Celestron 21020 통신 프로토콜 매뉴얼 - 페이지 2

{카테고리_이름} Celestron 21020에 대한 통신 프로토콜 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Celestron 21020 8 페이지. Nexstar hand control

페이지 인쇄

GOTO precise AZM-ALT

Sync

To Sync to an object via serial commands, the user should center a known object in an eyepiece. Then the Sync serial

command should be sent, using the celestial coordinates (RA and DEC) for that object. This causes future GOTO or

Get Position commands to use coordinates relative to the Sync'd position, improving pointing accuracy to nearby

objects. (we probably don't need to mention "from the planetarium package" since it also improves pointing accuracy if

they GoTo objects via the hand control.) The format for the RA/DEC positions in the Sync command is identical to the

GOTO RA/Dec command.

Command Function

Sync RA/DEC

Sync precise RA/DEC

Tracking Commands

The following commands retrieve or set the tracking mode.

Depending on the mount type, following tracking modes are available:

0 = Off

1 = Alt/Az

2 = EQ North

3 = EQ South

Note: On the CGE and Advanced GT hand control versions 3.01 through 3.04 the value for EQ North is 1 and EQ

South is 2. This has been corrected to match the other models in current hand control versions.

Command Function

Get Tracking Mode

Set Tracking Mode

Slewing Commands

The following commands allow you to slew (move) the telescope at fixed or variable rates.

For variable rates, multiply the desired rate by 4 and then separate it into a high and low byte. For example if the

desired tracking rate is 150 arcseconds/second, then:

trackRateHigh = (150 * 4) \ 256 = 2, and

trackRateLow = (150 * 4) mod 256 = 88

For fixed rates, simply use a value from 1-9 (or 0 to stop) to mimic the equivalent hand control rates.

Note: in most configurations, issuing the slew commands will override (or conflict with) the tracking mode of the

mount. Hence it is always best to disable tracking first using the Tracking Commands, issue the slew command, then

re-enable tracking. The main exception to this is when tracking equatorially - the fixed rate slews at 1 or 2 will not

override tracking. This can be useful to simulate autoguiding.

Note: on GT models, the fixed rate slews at rate 9 move at 3 degrees per second instead of the maximum rate.

"b12AB0500,40000500"

PC Command

"S34AB,12CE"

"s34AB0500,12CE0500"

PC Command

"t"

"T" & chr(mode)

"#"

2.2+

Hand

Applies to

Control

Versions

Response

"#"

4.10+

"#"

4.10+

Hand Control

Response

chr(mode) & "#"

"#"

Applies to

Versions

2.3+

1.6+