Re: SERIAL PORTS (was: cannot connect gto CP3 to the SKy 6)
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USB appears to be simple to the user but is incredibly-complex to the
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developer. RS-232 is simple for developers, especially since it is built-into just about all microcontrollers. When the data-rate is low, RS-232 is the fastest, cheapest and most reliable interface to implement in microcontroller-based devices. All of the USB-to-Serial problems I have ever investigated to date have been related to brand-X adapters, their junky drivers or because the user installed the wrong drivers for his/her particular OS. I hope this helps. Christopher Erickson Consulting Engineer Summit Kinetics Waikoloa, HI 96738 www.summitkinetics.com -----Original Message-----
From: ap-gto@... [mailto:ap-gto@...] On Behalf Of Pete Su Sent: Wednesday, October 17, 2012 12:50 PM To: ap-gto@... Subject: Re: [ap-gto] Re: SERIAL PORTS (was: cannot connect gto CP3 to the SKy 6) I could get behind Ethernet. I find the fascination with RS232 in astronomy circles to be puzzling. While there are certainly reasons that embedded industrial control applications still use them (super simple device interfaces) this is not what we are doing with telescope mounts. Telescope mounts (and cameras, and all the other devices) use the serial line to send commands to the mount controller which are then translated into lower level signal to the motors or whatnot. The only rational reason I can see to prefer RS232 for this above anything else is cable length, but even that's a red herring IMHO. Ethernet cable runs can be just as long and what "everyone" ends up doing anyway is to remote control the mount using a second computer and TCP/IP, which doesn't even need a wire. So yeah, ethernet. It's almost as old as RS-232 anyway (invented in the 70s, vs. the 60s). Pete ------------------------------------ To UNSUBSCRIBE, or for general information on the ap-gto list see http://groups.yahoo.com/group/ap-gtoYahoo! Groups Links ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.2740 / Virus Database: 2614/5832 - Release Date: 10/14/12 |
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