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Programming a Minitor Pager on the Cheap - DIY Style Write Up

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NCFire11

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Jul 25, 2007
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607
Essentially all we are doing is connecting the wire coming from the Computer to the programming module like so:

Or would it be reversed?

 

akarsin

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Good afternoon,
I have reviewed this and I must say GREAT WORK, I now have a couple of questions..... I am in an area that is low band, at least for now; inside my apartment coverage is spotty. I have an external antenna setup on my amp charger and this weekend I added a connector to the basic charger to be able to add an external antenna at some point (its still a work in progress.) what I am trying to figure out is if anyone has used their charger base to make a programming base and if so, how did you add the "springs" or metal (copper?) "Fingers" to access the proper pins? Was there any significant redesigning of the board or the existing wide finger (this is the one that would be in position 3 if you look at the above diagram, between GND and RX)

I don’t yet want to butcher my charger, without having at least one as a backup. I have located some of the needed parts, but still working on the rest.


This is a great thread, I’m glad to see that I am not the only one that has beaten their head against the wall over these pagers. My department doesn’t supply them, we need to get our own and having the flexibility to program them is wonderful!

Thanks!!
 

NCFire11

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Ooh, using a post from earlier i found a device that may work.

Using this chip, will it work if i in some way connect the USB to TTL to the bottom of the pager like so:



Maybe find a way to put it into a housing or something.
 

NCFire11

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607
Ok i build mine via a USB>TTL converter build the enclosure and have the wires sticking out as pins, it is for a Minitor III/IV so is there anyway to test it before i spend the money on the software? Thanks
 

wv8mat

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Letart, WV
ok so all i did was take a phone jack, 6 wires, plugged my kenwood mobile cable in and took the ground, tx, and rx wires and put them on the correct places, funny thing is i can read and write to my minitor 3 using dos software, but cant do anything with windows software, keeps say data communications error. so i tried to read my minitor 5, same message. but i can load up my dos software and read and write to my min 3, only thing is i dont know how to use my dos software, very confusing software
 

NCFire11

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Probably something to do with your COM ports, make sure your software and the cable are on the same port.
 

wv8mat

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the software said com 1 and 1200 as the speed, thats what i changed the com port to and still nothing
 

whitesox4life

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Grant Co, IN
i am getting ready to use an old Minitor III charging dock and convert it to a programming dock...do I need to provide power to the pager thru the base during programming?
 

ffighter530

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Mar 2, 2010
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Location
Whitehall
Having trouble

I built this programmer and have tried numerous times to get it to work on multiple computers. Made sure COM was set to 1200 and made sure there was continuity between the pins and their corresponding connections on the radio shack programmer. Has anyone had any luck with this? Help please!
 

fmann

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Mar 4, 2010
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I've tried it several times also with no luck. My USB adapter has a port monitoring function, I can see the PPS program transmit '72' to the pager, and I can see the pager respond with '72', but I still get that comm. error. Tried on several computers, some with a real serial port. Same cable, same pager, same PPS program, so why can some get it to work and others can't? Could the pager have a program lockout function, like a switch inside?
 

sp0tz

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DIY Minitor V Programming Cable

Thanks to this thread i was able to build a functional Motorola Minitor V Programming "Kit", using the Radio Shack "USB Scanner Programming Cable". I ran into some problems early on with trying to use a TRS Jack which was the first mentioned method. I went to the local Radio Shack and picked up one of the DIY project enclosures along with the TRS jack. I wired together the project, held it to my Minitor V, read the codeplug from the radio... alas nothing happened.

Not being easily defeated i decided to try my own method. I'll explain in detail how I did it but first, see my see screenshots below. I had to use my iPhone for the pictures so the quality is not top notch but you can see what was done.

photo1.jpg


First separate the top half of the USB scanner housing. To do this i had to use a flat head screwdriver and pry between where the top and the bottom half of the enclosure met.

Next I used a 30watt iron to heat and remove each of three leads on the one end of the board. Note: this is the side with the Black(ground), Red(TX), White(RX). After removing each of the three leads you may need to heat then quickly tap the circuit board on a hard surface to get rid of the excess solder remaining in each of the holes. De-soldering wick would work if you have some laying around. I didn't so I just tapped it on the table a couple times.

The next step is to use wire cutters to remove one end off of three Alligator Clips and strip the jacket off the ends about 1/8th of an inch. I chose Red, Black and Green so I could easily remember which lead was which.

Now I soldered the exposed ends of the alligator clips into the three holes on the circuit board. The order as seen below from RIGHT to LEFT. (TX then RX then Ground.)

closeup.jpg


At this point I made sure to trim off any excess wire poking through the bottom of the circuit board and made sure my soldering was set and clean. I put the board back into the orange plastic housing and snapped it back together.

Lastly I took three pins from the D-Sub connector (seen below) and clipped them onto the ends of the Alligator Clips.

dsub.jpg

clips.jpg


And done... All of about 25 minutes and you can save yourself $200.00.

