Campbell Scientific 0871LH1 Freezing Rain Sensor - Manual (Page 30)

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3 Input/Output Specification
3 3.1 Input/Output Pin Designations
Table 10. Input/Output Pin Designations
Signal Name
Connector
Pin
Input or
Output
Definition Current
Wire
Gauge
24VDC A Input 18-29.5 VDC**
1.5 Amp Max at
28VDC
20
24VDC Return B Input ---- ---- 20
Case Ground C Input ---- ---- 20
RS-422 High D Output Per RS-422 Spec Per RS-422 Spec 20-24
RS-422 Low E Output Per RS-422 Spec Per RS-422 Spec 20-24
Ice F Output Ground Active (1.5V Max) 0.5 - 50 mA 20-24
Open Inactive
Status G Output Ground Inactive (1.5V Max) 0.5 - 50 mA 20-24
Open Active
**Ice will be correctly detected between these voltages. Proper probe de-icing, however, is only
guaranteed when input voltage is 24VDC or greater.