala USB interface to first communicate with the HMP155 to change the settings like this:

seri 9600 n 8 1

Also, set up the formatting:

form 5.3 T " " RH #n

Typing in a question mark (?) will get you a dump of the unit's settings and serial numbers etc.