How can I talk only to one ECU in a two ECU Car with ELM237 and OBDII : <p>I am sending following ELM237 commands to a Porsche Cayenne.
There are two ECU on the Bus 7E9 and 7E8. I would like to address only one at a time. I thought I can do that by using atsh7E8 to 
talk only to one but then the answers contain only the string 'NODATA'.
I guess I miss something here to filter one ECU at a time. Does somebody have an idea?</p>

<pre><code>Request/Response
[atd, OK],
[atl0, atl0OK],
[ate0, ate0OK], 
[ath1, OK], 
[atsp0, OK],
[ats0, OK],
[atat1, OK],
[ate0, OK],
[0100, 7E9064100981880017E8064100BFBEA893],
[0120, 7E8064120A007B1197E906412000000001], 
[0140, 7E8064140FED085007E9064140E0800000],
[atdp, AUTO,ISO15765-4(CAN11/500)],
[0900, 7E9064900144000007E806490055400000],
[0902, 7E810144902015750317E821414332413231477E8224C413839303838], 
[010C, 7E904410C09607E804410C095C],
[010D, 7E903410D007E803410D00]

</code></pre>
