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M7300 DB25 pinout

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ffexpCP

wizard of odd
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I'm trying to inference a M7300 to a Motorola L3276 tone remote adapter.

I'll be using the DB25 off the accessory cable. I've found some info, but it's conflicting. I know I'll have to get PTT programmed (I think pin 21).

Anyone do this before? I'd like to get RX out without getting messed with by the volume knob but I'm not sure that's possible with these radios.

I should be ok with the remote adapter side. I'm just looking for the DB25 connections on the M7300.
 
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DisasterGuy

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Is there a reason you are trying to us a TTA instead of E&M? If so is there a reason for not using a CS7000 with tone board?

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ffexpCP

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Because that's what's on hand. I have an existing m7300 mounted to a power supply. Just trying to make it more useful by marking it more accessible via existing multi base capable tone remote consoles. I can also hide the 'guts' in a secure spot. Less fingers to mess it up.

I don't have the luxury of buying a new control station radio at this time.
 
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ElroyJetson

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Since a CS7000 has the functionality you want, it does stand to reason that you can do what you want to do with an M7300. I suggest that you contact the Harris TAC and request documentation on the back panel accessory ports. This should not be too difficult to obtain.
 

DisasterGuy

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I guess me real question is what functions you are trying to be able to do. Do you need to be able to perform System/Group changes or are you just looking to PTT via tone? Interfacing for E&M is very easy to either the radios DB44 or the DB25 on the option cable's DB25. In reality you can apply this to using an external TRA as well but you will still only get PTT via tone. If you need other tone functions you will need to reverse engineer the CS7000 tone board.

As an aside, I have many M7300 and M7100 stations as control stations for RF Links into our trunked system and I use E&M rather than tone as I can pull direct COR using E&M while tone interface relies on VOX.

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njtaz76

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DisasterGuy, any chance you could PM me (or even put here) information on system/group changing via E&M? I'm not real familiar with E&M but I am trying to work on a simple interface to be able to remotely change talkgroups, etc, as well as get information displayed on the LCD of the radio.

I am specifically using M7100's right now.

THANK YOU!
 
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