Atlas Copco - Elektronikon MkIII


Thread Starter

Pavel Topic

If anybody know how to communicate with air compressors from Atlas Copco, please help me.
Problem is that communication STOPS after some time( 1 hour to 2 days ) with one compressor, after some time with second and finaly everything is dead.
When communication stops, only power off/on of communication device is help.
Atlas Copco is unable to help with this situation.
They told me that communication stops, when communication buffer is flooded (very robust software).
I send requests every 1500 ms.
That's to slow to flood anything.
There must be another reason to stop.
If you know something, plese tell me.

3 compressors are connected in 485 network.
Every compressor has it's own address (1, 2, 3).
I think that my implementation of MODBUS protocol is OK.
It works with other MODBUS devices without any problems.
Are you using RS-232, Current-Loop? RS-422?

If you have a 4-wire (or 2-wire) RS-485/422 *with-OUT* signal ground, you may have a ground build up. Remember your compressor is a hugh power/noise
device and anything with a "floating" earth near it may have a tenency to build up potential. Use an optically isolated card in your computer & make
sure you run the floating signal ground from this card to the (hopefully) floating signal ground on the MkIII.


Lynn August Linse, Senior Product Application Engineer
15353 Barranca Parkway, Lantronix Inc, Irvine CA 92618
[email protected]
Tel: (949)300-6337 Fax: (949)453-7132
I'm in the need of comunicating to a terminal like you describe via RS232 port. I have no idea yet how i should ask for data to the terminal or what can i do in order to retrive data via 232. Can you help me on how should i work this. I was
thinking on buil a VB aplication to get data from the port...

any idea or information on how can i get information will be usefull.

Thanks in advance