Search:

https://www.quora.com/What-is-the-pinout-for-Canon-550d-remote-switch

Great again thanks, also just found a diagram on the web so it seems as though it is just a switch/pir required
Ps the Trailmaster seems to have an issue and we are unable to set the time etc,...

I have a few PIR switches, the question is does the canon need to have just on/off switching, I guess the three connectors on the plug is on of and hold, if so can I just use my PIR switch to switch...

I have a few PIR switches, the question is does the canon need to have just on/off switching, I guess the three connectors on the plug is on of and hold, if so can I just use my PIR switch to switch...

Brilliant, many thanks, email address on it's way :)

Just a long shot, I found an old TM550 in the cupboard with no instructions, the company seems to have folded and I can not find instructions on the Web, can anyone help?
Thanks
Roger