11 May
2006
11 May
'06
12:26 a.m.
Ethan Dicks schrieb:
With the talk of 20mA converters, it reminds me to
ask... is there a
simple schematic for a basic RS-232 to fiber media converter? In the
[...]
Anyone have any ideas on how to construct such a
beast? I can build
pretty much anything from a schematic or even a napkin, but I'm not
really a designer. If it's as simple as hooking an LED to the TTL
output of a MAX232, and the phototransistor to the input of a MAX232,
that'd be super, but I suspect that there might need to be a little
more to it than that.
It *is* as simple as that (you don't use an LED and a phototransistor,
but rather pairs of
existing opto tranceivers, like the HFBR-04xx/14xx series from Agilent)
- provided you just need
TXD/RXD and software handshake. If you want full-blown hardware
handshake with all modem lines
you either result in a bundle of 5-10 fibres, or you
multiplex/demultiplex these signals with a small microcontroller on
every side.
Holger