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Unity XG-100M change head from 721 to 100

redbeard

OH, PA, WV Regional Admin
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Feb 5, 2003
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Greater Pittsburgh/Beaver County
My unit came as a 721 remote head and I have changed it to a radio mounted ch-100. Getting the 'lost mru' message. I can see the head with RPM14 via USB, and I have read the radio via serial and have it's 721 personality. I thought it might be as easy as changing radio type to CH100 and writing back but that fails. The head has R06J03 and the radio R03B06 (RPM 7) so I imagine those need to match. Any guidance for a Moto guy's first stab at Harris? My initial guess is that I need to find R03B06 for the head and write it. Then I can try writing the radio again via USB.
 

snoopyII

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Jan 25, 2007
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On the other side of the tracks
Other way around - you need to find R06J03 for the MRU. You have a pretty decent mis-match of firmware between the head and RF deck. This can occasionally cause some weird things to happen. That being said - the firmware is probably not your problem. You need a CAN terminator on the back of the RF deck. Once that is in place, you will need to read/write via USB on the CH100, you can no longer program via serial on the back. BTW "LOST MRU" is basically the equivalent of FL 01/90.
 

redbeard

OH, PA, WV Regional Admin
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Hmm seems it was the terminators all along. I powered it on after installing them and it came right up. I was able to read via serial, then change radio type and program via USB. Seems all good for now. Wouldn't have guessed those were an issue on a dash mount. I probably still want to find XLPR06J03 and update the MRU if I can.
 
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