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Adding a RS232 interface to the Mintron camera

Concept of the RS232 interface

The basic concept of the RS232 control interface is to mimic the buttons remotely.

Besides this there are 3 additional general purpose control outputs P1.0 to P1.2 available.

Remote connector for the RS232 interface

I replaced the connector on the rear of the Mintron, which is normally used as an S-Video

output, by a 6 pin Mini.-DIN connector and use it also for the remote control operation. The

S-Video output is not really necessary at a black/white camera because the same signal is

available at the BNC connector. However I still use one of the pins as a video output because

this allows me to connect all signals, including the power supply of the Mintron, with this

single connector. This allows a quick and easy setup and is especially nice when using it with

the Hyperstar lens assembly in front of the telescope (see also section “The Mintron used with

a NexStar N11GPS and a Hyperstar lens assembly (at f/2.1)”).

1 = GND

2 = Composite Video Output

3 = TXD (RS232 input, +/- 12V levels)

4 = Switch output P1.0 (e.g. video switch)

5 = GND

6 = 12V DC input/output

Schematic of the RS232 interface module

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Celestron 44200 Instruções de Operação Página 11