ASTRO-PHYSICS GTO KEYPAD Addendum - Pagina 2

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July●of●2008●will●have●v.4.15.●●Keypads●shipped●between●July●and●October●of●2008●will●have●v.4.16●and●should●be●

re-programmed●to●v.4.17.●The●following●applies●equally●to●all●three●versions:●v.4.15,●v.4.16●and●v.4.17.●●For●simplicity,●

most●references●from●this●point●on●will●be●to●v.4.17●only.

Starting●in●March,●2008,●Astro-Physics●customers●began●receiving●GTO●keypads●that●had●been●programmed●with●a●new●

version●of●our●keypad●firmware.●●●This●new●keypad●version●–●v.4.15●–●and●its●immediate●successors●–●v.4.16●and●v.4.17●

-●address●some●of●the●issues●that●have●faced●customers●in●eastern●time●zones.●●●Other●issues●pertaining●to●southern●

latitudes●were●addressed●in●the●latest●ROM●chip●version●in●the●GTOCP3●control●box:●the●"Q"●chip.●●●(Only●people●using●

their●mounts●in●the●southern●hemisphere●need●the●"Q"●ROM●chip.)●●●In●terms●of●operation,●version●4.17●is●identical●to●

version●4.12,●and●the●manual●included●with●the●keypad●is,●in●fact,●the●v.4.12●Keypad●Manual.●●●This●supplemental●document●

will●explain●the●differences,●as●well●as●the●limitations●and●remaining●issues●with●this●new●firmware.●●●We●anticipate●that●all●

remaining●issues●will●be●resolved●in●the●next●major●firmware●release●which●will●be●v.4.20.

Some●of●the●discussion●below●may●not●make●sense●to●new●users●of●the●Astro-Physics●GoTo●Servo●System●who●are●not●

already●familiar●with●keypad●operations.●●●We●have●therefore●included●references●to●the●pages●of●the●v.4.12●manual●where●

the●related●operations●are●explained●in●detail.●●●If●you●are●new●to●our●system,●it●is●suggested●that●you●read●the●entire●

"Getting●Started"●section●of●the●manual●before●worrying●about●any●of●the●details●below.

Special Notice to Mach1GTO, 1600GTO and 3600GTO Owners

Version●4.17●is●based●on●v.4.12,●which●was●developed●before●the●introduction●of●the●Mach1GTO,●the●3600GTO●or●

the●1600GTO●German●Equatorial●Mounts.●●●In●the●2●=●Setup;●●●4●=●Park●/●Mount●Opt.●menu,●there●are●no●choices●for●

these●newer●mountings.●●Your●keypad●has●been●set●to●1200GTO.●●●This●is●the●correct●setting.●●●The●parameters●for●the●

Mach1GTO,●900GTO,●1200GTO●and●1600GTO●are●all●identical●with●respect●to●the●keypad.●●●Either●the●900●or●1200●setting●

will●work●fine.●●Do●not,●however,●set●the●keypad●to●either●400●or●600E.●●●

The●keypad's●900GTO●or●1200GTO●parameters●are●also●correct●for●the●3600GTO.●●●However,●bear●in●mind●that●the●slew●

rates●and●the●two●fastest●button●rates●on●the●keypad●display●need●to●be●cut●in●half●to●accommodate●the●slew●scaling●that●

is●in●effect●in●the●3600GTO.●●●●Slew●rates●of●600X,●900X●and●1200X●become●300X,●450X●and●600X.●●●●Likewise,●button●

rates●of●600X●and●1200X●become●300X●and●600X.●●●The●slower●button●rates●are●NOT●affected.●●●Enjoy●your●Astro-Physics●

GTOCP3●Go-To●Servo●Drive●System!

Summary of Remaining Keypad Issues:

● ●

Slightly●inaccurate●eastern●longitude●values●are●still●being●sent●to●the●mount.●●Accuracy●has●been●improved●to●within●

+/-●an●arc●minute.

● ●

Western●longitudes●with●eastern●time●zones●–●a●remaining●issue.●●We●suggest●operating●on●GMT●with●no●offsets.

● ●

Polling●the●Mount●(3=Get●Time/Loc●FrMnt●command)●returned●incorrect●GMT●offset●values

● ○

General●issue●resolution●for●most●users.

● ○

Special●problems●with●time●zone●zero●and●west●longitudes

● ○

Issue●with●time●zone●12●East●and●Daylight●Savings●Time

● ●

Longitude●limit●for●people●near●180°●East●Longitude

● ●

Dealing●with●the●International●Date●Line●and●fractional●time●zones

Eastern Longitude Values

(see pp. 14-16) ●Keypad●v.4.17●will●give●the●mount●a●more●accurate●value●for●your●eastern●longitude●than●v.4.12.●●The●

servo●only●accepts●longitude●values●as●west●values,●so●the●keypad●must●convert●your●eastern●longitude●to●a●western●

value●by●subtracting●it●from●360●degrees.●●●In●v.4.12●and●all●previous●versions,●only●the●degrees●were●subtracted●while●the●

minutes●and●seconds●were●ignored.●●●This●could●result●in●up●to●almost●a●2●degree●error●in●the●longitude●in●the●servo.●●V.4.17●

now●also●takes●the●minutes●into●account●by●subtracting●from●359°●60'.●●●There●was●not●sufficient●memory●space●in●the●

relevant●sector●to●also●account●for●the●seconds●without●a●major●re-allocation●of●the●code,●so●the●full●fix●will●be●accomplished●

in●v.4.20.●●●

For●this●version,●it●is●recommended●that●those●of●you●in●the●east●round●your●longitude●to●the●nearest●minute,●and●enter●

zeros●in●the●"seconds"●field●when●entering●your●location●data.●●●With●v.4.17,●the●mount●will●not●receive●any●"seconds"●data●

from●the●keypad●at●all.●●●This●ONLY●applies●to●eastern●longitudes.●●●Latitudes●and●western●longitudes●can●be●entered●

normally.●●●DO●NOT●try●to●enter●your●eastern●longitude●as●a●western●longitude●by●doing●the●arithmetic●yourself.●●(Actually,●