Wiring gtm 25 tmc usb connector
Hi,
I like to put a new mini usb connector on the TMC / charger cable since the old one came of. I know that I need a 5 pole mini usb connector, put 1 on 5volts, 4 and 5 on ground. But I dont know which way around to put the green and white data wires on contacts 2 and 3 on the mini usb plug. On the TMC receiver there are 7 pads:
1 ground black
2 n/c
3 data green
4 data white
5 n/c
6 n/c
7 +5volts.
Can anybody check with a continuitytester where green and white go ?
Does anybody know the correct wiring ?
Please help. A new cable with tmc costs almost as much as a new gps.
Thanks, Manfred , Berlin
2条评论
I have the same problem. However, there is no black wire but a yellow wire with light green dashes. Is that the same as the black wire>
由 John Guterman 完成的
There are several versions of the TMC receiver. The one I had was a GTM 25. In the cable from the receiver to the Nüvi mini USB plug there should be 4 wires.
plugpin1 red +5V
plugpin 2data white
plugpin 3 data green
plugpin 4 has no wire
plugpin 5 black ground
you could check with an voltmeter to find the ground wire for the 5 volts (check against red) or with an ohmmeter, since the ground wire is routed through to the cars lighter plug. I dont know if the little current an ohmmeter uses can damage anything.
If you found and connected the red wire and the ground wire the Nuvi should be powered, probably showing a USB connection symbol when pin 4 is not connected.
dont forget to install the 27 k resistor in the plug from shield to pin4 to tell Nuvi that a receiver is connected.
Manfred
由 dl7utx 完成的