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.

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.

Description

PC Command ASCII

Hand Control Response

Notes

Echo

Kx

X#

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

0# or 1#

 

 

 

Is Alignment Complete

J

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

Commands below available on version 1.6 or later

HC version

V

22

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#

 

 

 

Two bytes representing V2.2 Alt-Az tracking requires alignment

The last two characters will always be zero.

Commands below 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.

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:

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Celestron C80ED-R, C100ED-R manual Appendix D RS-232 Connection

C100ED-R, C80ED-R specifications

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