Is the "AFS-Xpndr" the same as the "SV-261", mode S transponder?

I purchased the "AFS-XPNDR", which appears to be a Trigg TT22. All the AFS install documents appear to refer to the SV-261. Of coarse the SV-261 looks a lot like the trigg as well. (I believe the label on mine says "trigg TT22", will need to double check when I go back to the hangar.)
The trigg TT22 install documents are different than the SV-261.

I've connected mine as a SV-261 and I do not get any communication with the AF5600.

For SV-261 (and currently wired):
pin 1 - loop, connect to pin 2
pin 2 - loop, connect to pin 1
pin 5 - serial RX
pin 7 - serial TX
pin 12 - loop, connect to pin 13
pin 13 - loop, connect to pin 12
pin 14 - ground
pin 15 - power


From Trigg TT22 install document:
pin 1 - ground
pin 2 - TMAP1A (possibly serial 1)
pin 3 - TMAP1B (possibly serial 1)
pin 8 - TMAP2A (possibly serial 2)
pin 9 - TMAP2B (possibly serial 2)
pin 14 - ground
pin 15 - power


Clearly there is a difference. Which do I use?




Thanks,
Jeff