-3-
problem for imaging. Not only does the pause
move the target off center (blurring the image), it
makes it extremely difficult to accurately return the
target to the desired position. Returning the target
to center with MTSCP commands can only be
accomplished by purposely overshooting the
eastward slew to account for the following
tracking pause. Obviously, this makes guiding
with MTSCP commands during imaging infeasible.
How Do Problems with Firmware
Implementation of MTSCP Affect
Autoguiding?
In order to understand how these problems affect
attempts at software-driven autoguiding using
MTSCP commands sent via the LX200GPS RS-
232 port, it is necessary to consider how
autoguiding is performed. Briefly, autoguiding
software performs the following tasks:
1. Locate the centroid of a guide star in an image
frame (from the guide camera)
2. Calculate how far the centroid is (in the x- and
Commands that work correctly in firmware 2.0i and 3.0d
:Mn# Move telescope north at current slew rate
*
:Ms# Move telescope south at current slew rate
*
:Me# Move telescope east at current slew rate
*
:Mw# Move telescope west at current slew rate
*
:Q# Halt all current slewing
*
:Qn# Halt current northward slewing
*
:Qs# Halt current southward slewing
*
:Qe# Halt current eastward slewing
*
:Qw# Halt current westward slewing
*
:RC# Set Slew rate to Centering rate (2nd slowest)
:RG# Set Slew rate to Guiding Rate (slowest)
:RM# Set Slew rate to Find Rate (2nd Fastest)
:RS# Set Slew rate to max (fastest)
:RgSS.S# Set guide rate to +/- SS.S to arc seconds per second. This rate is added to or
subtracted from the current tracking. Rates when the CCD guider or handbox
guider buttons are pressed when the guide rate is selected. Rate shall not exceed
sidereal speed (approx 15.0417”/sec)
:STtt.t# Sets the current tracking rate to tt.t hertz, assuming a model where a 60.0 Hertz
synchronous motor will cause the RA axis to make exactly one revolution in 24 hours.
*
Although these commands work correctly, guiding motions requested by these commands (e.g., :Mw# :Qw#) are
followed by a pause in tracking with firmware version 2.0i. The pause does not occur in firmware 3.0d.
Commands that do not work in firmware 2.0i and 3.0d (and probably other versions)
:T+# Increment Manual rate by 0.1 Hz
:T-# Decrement Manual rate by 0.1 Hz
:TM# Select custom tracking rate
:TQ# Select default tracking rate
:TDdd.ddd# Set manual tracking rate to ddd.dd (units are not specified)
Table 1. MTSCP Commands Potentially Used for Remote Guiding of LX200 Telescopes
(4 paginas)
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