Celestron CGEM - 1100 Computerized Telescope CGEM Series Manual - Page 60

Appendix C - 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. Communication Protocol: The CGEM Mount 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 Goto Azm-Alt Goto Ra-Dec Get Azm-Alt Get RA-Dec Cancel Goto Is Goto in Progress Is Alignment Complete Commands below available on version 1.6 or later HC version Stop/Start Tracking 32-bit goto RA-Dec 32-bit get RA-Dec Commands below available on version 2.2 or later 32-bit goto Azm-Alt 32-bit get Azm-Alt Kx B12AB, 4000 R34AB, 12CE Z E M L J X# # # 12AB, 4000# 34AB, 12CE# # 0# or 1# 0# or 1# Useful to check communication 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; "0" is ASCII character zero 0=No, 1=Yes V Tx x = 0 (Tracking off) x = 1 (Alt-Az on) x = 2 (EQ-N) x = 3 (EQ-S) r34AB0500,12CE0500 e 22 # # 34AB0500,12CE0500# Two bytes representing V2.2 Alt-Az tracking requires alignment The last two characters will always be zero. b34AB0500,12CE0500 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: 60