If you capture the codes as Anand suggested, I think you will find they are substantially different from what is described in NexaProtocol.txt. The Elro AB600 and Intertechno are among those that use the Arc Technology hardware. Those protocols agree with NexaProtocol.txt as far as A=0000, 1=0000, etc. but the wave shapes differ significantly from the shapes in NexaProtocol.txt. As I recall, the codes I have for Elro AB600 and Intertechno tested OK using a European Pronto (433.92MHz) to send the RF codes.