Levenhuk SkyMatic 127 GT MAK - Инструкция по эксплуатации - Страница 16

Get RA-Dec 

E 

34AB, 12CE# 

The finderscope has to be aligned 

Cancel Goto 

M 

# 

Is Goto in 
Progress 

L 

0# or 1# 

0 = No, 1 = Yes. “0” is the ASCII zero character

Is Alignment
Complete 

J 

0# or 1# 

0 = No, 1 = Yes 

HC version 

V 

22 

Two bytes represent Version 2.2 

Stop/Start 
Tracking 

Tx x = 0 
(tracking off) 
x = 1 (Alt-Az 
on) x = 2 
(EQ-N) x = 3 
(EQ-S) 

# 

Alt-Az tracking requires alignment 

32-bit goto RA-
Dec 

r34AB0500,1
2CE0500 

# 

32-bit get RA-
Dec 

e 

34AB0500, 
12CE0500# 

The last two characters should always be zero

32-bit goto Azm-
Alt 

b34AB0500,1
2CE0500 

# 

32-bit get Azm-
Alt 

z 

34AB0500, 
12CE0500# 

The last two characters should always be zero

Additional commands 

Setting the tracking rate via Rs232:

1. Multiply the required tracking rate (arcseconds/seconds) by 4. For instance, if you want to 
track an object at 120 arcseconds/second (approx. 8 times more than sidereal rate), then 
TRACKRATE should be 480.
2. Divide TRACKRATE into two bytes, so that TRACKRATE = TrackRateHighByte*256 + 
TrackRateLowByte. E.g. if TRACKRATE = 480, then TrackRateHighByte = 1, TrackRateLowByte = 
224.
3. To set the tracking rate, send the following 8-byte command:
a. Positive Az tracking: 80, 3, 16, 6, TrackRateHighByte, TrackRateLowByte, 0, 0
b. Negative Az tracking: 80, 3, 16, 7, TrackRateHighByte, TrackRateLowByte, 0, 0
c. Positive Alt tracking: 80, 3, 17, 6, TrackRateHighByte, TrackRateLowByte, 0, 0
d. Negative Alt tracking: 80, 3, 17, 7, TrackRateHighByte, TrackRateLowByte, 0, 0
4. Hand controller returns “35”.

Sending a slow-Goto command via Rs232:

1. Convert the angular position into a 24-bit number. E.g. if the desired angular position is 220°, 
then POSITION_24BIT = (220/360)*224 = 10,252,743.
2. Divide POSITION_24BIT into three bytes, so that POSITION_24BIT = PosHighByte * 65536 + 
PosMedByte *256 + PosLowByte. E.g. if POSITION_24BIT = 10,252,743, then PosHighByte = 156, 
PosMedByte = 113, PosLowByte = 199.
3. Send the following 8-byte command:
a. Az slow Goto: 80, 4, 16, 23, PosHighByte, PosMedByte, PosLowByte, 0
b. Alt slow Goto: 80, 4, 17, 23, PosHighByte, PosMedByte, PosLowByte, 0
4. Hand controller returns “35”.

Resetting the Alt and Az positions

14