I am trying to post a question regarding the ASI290 guider port pin out....when using a ST-4 cable, PHD software gets bad calibration data.
I checked the wiring diagram and find that ZWO guiders, although claiming and illustrating a ST-4 pin out, use totally different pin out than ST-4 protocols on my SBIG guider ST-i.
Actually you are compatible with Orion or Vixen, not SBIG....
My mount is a Takahashi EM-400 with the new guider port and RD-12 communication cable.
SBIG pin 1 +RA
ZWO pin 1 N/C
SBIG pin 2 +DEC
ZWO pin 2 GND
And so on...
Looks like a full cable reversal 1 for 6, 2 for 5, 3 for 4, 4 for 3, 5 for 2 and 6 for 1.
I did not find a place to post this
Which one of us is correct?