# PL detect with CM108 or CM119 fobs?

**URL:** <https://community.allstarlink.org/t/pl-detect-with-cm108-or-cm119-fobs/22780>\
**Category:** Archive\
**Created:** [January 25, 2025, 10:56pm UTC](https://community.allstarlink.org/t/pl-detect-with-cm108-or-cm119-fobs/22780 "2025-01-25T22:56:27Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![Mike](https://community.allstarlink.org/user_avatar/community.allstarlink.org/mike/32/1569_2.png) [@Mike](https://community.allstarlink.org/u/Mike)\
**Post date:** [January 27, 2025, 4:56pm UTC](https://community.allstarlink.org/t/pl-detect-with-cm108-or-cm119-fobs/22780/6 "2025-01-27T16:56:00Z")

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> [@DrMarc](#):
>
> Following nice KK9ROB write-up, the transmitter does not activate when RPT\_KEYED is set.

I believe that is a status readout and not settable item. (no soft toggle)  
Otherwise this would have been solved a long time ago.

The way to solve this may best lay with a I2C device as was intended for a Pi channel driver that never made it to production.

[Raspbery Pi and DMK eng PITA board](https://community.allstarlink.org/t/raspberry-pi-and-dmk-eng-pita-board/20501)

But something should be done soon as we will run out of options sometime.  
We have been using the same URI sceme based on a sound fob for more than 15 years and that sound fob was not a new thing then.  
I use a pc with parallel port interface for signalling so I can use more sound fobs than those using a URI.  
But even PC motherboards with PP interfaces have run out as well and I have a supply of them for myself. I’m likely good for as long as I do this. ‘USB printerport’ devices will not work as they cannot be ‘bit banged’ .  
But there is this as well.

> **[bit-bang-usb.pdf](https://www.dlpdesign.com/images/bit-bang-usb.pdf)**
>
> 356.93 KB

Or to allow

RPT\_KEYED

to be a addressable settable item. Then we can write our own external triggers for it.  
I prefer the later. Then the base code is not so ‘dated’.

But to use that event, you have to code a phone tx event (\*99) to engage the TXer (COS ). and I don’t think you get a CT with that method, but it’s been a long time since I tried it.

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