PLX SM-AFR Serial upgrade

[joecar]

Thanks for sharing.

[Jayrcr3]

Is this still a necessary mod? Why cant we plug into the Serial TX port like on the LC-1?

[joecar]

I think they now have a serial port... let me research this.

[Jayrcr3]

Thanks Joe. My LC-1 decided to quit, and I replaced it with the PLX. I'm afraid I should have done a little more research.

[JezzaB]

Wow this thread is a flashback!
Looking at the new SM-AFR and M-300 they still run the old TTL level serial chaining so would need a TTL to Serial converter still to push the output levels up to 12v RS232

[Jayrcr3]

I ordered one. Thanks for the confirmation.

[Tre-Cool]

I ordered one. Thanks for the confirmation.

I honestly wouldn't go back to a plx device, there are much better/smaller units available on the market now that offer a direct serial comms wire..

[joecar]

I ordered one. Thanks for the confirmation.

PLX's website indicates that the SM-AFR has digital output...

let me know what you see when you get it.


If it does not have an external serial comms port, then I do apologize, it looks to me like it does.

[joecar]

Look at callout # 5 under Technical Specs:

Wideband-O2-Air-Fuel-Ratio-Sensor-Module-p/897346002726

[Jayrcr3]

It does have serial output, but it's not compatible with EFI Live.

I tried to get it to work, but couldn't get it operational with the serial port. Analog works fine. I ordered the RS-232 TTL converter. It was only $4 bucks, and if I can't get it working that way, I'll just use the analog inputs.

FYI this is the latest version of the PLX SM-AFR, GEN 4.