Modifying an OBDLINK SX USB Adapter for HS/MS-CAN relay managed by RTS

[Harwes]

How to recognize if your interface is original or from China. I bought in Poland and I paid a lot of green color

What interface did you buy?
I tried several cheap and expensive adapters until I bought Polish Viaken STN 2120 and it's the best green interface. Upon updating the firmware in the STN2120 chip to v5, it is fast, free of errors, freezes and crashes.

https://viaken.pl/pl/polski-elm327-v4-i ... 0-usb.html

[Pofi87]

Hi. So i fitted the mod whats in the pdf ,relay etc... To the red board using pin 16 rts , if its on automatic , and plug it in to usb relay clicks 3 times bit delay than other 3 , but when i plug it in to the car( Mondeo mk4 2.0 tit x) everything goes mad , engine malfunction , aircon on off,start button not operating , i checked all connections and wires in it ,everything fine according to the manual , Funny thing if i plug it in to a renault and swich it whit the override switch to hscan it works fine , but if i leave it on hscan and plug it to ford same madness happens , before the mod it was working fine on hs , forscan recognise the adapter but wont see the car. Can someone help ? Is it something whit the rts line ? Thanks