For those knowledgable about multi-meters and testing electronics...

[rogerg]

I have a fault in my setup somewhere in the chain of:

ST7 -> Guider cable and adaptors -> LX200 CCD Port

The actual symptom is that east movement via the CCD port of the LX200/ST7 produces no response/change in behaviour at all. As if the cable were cut for just that one direction.

I would like to rule out the ST7 by testing that a signal is being transmitted from the ST7 guider port. How can I do this?

I'm familiar enough with my multi-meter to be able to test resistance and power levels coming from batteries and transformers, but I'm not sure how to test if an individual pin in a RJ socket is transmitting an electrical signal.

Anyone know how I do that without blowing the thing up?

Thanks.

[gbeal]

Roger,
I had a similar problem recently.
With Maix, or CCDSoft, (whatever you use, I use Maxim) try the "Move" command. I set about 3 seconds, and id you look through the grill on the back, you should see one of four LEDs light when you move in RA/X RA/Y, and Dec/X Dec/Y. The LED should light if the command is getting to the camera. You don't need the guide cable for this, just the power, and USB plugged into the camera. If all goes well there, the next thing is to try the resistance on the camera auto-guider plug, with a multi-meter.
I will dig out the pins, and what they represent. Shoot me an e mail and we can do this off group, at g.beal@xnet.co.nz
Gary