How can I wire up a cable to allow the Magstim Bistim TMS to produce a trigger to start data recording ? What pin number in the Isolated Interface port (26D pin) on the back is the +output for the trigger?
Sorry i'm not familiar with those instruments. Most companies can answer simple questions by phone or e-mail. Lacking that, a sales representative may be willing to stop by and give some advice.
Agreed, contact the company directly. We were lucky enough to have someone who crafted a device to send a command from the trigger box to matlab, but it wasn't quite this complicated. Not worth voiding your warranty.
If you still want to do it yourself, have a look at page 9 of this document http://ced.co.uk/img/signaltms.pdf from Cambridge Electronic Design Ltd. It might help you to make your own connector/adapter cable.
thanks for all the responses. We managed to identify the pin number and have proved our experimental design. I have since purchased a cable from ADi so looking into the future we should have no problems with noise etc.