Re: Mount Will Not Connect To Computer

Bill Bradford

Hi Howard,

The cables are regular serial cables and are connected male to female. They were not bought as a set. I used two 4 ft. cables just to get the extra length.

But, I am going to get a single cable to replace them.

Thanks for the post.


----- Original Message -----
From: Howard
To: ap-gto@...
Sent: Monday, July 07, 2008 5:05 PM
Subject: RE: [ap-gto] Mount Will Not Connect To Computer

Two reversing or null modem cables hooked together can effectively make
a single straight through cable. The cables would have only worked
when hooked together in tandem, and could not possibly work
individually. Having only one of the cables fail would then leave you
in a fatal situation. An easy test is to check continuity from each
numbered pin to its corresponding numbered hole at the other end of the

Mag. 7 skies!

Howard Hedlund

Astro-Physics, Inc.



From: ap-gto@... [mailto:ap-gto@...] On Behalf
Of Marj
Sent: Monday, July 07, 2008 4:37 PM
To: ap-gto@...
Subject: RE: [ap-gto] Mount Will Not Connect To Computer

Remember that the cables that you use MUST be the straight-thru type. We
now sell 15' cables for the convenience of our customers (so you don't
have to run all over town to find them).

Marj Christen
Astro-Physics, Inc
11250 Forest Hills Road
Machesney Park, IL 61115
Phone: 815-282-1513
Fax: 815-282-9847
Please include this e-mail with your response.

-----Original Message-----
From: ap-gto@... <>
[mailto:ap-gto@... <> ]On
Behalf Of Bill Bradford
Sent: Monday, July 07, 2008 4:27 PM
To: ap-gto@... <>
Subject: Re: [ap-gto] Mount Will Not Connect To Computer

I tried both com ports on the mount and I am using a native serial port
on my computer. I also tried to connect using another computer and had
the same error message.

My set up has two 4 ft long serial cables in series. So, tried each
cable separately to make sure that I did not have a cable failure. I
figured that it is highly unlikely for two cables to fail at the same

I will be back from the dark site tonight and will call you guys
tomorrow or the next day about possible additional testing I can do. I
will do an echo test (as suggested by a group member) using Windows
HyperTerminal to totally rule out the computers and cables. Although, it
also seems unlikely that there would be a port problem on both

At the suggestion of another group member I also tried to connect using
PulseGuide vs. just The Sky. PulseGuide also gave the mount not
responding error message.

The good news is that I am better at using the hand controller now. :>)
Unlike my Tak mount, where the loss of computer control would seriously
limit my ability to get on faint targets for photography, using the AP
hand controller allowed me to image okay with just the additional time
necessary to enter RA and Dec for stars not in the controller's
catalogue. A small price for the ability to image as usual.


----- Original Message -----
From: chris1011@aol. <> com
To: ap-gto@yahoogroups. <> com
Sent: Monday, July 07, 2008 9:28 AM
Subject: Re: [ap-gto] Mount Will Not Connect To Computer

In a message dated 7/5/2008 7:59:45 PM Central Daylight Time,
bcbradford@gmail. <> com writes:

> Last night I had connected my Mach1 (new...have had it for 6 weeks) to
> Sky, as I usually do, and was testing the connection by using the Move

> command in The Sky and everything was doing fine.
> However, after a minute or so of moving each mount axis, the mount
would no
> longer take any command to move it. I removed power from the mount for
> secs or so and tried to connect through The Sky and got an error
> saying that the AP GoTo was not responding.

There are two com ports. Did you try them both? Also, do you have a
with a com port or are you using a USB-serial converter? If so, you
check your converter. The com ports on the mount servo are quite rugged,
and it
would not be logical for both of them to fail simultaneaously, in fact
they do
not fail very often at all. However, a converter can suddenly fail


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