What I find interesting is that just chopping of the DIN plug at the "Product" end of an S-Lead cable and soldering on a new connector; does not make it an M-lead as there is also a difference within the DIN plug at the "DSP" end.

S-Lead DIN(5-180) has the "signal" wire connected to both pins 1 and 5.
M-Lead DIN(5-180) has the "signal" wire connected to only pin 5.

Anyone know why?

I assumed pin 1 was connected or not so that the DSP could distinguish between having an M or S lead plugged in. Of course with advent of BNC comms connectors there is no scope for different wiring so may be the pin 1 connection is historical and is redundant these days and can just be omitted.

I wish I new more on how M-Comms worked, I have always assumed it is based on a "Multi Drop" serial communication standard like RS423.

Regards,
Carl



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