Usb to aldl
![usb to aldl usb to aldl](https://s1.manualzz.com/store/data/007492223_1-7f9844eb0a226b3255fc55f5f6d7160c-360x466.png)
and the tech sheet shows a UART on the board (see PDF file). €¢Three different USB plug type provide and please choose only one after payment (default is type A USB plug) €¢Onbard 3.3V regulator, output 5V & 3.3V supply for external circuit €¢576 Byte receive buffer 640 byte transmit buffer €¢Integrated 1024-Byte EEPROM for vendor ID, product €¢Full modem signal with hardware flow control Big question I guess is now has anyone ever tried using this on an OBDI car? How well does the USB to TTL adapter produce the desired 8192 baud rate? From what I have played with, getting the baud rate correct is THE MOST IMPORTANT part of getting the laptop to talk to the PCM.īTW - another adapter that I saw while surfing around: There are some USB to TTL devices out there that would elimate the need for an ALDL cable. The ALDL cables typically have a Max232 chip with some other capacitors, resistors, power supply etc. The car wants a TTL voltage signal (0 or 5 volts) to reprsent the 0's and 1's.
![usb to aldl usb to aldl](https://usbwiringdiagram.com/wp-content/uploads/2019/02/odb2-connector-to-usb-wiring-diagram-wiring-diagram-obd-ii-style-data-link-connector-to-usb-wiring-diagram.jpg)
RS232 kicks out a + or - voltage signal (roughly 3 to 15 volts) to represent the 0's and 1's. so I could be wrong on some of this stuff ) ĭid some more reading about TTL, RS232, the Max232 chip etc. Maybe Paul or someone else might be able to help clarify.
![usb to aldl usb to aldl](http://www.1320electronics.com/Image_12pin_16pin_ALDL_BT_Mk2.jpg)
Is it blind hope that the PCMCIA type design is better than the USB ones?
#Usb to aldl serial
I did see someone mention that they were having luck with megasquirts using this PCMCIA to serial adapter: This brings me to my question of which USB adapter have people had better luck with? I hate to have to keep trying / returning until I find one that works with my laptop. Thus, I am pretty positive it is the USB adapter (already verified COM settings and ports were setup correctly). And yes, this is the same cable, same car, same PCM that everything worked with before. If it does then you can be pretty confident that the Serial-USB converter is not generating the correct baud rate.īut right now, that just isn't an option for me any more (my old laptop was 8+ years old ).Īnyway, found a Prolific USB to serial adapter, and performing the TTS test, shows that the speed is off. I recommend using a real serial port, you may need to get your desktop computer (if it has a serial port) close to your vehicle to test whether the cable works using a real serial port. A Real PC UART chip controlling a real RS232 serial port is capable of generating a baud rate of 8228 which is close enough to 8192 to allow it to work. "Most USB-Serial adapters are not capable of generating the correct baud rate required for ALDL communications. I know Paul has said get a real serial port (found on another post about getting a cable to work ( ) Just upgraded laptops and have finally had to deal with the dreaded USB to serial adapter woes.