Need help for "On Hook" functions on GM360

[TenFour Comms]

First of all a big hello to all of you
...now for my question. Can we programm the GM 360 (i think is CDM 1550 or 1250 for U.S. correct me if i'm wrong) when the mic goes on hook to send a specific telegram no matter what is going on with any of the timers? And in case you didn't get it I want to send a telegram every time the mic goes on hook no matter what is going with squelch or monitor or whatever. Can anyone one help me with this? or to propose any other solution? Thanks in advance!!
Nickolas
SW1NZP

[chartofmaryland]

This can be more easily done with an older hang up box which contained a reed switch for PL / Montior.

You can still order these from Motorola as these were issued with Maratrac's and Mitrek's that used the clamshell head.

The wiring included is green and black and these two leads can be used to show a closure for your timer circuit which can be interfaced to a QC-II or other signalling option on the rear of the CDM style radio giving you a transmission to notify when a mic has been "hung up".

The hang up box can also be duplicated with the telephone style handset which too has a PL / Monitor option and can be wired the same way.

Just remember your need for the one shot timer who does the job of sensing the closure and itself provides a one time momentary closure on the input signalling pin so you don't have a radio constantly transmitting the notice of a hang up.

Jason

[Bill_G]

Creative solution Jason. That old Mitrek hangup with the micro switch is a great idea. I'll have to look at CDM cps to see if the radios have an aux i/o that can be defined and associated with conditional signalling. Hopefully Nickolas is using a protocol the radio is capable of encoding.

[chartofmaryland]

Bill, the easiest was to use Pin 9 ( External Alarm ) and it would trigger the emergency feature. Reprogram the impolite tries for the emergency to just 1 and your radio will go Man Down one time sending this information to the decoder located with your dispatcher.

The other option I didn't get time to play with was External Call. This was selectable on a number of pins.

I didn't use the mic for my activation although that was the exact same process that set off my setup.

The project was to alert dispatch when the ALS drug box was removed from the storage location on the ambulance. That way, the crew being involved with saving someone's life and having no other reason to remove the box, would give an early indicator to dispatch they were not just on a trouble breathing situation.

Due to the remoteness of the departments and the delay in a daytime volunteer public safety agency it helped get another unit or ALS provider started before the unit in the field had to even transmit the status of the situation.

Only one drawback which was due to the terrain, there were occations when a bumpy road would dislodge the drug box for an instant causing the dispatcher to believe the unit was experiencing a code with no patient on board. After placing a velcro strap accross the box this problem was resolved.

CoM