Minitor III , IV and V

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xxx2fan
Posts: 84
Joined: Mon Oct 31, 2005 4:42 pm
What radios do you own?: HT750 Ht1250 CDM1250 CDM1550

Minitor III , IV and V

Post by xxx2fan »

If someone knows the pinout from the bottom of these minitors could you post it for me and if someone has had good luck making program stands and the pin connections to the minitors could you please contact me and maybe send me a few pics of what you had sucess with
thanks I am making the simpler max232 version of UPI and am going to need stands for the above minitors. thanks for any help
aaknitt
Posts: 182
Joined: Wed Oct 05, 2005 1:17 pm

Post by aaknitt »

See this thread:

http://batboard.batlabs.com/viewtopic.php?t=50263

I made a very crude connection by bending three pieces of stiff wire and screwing them to a piece of wood. Not elegant at all, but it worked. Here's the programming pinout for the MIII. I assume the others will be the same:

Pin 1 (closest to battery cover)
Pin 2 GND
Pin 3
Pin 4 Pager RX from UPI
Pin 5
Pin 6 Pager TX to UPI

The Batlabs Minitor page has the full pinout if you need more than just the programming pinout. Also, as was discussed in the other thread, you don't need to worry about building the 1.5V supply portions of the programming interface if you don't want to. All you need is the MAX232, the comparator, and the 5V supply to power those two chips.

I'm trying to figure out a way to build a more elegant programming stand, but I haven't given it a lot of thought yet.

Good luck!

Andy
aaknitt
Posts: 182
Joined: Wed Oct 05, 2005 1:17 pm

Post by aaknitt »

Just an update on my programming stand work. I took a standard charger and added two additional pins in the correct locations. I happened to have some pins that fit almost perfectly, but it took a little bit of hacking inside the charger to get the spring contacts moved to the appropriate positions. The charger has a couple extra spring contacts in it (I have no idea why, but I'm not complaining!), but I had to move them to the correct positions, which meant cutting away part of the circuit board. I then added a 3.5mm audio jack so I can plug my homebrew UPI into the charger whenever I want to use it as a programming stand.

Andy
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