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Forum Index : Electronics : How long a serial cable can be ...
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vasi Guru  Joined: 23/03/2007 Location: RomaniaPosts: 1697 |
Hi all! ... for programming a PICAXE or any PIC without problems? Thank you! Cheers, Vasi Hobbit name: Togo Toadfoot of Frogmorton Elvish name: Mablung Miriel Beyound Arduino Lang |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5017 |
I use a 3 wire cable that is about 10 meters long, works without any problems. I once had a 3 wire serial cable that was 50 meters long for transfering files between two computers, from memory it was running at 19,200 bd. Telephone cables are just two twisted wires and they can handle modulated 4800bd for several kilometers. Good thing about serial communications is you can reduce the data rate to get a reliable signal, even down to 75bd as used by the old Telix machines. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| vasi Guru Joined: 23/03/2007 Location: RomaniaPosts: 1697 |
Thank you Glenn! So, long enough to put it between the keyboard and display. Working on computer but with programmer under my eyes. Vasi Hobbit name: Togo Toadfoot of Frogmorton Elvish name: Mablung Miriel Beyound Arduino Lang |
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| RossW Guru Joined: 25/02/2006 Location: AustraliaPosts: 495 |
Were not most of the telix machines 45.45 baud? (50 baud in 60Hz countries) Also, IIRC, they were never RS232, they were current loop. RS232 does have substantial distance limitations, but for most of us they are not an issue at "sensible" speeds. There are serial variants (like RS423) that use differential signals to overcome many of the noise and distance problems of RS232, and can run signals 1500m or more at reasonable speeds without problems. |
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Art_ Newbie  Joined: 22/10/2007 Location: AustraliaPosts: 30 |
All of the above might be true, until you try to program a pic microcontroller with a serial programmer which is not ordinary serial communication :D The JDM (or clone) programmers use 12 Volt from the signal to trigger the pic's programmng pin, also timing is important. The shorter the cable the better me thinks, my serial programmer was shaky at best (only worked half the time). If not actually, then potentially. |
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