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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
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Direction buttons – Allowing you to move the telescope in both directions
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Rate changes – Allows you to change the telescope's rate of speed when using the direction buttons.
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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
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Before all commands, the following INITIALIZATION is necessary
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PC sends one byte (63=Ascii "?") to check that NexStar is ready.
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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
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INITIALIZATION
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PC sends (82=Ascii "R")
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PC sends the RA high byte, RA low byte, Dec high byte, Dec low byte.
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When the scope is finished slewing, it will send back a "@".
Goto Alt-Az positions
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INITIALIZATION
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PC sends (65=Ascii "A")
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PC sends the Azm high byte, Azm low byte, Alt high byte, Alt low byte.
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When the scope is finished slewing, it will send back a "@".
Get RA-Dec positions:
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INITIALIZATION
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PC sends (69=Ascii "E")
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NexStar sends the RA high byte, RA low byte, Dec high byte, Dec low byte.
Get Alt-Az positions:
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INITIALIZATION
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PC sends (90=Ascii "Z")
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NexStar sends the Azm high byte, Azm low byte, Alt high byte, Alt low byte.
DB9 Pin 2
PC Receive
DB9 Pin 5
Ground
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DB9 Pin 3
PC Transmit
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