You can connect the WSC11 or WSP21 weather stations directly to the Priva Blue ID controller via an RS485 connection. The WSC11 and WSP21 are both supplied with a 15 metre cable. If the distance is greater than this, you must extend the cable and take measures to ensure a stable connection.

Making a connection with a cable that is less than 15 meters long

For distances up to 15 metres, you can connect the WSC11 directly to the Priva Blue ID controller and to a 24 VDC power supply.  The WSC11 comes with either a 5 conductor or 7 conductor cable. The two drawings show the wiring color of each of the cables.

Wiring colors for a WSC11 sensor with a 5 conductor cable

Wiring colors for WSC11 sensor with a 8 conductor cable

Wiring colors for WSP21 sensor

1. Connect the supplied sensor cable (AWG26) with the screw connector to the weather station.
2. Calculate whether the 24 VDC power supply for Compass field equipment has sufficient capacity to also power the weather station. Add an extra power supply if the capacity is insufficient.
3. Connect the wires for the power supply to the 24 VDC power supply for Compass field equipment.
4. Connect the data wires to the RS485 port of the C4.

Making a connection with a cable that is more than 15 meters long

For distances greater than 15 metres, you must use an additional cable. You must also follow the rules for biasing and terminating the RS485 network.

Wiring colors for a WSC11 sensor with a 5 conductor cable

Wiring colors for a WSC11 sensor with a 8 conductor cable

Wiring colors for a WSP21 sensor

Requirements
• A water tight junction box with an IP code of at least IP65
• A terminating resistor of 120 Ω / ½ W
• An extension cable with the following requirements:

• 0.6 mm (AWG22)
• twisted pair
• shielded

• A device for termination and biasing at the Priva recommends that a standard module should be used for this. One example is the LT-B4 from Loytec.

1. Connect the supplied sensor cable (AWG26) with the screw connector to the WSC11.
2. In a junction box, connect the wires of the sensor cable to the extension cable.
3. In the junction box, install a terminating resistor of 120 Ω / ½ W between the data+ and data - wires (This is the brown/green pair on the 5 conductor cable and the green/yellow pair on the 7 conductor cable.
4. Calculate whether the 24 VDC power supply for Compass field equipment has sufficient capacity to also power the weather station. Add an extra power supply if the capacity is insufficient.
5. Connect the wires for the power supply to the 24 VDC power supply for Compass field equipment.
6. Connect the data wires to the RS485 port of the C4.
7. Connect the biasing and bus termination module in accordance with the diagram above.

Adjusting the rain heater on the weather station

The WSC11 has an adjustable rain heater.  You can increase the heater level if you find that the WSC11 rain detection is triggered by dew at night. You can decrease the heater level if you find that the WSC11 does not detect a light mist as rain.  

The rain heater adjustment is not available in earlier versions of the Compass. To adjust the rain heater, you need to ensure that your Compass software is at least at version 121240205 released on April 15, 2024.

In the Weather -> Configuration page, you will find a setting labeled 'WSC11 rain sensor heat level'. There are five heat levels that can be set.  VERY_HIGH_HEAT is the highest level. This will ensure that dew is not detected as rain but it may also not detect a light mist.  Also the rain heater is is close proximity to the outside temperature sensor and it may affect the outside temperature if there is no wind to dissapate teh heat. 

VERY_LOW_HEAT is the lowest level but this may not be able to differentiate between dew and rain.

There are also three intermediate levels. You can try the different levels to determine what works best in your geographic region.