Campbell Scientific 0871LH1 0871LH1 Freezing Rain Sensor - Page 30
Input/Output Specification
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3 Input/Output Specification 3.1 Input/Output Pin Designations Signal Name 24VDC Connector Pin A Table 10. Input/Output Pin Designations Input or Output Definition Input 18-29.5 VDC** Current 1.5 Amp Max at 28VDC 24VDC Return B Input ---- ---- Case Ground C Input ---- ---- RS-422 High D Output Per RS-422 Spec Per RS-422 Spec RS-422 Low E Output Per RS-422 Spec Per RS-422 Spec Ice F Output Ground Active (1.5V Max) 0.5 - 50 mA Open Inactive Status G Output Ground Inactive (1.5V Max) 0.5 - 50 mA 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. Wire Gauge 20 20 20 20-24 20-24 20-24 20-24 27
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3
Input/Output Specification
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.