question about grounding RS232

[rossi46numberone]

Hi,
I have read in an other topic that the EC18-pin 17 is internally grounding for convenience.
Does this output can be use for grounding the RS232;or is better to go EC36-pin 26?

Michele....

[gunni]

measure if it connects to EC36-25 the sensor ground, if so then its fine

[mattias]

If you have a knock chip, but not using it, then you can use the knock signal ground as RS-232 (serial port) ground.

[boostd audi]

it should ground to pin 26 not 25  ;)

typo