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Nx-5700 rj45 pinout

wruv983

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Nov 7, 2022
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I have searched high and low and have not found the rj45 pinout for nx-5700. It supports full speed USB programming so one would think there is USB pinout with a 5v sense for USB instead of ttl.

Does anyone here have this? Interested in making my own cable vs buying one.
 

AK9R

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From the NX-5900 service manual. I assume the NX-5700 would be the same. The data at the mic jack could be RS-232 serial since RXD and TXD are mentioned. There's probably a serial to USB converter in the cable.
1692106335821.png
 

wruv983

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Nov 7, 2022
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Hi AK9R,

This is as close as I've gotten but the nx-5### series can use USB mode kpg-46xm cable which eliminates the TTL conversion and allows full speed read and write. So I'm theoretically believing it has USB pinouts and one of the pins is really mode select based on if it receives 5v or not and converts from TTL to USB. Kind of like Motorola xtl and others do.

I can't find any info on it or the kpg-46xm cable to see how it functions or reverse engineer it. Perhaps someone has that cable to check?
 

wruv983

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Nov 7, 2022
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Update, the above from the X works perfectly and the speed is insanely faster than TTL as expected. Thank you agian!
 

AM909

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VBUS goes to VBUS-DET and the other three to the same name, right?
 

kd4efm

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just fyi, the XM cables have a USB and UART switch. UART for the older radios, and USB for the 5k, 3k and VP models (except the 8K in other threads as noted)
 
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