SNV-12 Operations Manual
3-89
E&M Interfaces
Figure 3-17 SVM-2 COR / E&M Input
When the jumper is in the “Norm” position, a 2.5 VDC (nominal) threshold signals active
COR. Active low is standard; a dipswitch on the SVM module changes operation to active
high. When the jumper is set to E&M, the threshold is approx –5 VDC nominal (use greater
than –0.5 VDC and less than –10 VDC as the definite switchover thresholds). The standard
setting is an indication of active COR for an input below –10 VDC, and inactive COR with an
input above –0.5 VDC. Again, the COR Polarity dipswitch on each SVM can reverse this.
Note: An identical circuit is used on the CIM-2A to provide a PTT input that can be triggered
by a negative voltage. The jumper on the CIM-2A is JP9. See Section 3.12.2.1.
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