Service Forum

[fredrikolsson]

Ok, so I checked on another computer and still get the same voltages :/
My zener diodes are BZX85/C5V1, from the first table of this page: http://www.elfa.se/elfa-bin/dyndok.pl?dok=2016522.htm
And the resistors are 2.2k from this page: http://www.elfa.se/elfa-bin/dyndok.pl?lang=se&vat=0&dok=2012476.htm
Think I should rebuild the interface with new components?

/Fredrik

[victor]

I saw again your pictures and I have an idea:
-try to remove the GND from the DB9 metal cover. Stick only to the COM port pin#5, which is the signal's GND. May sound weird , but the seria l port is using diferential voltage (+/-) and sometimes the PC's GND and the serial port GND is not 100% the same. The port is designed to provide about +/- 10V in respect to pin#5, not the general GND, which is not always the same thing.

Worth a try...
_________________
Victor Voinea
ALLservice HQ, Romania.

[fredrikolsson]

Yeah tried it, F* it, just won't work, pissing me off.

[bob]

May I give you an advice? Build the driven programmer, and you'll eliminate all the problems with the port signals, etc.

[fredrikolsson]

Hi again!
Ok so now I've built the driven interface, I'm not getting 5.1V this time either.
Low of SDA & SCL is 0.32V and high 4.68V. Will this work? (I want to avoid soldering to much on the 24RF08)
I'm using a common ground for all components and pin 5 of the serial port, the negative pole on the three serialized batteries, is this ok?
/Fredrik

[victor]

Is OK for driven i2c programmer (not for SIPROG). Although you must have about 0.6V when low. Give it a try and do not forget the /x /d /i with spaces
_________________
Victor Voinea
ALLservice HQ, Romania.

[fredrikolsson]

Hi!
So it worked hehe, and that's nice..
Huge thanks Victor, for putting up my questions!

[victor]

Ok, the client brings the beers
_________________
Victor Voinea
ALLservice HQ, Romania.

[fredrikolsson]

Quite a bit to drive to romania, I would definately buy you a case of Beck's otherwise