Additional rs232 commands – Celestron CGEM 1100 User Manual
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Additional RS232 Commands
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1.
Multiply the desired tracking rate (arcseconds/second) by 4. Example: if the desired trackrate is 150
arcseconds/second, then TRACKRATE = 600
2.
Separate TRACKRATE into two bytes, such that (TRACKRATE = TrackRateHigh*256 +
rackRateLow). Example: TrackRateHigh = 2 TrackRateLow = 88
3.
To send a tracking rate, send the following 8 bytes:
a.
Positive Azm tracking:
80, 3, 16, 6, TrackRateHigh, TrackRateLow, 0, 0
b.
Negative Azm tracking:80, 3, 16, 7, TrackRateHigh, TrackRateLow, 0, 0
c.
Positive Alt tracking:
80, 3, 17, 6, TrackRateHigh, TrackRateLow, 0, 0
d.
Negative Alt tracking:
80, 3, 17, 7, TrackRateHigh, TrackRateLow, 0, 0
4.
The number 35 is returned from the handcontrol
Send A Slow-Goto Command Through RS232 To The Hand Control
(note: Only valid for motorcontrol version 4.1 or greater)
1.
Convert the angle position to a 24bit number. Example: if the desired position is 220
, then
POSITION_24BIT = (220/360)*2
24
= 10,252,743
2.
Separate POSITION_24BIT into three bytes such that (POSITION_24BIT = PosHigh*65536 +
PosMed*256 + PosLow). Exampe: PosHigh = 156, PosMed = 113, PosLow = 199
3.
Send the following 8 bytes:
a.
Azm Slow Goto: 80, 4, 16, 23, PosHigh, PosMed, PosLow, 0
b.
Alt Slow Goto: 80, 4, 17, 23, PosHigh, PosMed, PosLow, 0
4.
The number 35 is returned from the handcontrol
Reset The Position Of Azm Or Alt
1.
Convert the angle position to a 24bit number, same as Slow-Goto example.
2.
Send the following 8 bytes:
a.
Azm Set Position: 80, 4, 16, 4, PosHigh, PosMed, PosLow, 0
b.
Alt Set Position: 80, 4, 17, 4, PosHigh, PosMed, PosLow, 0
3.
The number 35 is returned from the handcontrol
4.
Note: If using Motorcontrol version less than 4.1, then send:
a.
Azm Set Position: 80, 3, 16, 4, PosHigh, PosMed, PosLow, 0
b.
Alt Set Position: 80, 3, 17, 4, PosHigh, PosMed, PosLow, 0