(Created page with "The Serial port on your computer uses voltages from -3 to -25V to transmit a logic "1" and a voltage from +3 to +25V to transmit a logic "0" as defined for the RS232 standard....")
 
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=Background=
 
The Serial port on your computer uses voltages from -3 to -25V to transmit a logic "1" and a voltage from +3 to +25V to transmit a logic "0" as defined for the RS232 standard. On most PCs these signals swing from -13 to +13V.
 
The Serial port on your computer uses voltages from -3 to -25V to transmit a logic "1" and a voltage from +3 to +25V to transmit a logic "0" as defined for the RS232 standard. On most PCs these signals swing from -13 to +13V.
  
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So in order to connect a Merlin/Orion/Skywatcher remote head to a computer you need a voltage level converter between the two devices that not only inverts the voltages for digital "1" and "0" but also uses different voltage levels.
 
So in order to connect a Merlin/Orion/Skywatcher remote head to a computer you need a voltage level converter between the two devices that not only inverts the voltages for digital "1" and "0" but also uses different voltage levels.
  
Tronisoft sold these converters but now lists them all as "out of stock":
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=Solutions=
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Unfortunately there is no off-the-shelf solution available so you need to do a bit of manual soldering
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Tronisoft sold these converters for some time but now lists them all as "out of stock":
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http://www.tronisoft.com/cat_rs232tottl.php
 
http://www.tronisoft.com/cat_rs232tottl.php
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and cable creation guide: http://www.autopano.net/wiki-fr/images-fr/5/57/CONNECTING_THE_%C2%AB%C2%A0CABLE-CONNECTOR%C2%A0%C2%BB_TO_THE_TRONISOFT_4207.pdf
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Other untested options are:
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* http://www.amazon.co.uk/TRIXES-USB-Serial-Converter-CP2102/dp/B004ROOPK6/ref=pd_sim_sbs_ce_1
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* http://www.amazon.co.uk/USB-Converter-Module-Built-CP2102/dp/B008RF73CS/ref=pd_sim_sbs_ce_3
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* http://www.amazon.co.uk/USB-Serial-TTL-Cable-FTDI/dp/B00514ZCHQ
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=Bluetooth Interfaces=
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There are several wireless solutions that connect computer and Merlin/Orion/Skywatcher remote head via bluetooth (like: http://www.ursaminor.hu/). These should work fine with Chronomotion as long as the bluetooth connection acts as a virtual serial interface. Chronomotion has not been officially tested with such bluetooth devices yet but we are very interested in reports of someone who tried.

Revision as of 13:03, 28 March 2013

1 Background

The Serial port on your computer uses voltages from -3 to -25V to transmit a logic "1" and a voltage from +3 to +25V to transmit a logic "0" as defined for the RS232 standard. On most PCs these signals swing from -13 to +13V.

The Merlin/Orion/Skywatcher remote head requires different voltages (called TTL levels) that are 0V (digital "0") and 5V (digital "1").

RS232 TTL
digtial "1" -25V to -3V 5V
digital "0" +3V to +25V 0V

So in order to connect a Merlin/Orion/Skywatcher remote head to a computer you need a voltage level converter between the two devices that not only inverts the voltages for digital "1" and "0" but also uses different voltage levels.

2 Solutions

Unfortunately there is no off-the-shelf solution available so you need to do a bit of manual soldering

Tronisoft sold these converters for some time but now lists them all as "out of stock":

http://www.tronisoft.com/cat_rs232tottl.php

and cable creation guide: http://www.autopano.net/wiki-fr/images-fr/5/57/CONNECTING_THE_%C2%AB%C2%A0CABLE-CONNECTOR%C2%A0%C2%BB_TO_THE_TRONISOFT_4207.pdf


Other untested options are:

3 Bluetooth Interfaces

There are several wireless solutions that connect computer and Merlin/Orion/Skywatcher remote head via bluetooth (like: http://www.ursaminor.hu/). These should work fine with Chronomotion as long as the bluetooth connection acts as a virtual serial interface. Chronomotion has not been officially tested with such bluetooth devices yet but we are very interested in reports of someone who tried.