Autor: Radek B (radekb_at_klub.chip.inv.pl)
Data: Thu 07 Feb 2002 - 17:17:13 MET
Bartek G pisze:
>Mam pytanie jak długiego kabla RS można urzywać od urządzenia do komputera?
>Bo chce podłączyć moduł z SDI do komputera serwera. problem w tym, że SDI
>jest u sąsiad piętro niżej i chce wiedzieć czy gdy pociągne kabel do niego
>to będzie to w pełni wartościowe. Może są jakieś wzmacniacze sygnału?
>
The RS-232C spec. has an official limit of 50 ft for RS-232C cables.
Realistically they can be much longer. The book "Managing UUCP and
Usenet" by O'Reilly and Associates has a table that they credit to
"Technical Aspects of Data Communications", by McNamara (Digital
Press, 1992). It lists the maximum distances for an RS-232C
connection.
Baud Rate | max distance | max distance
| shielded cable | unshielded cable
----------------------------------------------------------
110 | 5000ft | 3000ft
300 | 5000ft | 3000ft
1200 | 3000ft | 3000ft
2400 | 1000ft | 500ft
4800 | 1000ft | 250ft
9600 | 250ft | 250ft
Please note that "baud" is correct in this case, because we're speaking
of
the transmission line itself.
This is what Torbjoern (sp?) Lindgren told me:
I have successfully transmitted at 115,200 with over 30m long cables!
And it wasn't especially good wires. I had some old telecables with 20
individual wires, and used 7 of them for transfer, and left the others
unconnected.
I don't remember the exact length, but I know it was something over
30m, and it probably was closer to 40m than 30m. The unused lines
probably shielded the lines from each other or something like that.
The computers used were two PC-compatibles with off-the-shelf
com-ports. Nothing fancy.
-- mailto:radekb_at_klub.chip.inv.pl ! Odpowiadając na priv usuń 'inv.' z adresu !
To archiwum zostało wygenerowane przez hypermail 2.1.7 : Wed 19 May 2004 - 00:14:03 MET DST