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XPR 4550 Homebrew Programming Cable

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KG4INW

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OK, with a standard USB cable, Green goes to pin 1, White to pin 2, Red to pin 3 and Black to pin 4. Of course, you'll need a PMLN5072A accessory plug kit with pin tips.

I made up a cable according to the instructions given earlier in this thread by KG4INW and it didn't work. Computer didn't recognize the device. So I reversed the data+ and - lines (green and white wires) going to pins 1 and 3 and it worked. So the pinouts for my cable are as follows:

White Data - Pin 1
Green Data + Pin 2
Red Vbus Pin 3
Black ground Pin 4

Looking at the back of the radio the connector facing you the pins are as follows:

Upper left side of the connector is pin 2
Lower left side of the connector is pin 1
Pin 4 is next to pin 2
Pin 3 is next to pin 1
FWIW, I double-checked my cable (along with several factory cables) and it matches what I initially posted. No big deal though, as you said you got yours to function properly.
 

KA9JYO

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Mar 14, 2010
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Ft Myers, FL
pin numbers

OK, with a standard USB cable, Green goes to pin 1, White to pin 2, Red to pin 3 and Black to pin 4. Of course, you'll need a PMLN5072A accessory plug kit with pin tips.

If you want external speaker audio (useful for the XPR8300/8400 repeaters since this is the cable they use) those are pins 9 and 10. Ignition is 25

According to Motorola USB standard is: pin1 (data+, white)
pin2 (data- , green)
pin3 (5VDC, red )
pin4 (ground, black)
 

kd6w

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Dec 28, 2015
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Menlo Park, CA.
I replicated your original results.

FWIW, I double-checked my cable (along with several factory cables) and it matches what I initially posted. No big deal though, as you said you got yours to function properly.

I believe the difference is which end was which. I used an old USB cable from an old SONY camera and the USB B connector was the computer side and the side I cut was the appliance side. Had it been reversed I speculate the wire flip would have been necessary.

Thanks for the PIN #1 information! When I plugged the USB into my laptop the USB driver installation window indicated "Motorola Solutions LTD Device" (yeah!). On a whim I reversed the pins and Windows shut down the port as expected. 73 de KD6W
 

n2hbx

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Dec 23, 2004
Messages
309
Location
Lady Lake, FL
Question to anyone on the thread : I have the USB (HKN6184C) & RS232 (HKN6183B) GCAI Cables for the ASTRO25 series mobiles

I've seen on marketing material around the Internet that these also work with the TRBO mobiles.

Has anyone here personally tried programming a TRBO mobile with either of these cables?

Thanks!

-Patrick

The USB GCAI cables for XTL, APX, and TRBO mobiles are totally interchangeable. The RS-232 versions are a crapshoot. I have had them work on some radios and not on others. I would stick with the USB versions.

Larry
 

ve1bxk

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Aug 5, 2009
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Parrsboro, NS
Programming Cable

I have attached photos of the USB to 26 pin female Motorola Connector # PMLN5072A. This one does work.

73, Lorne
 

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