Daytson T7M ST4 port not working

[kman42]

Hi, I'm trying to setup an autoguiding rig using a daytson t7m camera, PHD2 and an Arduino. I have gotten PHD2 to get an image from the t7m, so the camera is working, but I can't get any response from the ST4. I have selected On-camera as the mount, and have tried manual guiding while testing the ST4 cable with a multi meter, testing for continuity. I cant get any continuity from the st4 cable. Is there anything I'm missing?

[Dr_Ju_ju]

Lot !!   how is the Arduino connected to the computer ??   and have you programmed it to do what you want ? if you can give a sketch of what you're trying to achieve, with all connections.....

[kman42]

The Arduino will not be directly connected to the computer. As I understand it, PHD2 sends commands back to my camera (setup as an "on-camera mount" in PHD2). The Camera should output commands through the ST4 cable, which I am intercepting with the Arduino. The Arduino will then have a sketch to take the ST4 commands and output a signal to the stepper motor driver. But I am stuck at the ST4 >> Arduino part because the ST4 doesn't seem to be doing anything. 

[Dr_Ju_ju]

no, you'd just plug the ST4 output from the camera, directly into the ST4 port on the mount.... 

[kman42]

I don't have a mount to plug into.  It's a DIY setup using an EQ5 and stepper motors. 

[Dr_Ju_ju]

Then the ST4 camera output would 'drive' whatever you are using to drive the stepper motor....

Have a read through this site https://www.astroeq.co.uk/tutorials.php  its what I used to make my EQ5 fully goto etc. In theory you could just use the RA section.....

[kman42]

The problem is I'm not sure my St4 port is working

[michael8554]

You may not have a big enough step set in the PHD2 Manual Move to perceive movement, try 5000.

Michael