CDM1250 External Alarm

[cshort1987]

 

[cshort1987]

 

[cshort1987]

Also would the trigger - need to be connected to anything

 

[ramal121]

Thanks for the screen shots, that really helps. Things look good. You have the station tones in as A-B. The dispatch channel is set for the quick call system. The signalling squelch is set for "or", this will allow you to always receive traffic on that channel out the speaker. As a note you'll need to have the radio sit on this channel and not scan. Scanning can reduce or completely wipe out the ability to decode the page depending how scan is set. Disable any scan button and leave it on channel.

The only thing I'd change is under Radio Config>Accessory Config> External Alarm Config is to make that Permanent External Alarm is ensure that function is always enabled.

You should be good to go.

For the Elk 924 relay, the + and - would go to the power supply that runs the radio and the + trigger would go to pin 4 on the radio acc.

 

[cshort1987]

Its still not tripping it, only thing radio does now is say call received and a have to push a button on mic to clear it

 

[cshort1987]

Also on the elk what would be correct configuration out to the horn com and n/o ?

 

[cshort1987]

Also what about the debounce enabled or no?

 

[SteveC0625]

Also what about the debounce enabled or no?

My notes say that debounce doesn't matter on those two pins with those settings. Check the boxes and test it out when ready. If there's a problem, unchecking debounce is a first troubleshooting step.

Others may have differing ideas.

 

[cshort1987]

Im not getting a thing out of pin 4, but when we receive a call the radio show a "call received " and beeps

 

[jim202]

I will jump in here and try to explain that the normal output is an open collector in the radio. This open collector pulling to ground will not support a whole lot of current. Think it's limited to something like 60 or 100 MA. So if the relay pulls more than that to keep it energized, then you will need to come up with a relay driver of some sort. Like a one transistor that can hold the relay current.

So you need to put 12 volts in on one side of the relay and then take the other side of the relay and connect it to the radio. You probably need to put a reverse diode across the relay coil to kill the reverse or back EFM the coil will produce when you remove the ground via the radio.

There are all sorts of circuits around that will do this for you that you can build. Just do some searching or even break down and look in the ARRL "Radio Amateur Handbook".

 

[ramal121]

Also on the elk what would be correct configuration out to the horn com and n/o ?

That is correct

Also what about the debounce enabled or no?

Debounce is for inputs only, so disregard it doesn't matter

Im not getting a thing out of pin 4, but when we receive a call the radio show a "call received " and beeps

Try removing the pin 4 wire from the relay board and put a voltmeter on it. Look for a voltage change on decode. Should go from 0 volts to above 12 volts. If there is no voltage change then something else in the programming or the output has been damaged somehow.

 

[Fire125]

Ray's site shows several screen shots of the the CPS. I think that's enough to do the programming.

There is no single place or document that I know of the has all the info on programming the Pro Series. You've got to do a bunch of searching to gather the info. I've been prowling the net, batlabs, RR, and a couple of other forums for four years now learning about the Pro and Commercial series plus a couple of side trips on other Motorola radios. Everything I find gets digested, and in many cases, added to a pile of notes that I keep in a binder here.

If you are just doing station alerting without all the bells and whistles that Ray documents, you may have better luck using the Alarm function instead of the PA system. It just requires Pin #4 to be set to Alarm (Output). I think you set the active level HIGH which will power the relay briefly and trip whatever you are controlling.

We have a similar setup on our base, but it triggers a Zetron Model 19 which records the dispatcher's message and the blows our tones and plays the message. I will take a look at the programming and see how our shop set it up. It was an old system that they built in the '90's based on a GM300. When we purchased a new CDM1250 two years ago, we had them come back and move it over. They had some problems along the way and had to install a new trigger relay. Also, somewhere in the move, the alarm transistors got blown in the radio which necessitated another repair. Something to keep in mind.

did you check the programming?

 

[NCFire11]

I am setting up something similar.

The problem I have is when the radio is OFF or just powered up I am getting 12v on pin 4. When the radio is alerted I get 12v and after my custom setting of 5 seconds pin 4 goes down to 0.60v or so. In short pin 4 has +12v on it when the radio is off or has not been activated for the first time. It is set to active high.

Therefore, if i turn the radio off or when it is first turned on the relay will be active. What I'm trying to avoid is annoying alerts if the radio is power cycled or even turned off.

The rest of the system will use a relay driven from pin 4 to activate two time relays with one set to 2 seconds to activate an alarm for 2 seconds and another set to 3 minutes to turn on steady red lights in the halls for 3 minutes.

 

[dkaskie]

I am baffled. I have everything set for pin 4 ACTIVE HI for External Alarm. I have alarm trigger time set for 2 seconds. I am getting no voltage between pins 4 and 7 with my meter after an alert. If I change the programming to active LOW, i get 12V between pins 4 and 7. Is my ACTIVE HI for pin 4 damaged?

 

[cmdrwill]

I am baffled. I have everything set for pin 4 ACTIVE HI for External Alarm. I have alarm trigger time set for 2 seconds. I am getting no voltage between pins 4 and 7 with my meter after an alert. If I change the programming to active LOW, i get 12V between pins 4 and 7. Is my ACTIVE HI for pin 4 damaged?

Are you using a small low power relay? Most configurations use Active Low, the radio pin 4 is wired to to one side of the relay coil. and 12 volts on the other coil lead.

 

[dkaskie]

I planned to activate a small triggering relay with the I/O ACTIVE HI +12V from pin 4. I understand this relay must be within certain specs; however, with my digital meter I am getting no voltage from pin 4 to ground immediately after alerting the radio with my service monitor.

I have alert timing set for 2 seconds. I should get +12V to ground for 2 seconds after alert correct?

 

[dkaskie]

Here are the screenshots of my programming.

 

[dkaskie]

ANY HELP??

 

[cmdrwill]

All the radios we worked on have a transistor that switches a ground to activate the relay.

12 volts to one side of the relay coil, other side to pin 4.

 

[btromp]

We always use active low on the output pins. The few times we tried active high there seemed to be a problem with the internal circuitry and it doesn’t work the way we expected.


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