Active forward monitor (afm) input, Dry contact closure, Figure 12 dry contact closure – Bird Technologies 3171B020 User Manual
Page 44: Logic “1" closure, Figure 13 logic “1" closure, Dry contact closure logic “1" closure
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Active Forward Monitor (AFM) Input
Wiring concept examples for activating the AFM circuit are shown below. These can be used for remote onsite or
offsite manual or automatic activation.
Dry Contact Closure
Closure will be from terminal 10 to case ground, terminal 7, in any convenient form, e.g. by an extra set of manual
contacts on the transmitter keying relay or a separate remote switch.
Figure 12 Dry Contact Closure
Logic “1" Closure
Closure circuit shown is a simplified means of interfacing a logic “1" as required from TTL driving positive signal, indi-
cating transmitter is on.
Figure 13 Logic “1" Closure