Starlight Xpress SXV-AOLF - Manual (Page 12)

Handbook for the Starlight Xpress AOL unit Issue 1 21/5/2010
This information is provided for users who wish to write their own control programs.
The serial mode command list
Char
1
Char
2
Char
3
Char
4
Char
5
Char
6
Char
7
Result Return
K Find Centre K
G N 0 0 0 0 1 AO 1 step North G or L
(hit limit)
G S 0 0 0 0 1 AO 1 step South G or L
(hit limit)
G T 0 0 0 0 1 AO 1 step East G or L
(hit limit)
G W 0 0 0 0 1 AO 1 step West G or L
(hit limit)
M N 0 0 0 0 1 Mount 1 step N M
M S 0 0 0 0 1 Mount 1 step S M
M T 0 0 0 0 1 Mount 1 step E M
M W 0 0 0 0 1 Mount 1 step W M
R Centre at low
speed (unjam)
K
L Get Limit switch
status
Character
with an ASCII
value between
0x30 and
0x3F
V Code version
number
V + 3 digits
X Handshake Y
U Update firmware U = Success,
Z = Fail
Parallel mode - the pulse width input specification
In pulse width mode, the input is a pulse width encoded signal with four direction lines
and a common ground, similar to that used for telescope mount control. However, the
pulse width per motor step is greatly reduced, so as to minimise the response time. The
minimum control pulse width is 10mS, which steps by 1 step in the appropriate direction.
Longer pulses follow in a linear progression, increasing by 1 motor step for each 10mS
incremental increase in pulse length. Note that only ONE input can be low at any one
time, otherwise other control functions may be inadvertently initiated.