MOTOTRBO M8668i - Telemetry Questions

[hung24p4]

Hi everyone,

I have been trying to make use of one simple telemetry application but nothing seems to succeed til now.
Please look at the images below for details.









I connect the radio's GPIO2 (Pin#19) & Ground (Pin#18) with a Digital Voltmeter to see if the voltage value changes.
I can see the radio is able to receive the signals, as the LED Indicators go flashing, but the voltage value do not change, still 0 V, no matter I press P1 or P2.
Anyone who has experience about this, please guide me a little bit.
Thank you for taking your time to read my post.

 

[ramal121]

First I have to ask, humor me, are you trying to toggle a GPIO by pressing a button on the same radio?

In my experience in addition to the LEDs flashing you get procedural text on the screen to indicate whether the data was received or it has failed. Does yours do that?

 

[dickie757]

Your meter might be too slow. Try analog meter, or connect the coil side of a relay.

 

[hung24p4]

Hi there,

Yes, same radio Mobile.

But if the mode is "Local", then everything is fine, as when I press P1, meter turns 5V, and P2, meter turns 0V.
The mode is "Digital" with "Zone", "Channel" & "Call" as described above, it fails.

So I then proceed to use another Portable Radio to test, same "Zone", "Channel" & "Call".
It ofc can call the Mobile by PTT, but once again fail to enable GPIO via its telemetry button.