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UPDATE 5-25-23 THIS CABLE SO FAR HAS NOT CONNECTED. 10k resistor in place and pin E used for data.
2ND UPDTE June 21, 2023 . I believe the failure here was the newer FTDI drivers. It is true that a commercial cable is an easier route to go.
Good afternoon,
The following schematic / pic is for a PC to OBD1 cable that uses uses a Sabrent CB-FT1K RS232 to USB converter (must be FTDI based chipset). The pic has wording "Program to invert TXD and RXD pins" that states the transmit and receive have been reveresed. Is this a function built into the Sabrent converter. The word "program" leads me to think that the windows driver may be used to configure this and "program to invert...... is an instruction by the OP to do this. Can anyone help with this ?? I will have to build one as my several attempts to get the cable online failed. Their system would not accept my Visa card, never had that before. There shipping for a small cable is over $21.00 as well. Several attempts at phone calls did not get through either. Ordering online makes the cable nearly $100. The image is from the Firebird Nation website. The CB-FT1K RS-232 converter looks like it is being phased out, finding them is getting harder.
Thanks
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Last edited by Vets-Vet; Jun 21, 2023 at 08:44 AM.
The Sabrent tech sent me this pinout. In the pic, the cathode is pointing toward the PC so I am guessing that pin 3 is receive and that is why TX RX is reversed ?? Why not just wire them reversed ??
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Below is a USB 2.0 pinout. 3 looks like + data.
As of now this cable in this configuration has not worked for me. It could be a setting in TunerPro or it could be the cable. The invert was in a program called FT_prog that inverted the signal not the pins. 10Kohm resistor is in place and still no data.
Not every adapter can work with the cars baud rate. It has have a genuine FTDI chip set. There are clone chips they call FTDI based. FTDI even warns about them on their website.
It is a Sabrent CB-FTDI, drivers loaded, data inverted, Tunerpro " cable found and functional", 10k ohm resistor installed between A & B. ADS 32B file loaded. KOEO,
"DA connecting ........" but even after appx 4 min nothing. I import an ads file then load definitions and it changes it to an .adx file
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Last edited by Vets-Vet; May 25, 2023 at 06:42 PM.
DIY OBD1 data cable question
