RS485 half duplex and full duplex questions

regards:

by the way could I ask a question,could I simply use the "RTS line" to
control
RS485 half duplex mode?

and I ask a question.
and  when I am using RS485 FULL duplex (RS422 mode),Do I need any
control
lines like "RTS","CTS"?


any positive suggestion is welcome.
best regards to you all

mike

On 2007-12-15, mikeotp@gmail.com <mikeotp@gmail.com> wrote:

> by the way could I ask a question,could I simply use the "RTS
> line" to control RS485 half duplex mode?

You can if your RTS line is wired up to the direction control
on your transceiver.

> and I ask a question. and when I am using RS485 FULL duplex
> (RS422 mode),Do I need any control lines like "RTS","CTS"?

That depends on how your driver and receiver are wired to your
serial port.

> any positive suggestion is welcome.

Learn to use Google and Wikipedia?

http://en.wikipedia.org/wiki/RS-485

-- 
Grant Edwards                   grante             Yow!  Is it NOUVELLE
                                  at               CUISINE when 3 olives are
                               visi.com            struggling with a scallop
                                                   in a plate of SAUCE MORNAY?

regards:


   If my system is like the followings:
   the system architecture is:
   http://0rz.tw/d83qm

   then do I need any control signal to control the "TX" "RX"?

   any positive suggestion is welcome.
   best regards to you all

   mike

mikeotp@gmail.com wrote:
> 
> regards:
> 
> 
>    If my system is like the followings:
>    the system architecture is:
>    http://0rz.tw/d83qm
> 
>    then do I need any control signal to control the "TX" "RX"?
> 
>    any positive suggestion is welcome.
>    best regards to you all
> 
>    mike
No, you do not need to contrl the TX/RX signal.

However, you can only talk to one device.
You will lose all multi-drop capability.

donald