Celestron NexStar 5i Manuel d'instructions télécharger pdf (Page 50)

DB9 Pin 5

Ground

DB9 Pin 3

PC Transmit

DB9 Pin 2

Receive

4-4 Modular

Phone Jac

To make a RS-232 connection with the NexStar , the hand control must be in RS-232 mode – which can be accessed

through the Menu button. Once in the RS-232 mode, the hand control still has the following abilities

• Direction buttons – Allowing you to move the telescope in both directions

• Rate changes – Allows you to change the telescope's rate of speed when using the direction buttons.

• Und – Use to escape from RS-232 mode.

Protocol:

NexStar5 communicates at 9600 bits/sec, No parity and stop bit.. All angles are communicated with 16 bit numbers

Before all commands, the following INITIALIZATION is necessary

• PC sends one byte (63=Ascii “?”) to check that NexStar is ready.

• NexStar responds with one byte (35) when NexStar is ready to respond. After NexStar sends a 35, the

buttons to the hand control do not respond until the command from the PC has been received, then the

direction, rate, and undo buttons are active.

Goto RA-Dec positions

• INITIALIZATION

• PC sends (82=Ascii “R”)

• PC sends the RA high byte, RA low byte, Dec high byte, Dec low byte.

• When the scope is finished slewing, it will send back a “@”.

Goto Alt-Az positions

• INITIALIZATION

• PC sends (65=Ascii “A”)

• PC sends the Azm high byte, Azm low byte, Alt high byte, Alt low byte.

• When the scope is finished slewing, it will send back a “@”.

Get RA-Dec positions:

• INITIALIZATION

• PC sends (69=Ascii “E”)

• NexStar sends the RA high byte, RA low byte, Dec high byte, Dec low byte.

Get Alt-Az positions:

• INITIALIZATION

• PC sends (90=Ascii “Z”)

• NexStar sends the Azm high byte, Azm low byte, Alt high byte, Alt low byte.

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Celestron NexStar 5i Manuel d'instructions Page 50