Last word:
I am using Windows 7 32bit on my Asus Netbook. I ignored the warning on the USB scanner programming package and had win7 automatically install the drivers for me. Also I have modified the PPS software to allow for engineering mode and changed my single channel voice storage Minitor V into a dual channel voice storage. =)

If you are getting transmission errors when you try to read the codeplug then be sure to follow all of the suggestions mentioned before this post. I had to set my USB delay to 5 seconds before it would work for me. Others have said that 4 works for them. It sounds like it all depends on your setup.

Total cost for me $50.15 versus $250.00 retail cost is outlined below. You might save yourself a little cash if you use the Alligator clip method first. But whatever works, right?

USB Scanner Programming Cable - Catalog #: 20-047: $34.99
Project Enclosure (3x2x1") - Catalog #: 270-1801: $2.29
1/8" 3-conductor TRS Jack Catalog #: 274-249: $2.99
9-Position Male Crimp D-Sub Connector - Catalog #: 276-1427: $2.19
14" (35.3cm) Insulated Test/Jumper Leads Catalog#: 278-1156: $7.69

Please don't hesitate to shoot me a private message with any questions. Please read ALL of the posts before this one for troubleshooting. Thank you to everyone else who contributed!
 

NCFire11

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Jul 25, 2007
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607
Nice guide, maybe you can help me a bit.

I purchased a USB>TTL adapter off of ebay, relatively cheap. It has the following leads coming off of it:
3.3V, TX,RX,GND, 5V. So i rigged up a project box enclosure and everything and set the pins out of it. I tested the pins by hooking up the tx and rx to the 3.3v and 5v instead(just to test). It seemingly worked and i got 5v and 3.3v from the pins coming out of the enclosure.

This is for a Minitor IV btw.

So then i hooked up the tx to tx on my pager and rx to rx and of course gnd to gnd.

Then, using the minitor V pps, and Device Monitoring Studio, i went out to test it. I set the pager on the dock in programming mode and hit read codeplug. The device monitoring studio showed no packets coming back from the pager. I know its a Minitor IV but it still should have shown packets coming back to it?

Also is there any way to check continuity between the pager and the USB>TTL adapter?

Thanks
 

sp0tz

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Mar 4, 2010
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Location
Philadelphia
Nice guide, maybe you can help me a bit.

I purchased a USB>TTL adapter off of ebay, relatively cheap. It has the following leads coming off of it:
3.3V, TX,RX,GND, 5V. So i rigged up a project box enclosure and everything and set the pins out of it. I tested the pins by hooking up the tx and rx to the 3.3v and 5v instead(just to test). It seemingly worked and i got 5v and 3.3v from the pins coming out of the enclosure.

This is for a Minitor IV btw.

So then i hooked up the tx to tx on my pager and rx to rx and of course gnd to gnd.

Then, using the minitor V pps, and Device Monitoring Studio, i went out to test it. I set the pager on the dock in programming mode and hit read codeplug. The device monitoring studio showed no packets coming back from the pager. I know its a Minitor IV but it still should have shown packets coming back to it?

Also is there any way to check continuity between the pager and the USB>TTL adapter?

Thanks

The first thing that comes to mind when reading over the problem you are having is the fact that you are trying to use the Minitor V software with a IV pager. I can't post a link to it here, since its "not free" but with a little research im sure you can locate it. Assuming you have continuity with all of your leads and they are connected up with the USB>TTL it should be working.
 

fmann

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Mar 4, 2010
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I finally got mine to work. What I did was reverse the TX/RX pins going to the pager (Minitor V). I know the schematic mentioned in the first post shows the Data TX (the second hole on the pager) wired into pin 11 of the MAX232 chip and Data RX (the first hole on the pager) wired into pin 12 coming from, and mine was wired exactly like that, but when I reversed the TX/RX wires going to the pager, I got it to work. Maybe this might help someone if this is their problem, it's worth trying.
 

Gary12111979

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Mar 11, 2010
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Location
Pennsylvania , Juniata County
Minitor Programmer

I'm just wondering if you use usb instead of RS-232 to TTL level converter you would just need TTL-232R - USB-TTL serial converter cable and use the wires to wire up inside the program nesting ?
 

whitesox4life

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Jan 5, 2006
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Grant Co, IN
So, i wanna get this right before i ruin a perfectly good Minitor V charging dock. I will be installing a stereo 1/8" jack on the rear of dock.

Ground from jack goes to ground on pager.
TX on jack goes to RX on pager.
RX on jack goes to TX on pager.

Am I correct or did the 2nd post above this confuse me?
 

fmann

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Mar 4, 2010
Messages
4
So, i wanna get this right before i ruin a perfectly good Minitor V charging dock. I will be installing a stereo 1/8" jack on the rear of dock.

Ground from jack goes to ground on pager.
TX on jack goes to RX on pager.
RX on jack goes to TX on pager.

Am I correct or did the 2nd post above this confuse me?


I wired mine up like the various descriptions said, but it would not work until I reversed the TX and RX wires going to the pager. I made my own 'dock', so the description for using the Motorola dock might be different and might not have the same mistake. Worst case, if it doesn't work all you would need to do is reverse the two wires on that 1/8" jack, shouldn't be a huge deal.
 
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