Trans-Cal ssd 120-30 Altitude Digitizer - encoder - help

[Coopere]

So I have an original SSD120-30 Altitude Digitizer - Encoder installed in my aztec, its not the newer ssd120-30a or the ssd120-30n model

Im looking for some help on determining where the D4 pin is, I think its pin 1 but its not listed on the case and the closest manual I can find is actually for a ssd120-30a

would anyone have this information handy?

this is the "n" model manual
882188rD.pdf

and here is the "a" model manual
http://www.trans-cal.com/techServ/LegacyMn/881000rD.pdf
neither list my model however, just looking for the Gillham Grey code pin out for "D2" and "D4"

D2 - may not exist on this perticular encoder pretty sure its for high altitude operations

But my gtx327 transponder is suppose to be wired to D4 and im not sure what Pin D4 would be on the encoder

Ill attach a pic of the encoder below sorry its upside down but its buried under the panel
thanks

 

[rowat]

 

[kshaw]

 

[kshaw]

 

[Coopere]

 

[Baker Avionics]