Hi Laurence,
The blinking you see indicates the 5 baud wake up signal being sent on the L line. The wake up starts as soon as you start the software and repeats until the ECU in the car responds. You should see a 2 byte response from the car on the K line. These 2 bytes should appear on the rx line if everthing is working.
At first glance, Andy's interface would appear to work but you would have to change the jumper so that it operates in "rcv always" mode. The software expects that the tx and rx lines are connected so ever character it sends is echoed back.
-doug
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