Celestron CPC Deluxe 800 HD Computerized Telescope CPC Deluxe HD Manual - Page 39

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 GoTo Ra-Dec R34AB, 12CE Get Azm-Alt Z 12AB, 4000# Get RA-Dec E 34AB, 12CE# Cancel GoTo M Is GoTo in Progress L # or 1# 10 characters sent. B=Command, 12AB=Azm, comma, 4000=Alt. If command conflicts with slew limits, there will be no action. Scope must be aligned. If command conflicts with slew limits, there will be no action. 10 characters returned, 12AB=Azm, comma, 4000=Alt, # Scope must be aligned 0=No, 1=Yes Commands below available on version 1.6 or later HC version V 1 6 # Stop/Start Tracking Tx x = 0 (Tracking off) 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# 32-bit GoTo Azm-Alt b34AB0500,12CE0500 32-bit get Azm-Alt z 34AB0500,12CE0500# Version 1.6 Alt-Az tracking requires alignment The last two characters will always be zero. 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 3 PC Transmit DB9 Pin 5 Ground DB9 Pin 2 PC Receive >> www.celestron.com 37