Tech 2 RS232 Loopback plug

**SubnetMask** · 16th November, 2009, 01:40 AM

Does anyone happen to know the pinout of the RS232 RJ45 loopback plug that comes with the Tech2? If you have it, the loopback for the RS485 would be helpful as well.

Thanks!

Edit: Never Mind, I found a picture of a "Tech 2 Loopback Plug" and made one that works, and from that one, guessed at the RS485 plug which also worked. however, if anyone would happen to have the proper punout if the DB9 > RJ45 cable for the Tech 2 so I could verify that mine is correct, it would be appreciated.

If anyone's interested, here's the info:

RS232/RJ45:
1 <> 8
2 <> 7
3 <> 6
4 <> 5

RS485:
1 <> 6
2 <> 5
3 <> 4

**Zwitter** · 14th December, 2009, 11:57 PM

in the RS485 should it be to wires going from pin 2 to pin 4 and 5 or is it a type misstake that should be 3-4 instead of 2-4 according to your info

//Zwitter

**SubnetMask** · 15th December, 2009, 12:36 AM

Originally Posted by Zwitter

in the RS485 should it be to wires going from pin 2 to pin 4 and 5 or is it a type misstake that should be 3-4 instead of 2-4 according to your info

//Zwitter

I'm an idiot... Typo fixed. Thanks for the heads up.

**Zwitter** · 15th December, 2009, 11:07 AM

Originally Posted by SubnetMask

I'm an idiot... Typo fixed. Thanks for the heads up.

Glad to be of some help, Your not an idiot. I'm ever so glad to have found this info. TECH 2 original equipment cost a futurne. I just want to be sure before I make theese connectors. Don't want to fry my very presious TECH 2.

Do you know the pin-out for the DLC loopback connector. Think that would be handy too.

//Zwitter

**SubnetMask** · 16th December, 2009, 04:33 AM

Originally Posted by Zwitter

Do you know the pin-out for the DLC loopback connector. Think that would be handy too.

//Zwitter

That one I don't know... To be honest, I'd recommend looking on ebay for one of those; Not sure how you'd make it with the specialized connectors; GM Dealer Equipment lists them new (dealer Price) for about $49, so I would think you could find them for a similar price (maybe less) on ebay.

**Zwitter** · 12th May, 2010, 10:32 PM

looking for the pinout for the Tech 2 DLC cable. 26 d-sub connector to the VLC in the TECH 2 and the 19 pin connector that hooks up to various vehicle specific adapters.

Must appriciated if anyone knows this

**cbeerman** · 26th August, 2010, 04:10 AM

https://www.gmtraining.com/tmswebtre..._T2test_r6.pdf

**Bllinda** · 11th April, 2011, 01:06 PM

Originally Posted by SubnetMask

Does anyone happen to know the pinout of the RS232 RJ45 loopback plug that comes with the Tech2? If you have it, the loopback for the RS485 would be helpful as well.

Thanks!

Edit: Never Mind, I found a picture of a "Tech 2 Loopback Plug" and made one that works, and from that one, guessed at the RS485 plug which also worked. however, if anyone would happen to have the proper punout if the DB9 > RJ45 cable for the Tech 2 so I could verify that mine is correct, it would be appreciated.

If anyone's interested, here's the info:

RS232/RJ45:
1 <> 8
2 <> 7
3 <> 6
4 <> 5

RS485:
1 <> 6
2 <> 5
3 <> 4

Who can confirm or deny that the RS485 connector and learning, is bound by the following