Celestron C8-S Manuale Utente
58
Appendix D - RS-232 Connection
You can control your telescope with a computer via the RS-232 port on the computerized hand control and using an
optional RS-232 cable (#93920). Once connected, the telescope can be controlled using popular astronomy software
programs.
optional RS-232 cable (#93920). Once connected, the telescope can be controlled using popular astronomy software
programs.
Communication Protocol:
The Advanced GT communicates at 9600 bits/sec, No parity and a stop bit. All angles are communicated with 16 bit
angle and communicated using ASCII hexadecimal.
angle and communicated using ASCII hexadecimal.
Description
PC Command ASCII
Hand Control Response
Notes
Echo
Kx
X#
Useful to check communication
Goto Azm-Alt
B12AB, 4000
#
10 characters sent. B=Command,
12AB=Azm, comma, 4000=Alt. If
command conflicts with slew limits,
there will be no action.
12AB=Azm, comma, 4000=Alt. If
command conflicts with slew limits,
there will be no action.
Goto Ra-Dec
R34AB, 12CE
#
Scope must be aligned. If
command conflicts with slew limits,
there will be no action.
command conflicts with slew limits,
there will be no action.
Get Azm-Alt
Z
12AB, 4000#
10 characters returned,
12AB=Azm, comma, 4000=Alt, #
12AB=Azm, comma, 4000=Alt, #
Get RA-Dec
E
34AB, 12CE#
Scope must be aligned
Cancel Goto
M
#
Is Goto in Progress
L
0# or 1#
0=No, 1=Yes; "0" is ASCII
character zero
character zero
Is Alignment Complete
J
0# or 1#
0=No, 1=Yes
Commands below
available on version 1.6
or later
available on version 1.6
or later
HC version
V
2
2
Two bytes representing V2.2
Stop/Start Tracking
Tx
x = 0 (Tracking off)
x = 1 (Alt-Az on)
x = 2 (EQ-N)
x = 3 (EQ-S)
x = 0 (Tracking off)
x = 1 (Alt-Az on)
x = 2 (EQ-N)
x = 3 (EQ-S)
#
Alt-Az tracking requires alignment
32-bit goto RA-Dec
r34AB0500,12CE0500
#
32-bit get RA-Dec
e
34AB0500,12CE0500#
The last two characters will always
be zero.
be zero.
Commands below
available on version 2.2
or later
available on version 2.2
or later
32-bit goto Azm-Alt
b34AB0500,12CE0500
#
32-bit get
Azm-Alt
z
34AB0500,12CE0500#
The last two characters will always
be zero.
be zero.
The cable required to interface to the telescope
has an RS-232 male plug at one end and a 4-4
telephone jack at the other end. The wiring is
as follows:
has an RS-232 male plug at one end and a 4-4
telephone jack at the other end. The wiring is
as follows: