In SX Microcontrollers, SX/B Compiler and SX-Key Tool, XGen wrote:

Thanks for the reply and links Steve,

I should have said that I want to monitor the S-Bus, or ST Interface. 
That is ALOT simpler than the U interface.  I know in some contries the U interface belongs to the Telco and you may not place any equipment on it. 

I should go and read  ITU Recommendation I.460 to see exactly what voltages I will be getting on the line.
Oh and i'm mistaken its 192kbits/sec not 144 as i said.

How would you go about connecting this setup to the SX ?
Would you implement the reading of the lines in a IRQ ?

Thanks once again
X

I've implemented an E1 logger, but that was simple. I used 2 LIU from Dallas to do all the hard work. They just spit out 1's and 0's

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