I've been trying to get Astroplanner v1.6.1 to play nice with CDC 
v3.0.1.4, and vice versa.  I haven't been successful in getting AP to 
update the FOV in CDC properly.  The Site info, time, and FOV get 
updated ok in CDC, but not the RA & DEC.  Somehow, the sequence of 
commands that AP sends to CDC results in the RA & DEC getting lost.

I was doing some debugging into this interaction, and found a sequence 
of commands that can be sent to CDC to allow it to work as desired:

Currently, AP sends this sequence of commands to CDC to match AP's FOV 
(I'm using M1 for an example):

SETOBS LAT:+00d00m00sLON:+000d00m00sALT:000mOBS:name
SETDATE yyyy-mm-ddThh:mm:ss
SETRA 5.575548
SETDEC 22.014467
SETFOV 1.045000
REDRAW

This results in CDC correctly changing everything except the RA & DEC 
upon the REDRAW command.

I found that somehow if a SETDATE command is issued in combination with 
SETRA and SETDEC, without a separate REDRAW command for SETDATE, then 
CDC forgets about the new settings for RA & DEC.

After finding this, I found that the following series of command sent to 
CDC do indeed work:


SETOBS LAT:+00d00m00sLON:+000d00m00sALT:000mOBS:name
SETDATE yyyy-mm-ddThh:mm:ss
REDRAW
SETRA 5.575548
SETDEC 22.014467
SETFOV 1.045000
REDRAW

The key here is that a REDRAW command is issued following the SETDATE 
command.  That way the values for SETRA and SETDEC don't get forgotten.

Paul, If you could, this workaround could be an easy tweak for AP v2.0.

Patrick, you probably want to know about it too, and find out why 
SETDATE causes SETRA & SETDEC to be forgotten without a REDRAW.

Thanks,
David Sharp


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