Celestron CPC Deluxe 1100 HD Computerized Telescope - Manual (Page 39)

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APPENDIX C - RS-232 CONNECTION (FOR COMPUTERIZED HAND CONTROL)
You can control your NexStar 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 NexStar can be controlled using
popular astronomy software programs . Communication Protocol
CPC communicates at 9600 bits/sec. No parity and a stop bit. All angles
are communicated with 16 bit 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.
GoTo Ra-Dec R34AB, 12CE Scope must be aligned.
If command conflicts with
slew limits, there will be
no action.
Get Azm-Alt Z 12AB, 4000# 10 characters returned,
12AB=Azm, comma,
4000=Alt, #
Get RA-Dec E 34AB, 12CE# Scope must be aligned
Cancel GoTo M
Is GoTo in Progress L # or 1# 0=No, 1=Yes
Commands below available on version 1.6 or later
HC version V 1 6 # Version 1.6
Stop/Start Tracking Tx Alt-Az tracking
x = 0 (Tracking off) requires alignment
x = 1 (Alt-Az on)
x = 2 (EQ-N)
x = 3 (EQ-S)
32-bit GoTo RA-Dec r34AB0500,12CE0500
32-bit get RA-Dec e 34AB0500,12CE0500# The last two characters
will always be zero.
32-bit GoTo Azm-Alt b34AB0500,12CE0500
32-bit get Azm-Alt z 34AB0500,12CE0500# The last two characters
will always 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: 4-4 Modular
Phone Jack
DB9 Pin 2
PC Receive
DB9 Pin 3
PC Transmit
DB9 Pin 5
Ground