Yan
Thanks for the quick responce. The question I was asking was intent
on getting some information on a com port that has the ability to run
rs485 vs a com port that can just run rs232. I have a TS-7200 with
rs485 capable port. I have it setup to run rs232. I am running
rs232 on the other end. I have hardware and software flow control
disabled on both ends. Yet it seems to stop sending/receving. But
what I was asking is for the diffrences in hardware on the ts-7200
for just rs232 vs (rs232 and rs485) on a com port. I get the same
software to run fine on COM1 vs COM2(get's stuck).
--- In "Yan Seiner" <> wrote:
>
> --- In "Art" <kingartjr@> wrote:
> >
> > Is there any diffrences in a rs485 configured port that would
prevent
> > it from functioning as a standard rs232 port? I then ask what
are the
> > diffrences? it seems event when I turn the flow control off on
this
> > port it still functions as if it were in place. Getty doesn't
seem to
> > work well on com2.
> >
> rs232c and rs485 specify different electrical standards. I am not
> sure what you are asking.
>
> Typically rs485 is run on 2 or 4 wires, with no flow control lines.
> I'm not that familiar with the 4 wire setup; I've only used
> half-duplex (2 wire). Each station turns its transmitter on when it
> wants to say something; the other stations are supposed to respect
> that and not transmit.
>
> RS232c is point-to-point, and provides for all sorts of redundancy
> (the full spec has secondary RX and TX lines, even...) There are
> liens that each station is supposed to turn on and off when it is
> ready. There are also signal lines for special events like carrier
> detect.
>
> Basically, RS232c was designed to talk short distances to a modem,
an
> RS485 was designed to talk long distances to multiple peers. Also,
> an RS485 bus is (I believe) a voltage differential setup, whereas
> RS232 is referenced to 0, but I could be getting confused with
another
> bus I am working with...
>
> So when you switch a port from rs232 to rs485, you lose all hardware
> flow control, since there is none.
>
> --Yan
>
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/ts-7000/
<*> To unsubscribe from this group, send an email to:
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
|