ASTRO-PHYSICS GTO KEYPAD Uzupełnienie - Strona 5
Przeglądaj online lub pobierz pdf Uzupełnienie dla Keypad ASTRO-PHYSICS GTO KEYPAD. ASTRO-PHYSICS GTO KEYPAD 10 stron. Plus supplemental information for customers outside of north america and the revised gto quick star drift method of polar alignment
Drukuj stronęHorizon Check in the Servo
Command:
Response:
A●bug●was●found●in●the●servo's●internal●horizon●check●in●the●E1●and●KE1●microcontroller●chips●for●the●GTOCP1●and●
GTOCP2●control●boxes.●●The●bug●existed●in●all●prior●versions●of●the●chip.●●Later●versions,●beginning●with●F●and●going●
through●R●partially●addressed●the●issue,●but●it●will●be●version●S●(in●beta●testing●as●of●1-14-10)●that●will●fully●solve●the●
problem.
Since●most●planetarium●software●and●the●Astro-Physics●keypad●firmware●all●perform●their●own●horizon●check●calculations,●
this●command●is●rarely●activated.●●The●horizon●check●was●included●in●the●command●set●for●people●who●may●be●writing●their●
own●control●software.●●
At●this●point,●we●recommend●that●NO ONE SHOULD USE THE HORIZON CHECK in●the●servo.●
Variable Tracking
The●following●text●replaces●the●text●for●these●commands●on●page●87●of●the●v.4.12●keypad●manual●dated●March●7,●
2008●(Appendix●B).●●It●applies●to●GTO●servo●microcontroller●chips●version●G●through●R.●●In●addition●to●a●more●thorough●
explanation,●please take special note of the difference between the northern and southern hemispheres for these
commands.●●●●●Also●note●that●the●command●operates●the●same●in●both●hemispheres●starting●with●version●S.
Command:
Response:
This●command●sets●the●tracking●rate●in●the●RA●axis●("RR")●or●DEC●axis●("RD")●to●sxx.xxxx.●●The●rate●is●expressed●in●terms●
of●multiples●of●the●sidereal●rate●and●can●be●positive●or●negative.●●●●Note●that●earlier●published●text●on●this●command●had●
three●digits●to●the●left●of●the●decimal.●●●This●was●incorrect.●●●Only●two●digits●(not●counting●the●sign)●are●allowed●to●the●left●of●
the●decimal●point.●●●●You●can●use●up●to●four●digits●to●the●right●of●the●decimal.●●●The●format●above●is●correct.
For●the●Right●Ascension,●the●rate●is●added●to●or●subtracted●from●the●default●sidereal●rate●of●1.0000x.●●●If●you●had●the●mount●
set●to●a●different●rate,●like●lunar,●this●is●irrelevant●to●the●command.●●●It●will●always●be●implemented●in●terms●of●the●sidereal●
rate.●●●
This●command●operates●differently●depending●on●the●hemisphere●you●are●in.●●●
● ●
In●the●northern●hemisphere,●the●rate●is●added●to●the●sidereal●rate.●●●For●example,●●●●:RR●+0.1#●●●would●result●in●the●
mount●tracking●10%●faster●than●sidereal●(●1.0●+●0.1●=●1.1●).●●●●:RR●-1#●●●would●stop●tracking●(●1.0●+●(-1.0)●=●0●).
● ●
In●the●southern●hemisphere,●the●rate●is●subtracted●from●the●sidereal.●●●●●Using●the●same●examples●above,●●●●:RR●+0.1#●●
would●result●in●the●mount●tracking●10%●slower●than●sidereal●(●1.0●–●0.1●=●0.9●).●●●●●:RR●-1#●●●●would●result●in●the●mount●
tracking●at●twice●the●sidereal●rate●(●1.0●–●(-1.0)●=●2.0●).
● ●
Starting●with●version●S,●the●command●operates●the●same●in●both●hemispheres●and●follows●the●convention●used●for●the●
northern●hemisphere●above.●●●Also●note●that●Rev,●S●and●later●add●another●digit●to●the●right●of●the●decimal●to●increase●
the●fine●resolution●of●the●command.●●●The●command●is●therefore:●●●●●●●:RR●sxx.xxxxx#
The●variable●Dec.●rate●works●from●a●mechanical●perspective.●●●With●regard●to●the●commands●in●the●servo,●●:RD●+xx.xxxx#●●
will●cause●clockwise●rotation●of●the●Dec.●axis●when●viewed●from●above;●●●:RD●–xx.xxxx#●●will●cause●counter-clockwise●
rotation.●●●●The●pier●side●makes●no●difference,●nor●does●the●hemisphere.●●●●●It●is●better●to●think●in●terms●of●the●mechanical●
rotation●of●the●axis●because●it●is●consistent.●●●●Remember●that●in●the●northern●hemisphere,●on●the●west●side,●clockwise●is●
south;●●on●the●east●side●clockwise●is●north●and●just●the●opposite●holds●true●in●the●southern●hemisphere.●
As●with●the●Right●Ascension,●versions●S●and●later●add●another●digit●to●the●right●of●the●decimal●in●declination.
:ho#
:hq#
(none)
:RR sxx.xxxx#
:RD sxx.xxxx#
"1"
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