RS-485 (serial )support on Mini2440 ?

Hi,
   I want to know if there is a support for Rs-485 serial communication and
how to configure it as say software selectable.

Thanks in Advance,

Please Acknowledge,
Thanks & Regards,
SRIKANTH.K

Hi,

I'm not quite sure but if I remember good all UART's are in TTL standard - 
3,3 V I guess - and only one is in RS-232 standard.

RS-485 is just UART in different voltage levels. If you want You can make
extra PCB board with a RS-485 transceiver and connect it to your mini2440
UART.

hi Chester,
           Thanks for the reply yes RS485 is just  UART in different
voltage levels , I wanted to make sure before purchasing this board bcoz
some boards support software selectable to switch between Rs232 / Rs485
half duplx) but however while using in applications there are some changes
need to be done for using the RS485 as it is having control lines and half
duplex so was curious to know ?

thanks & regards,
srikanth.k

I have made this usb <> rs485 for my mini2440;
http://evertdekker.com/Joomla/index.php?option=com_content&task=view...
The Ftdi FT232 takes care of the rx/tx switching, so programming or io pin
is not needed.

RS485 is half duplex (receiver OR emitter at a given time) and need an 
extra signal to set transceiver receiver or emitter.
Sometimes this signal is base on whether there is something to send or not
(by some kind of "re-triggable monostable")

regards,

hi Edje11,
          is the ftdi module( driver) available in mini2440 board's
preloaded linux ? or did u patch it externally.

Thanks in Advance,

srikanth.k

hi david,
         do u have a C program example for using the rs485 in application
or just a small functions for read and write applications via rs485

Thanks in Advance,
srikanth.k.

Hi Srikanth,

Ftdi drivers are available for win-ce 5.0 and 6.0, you can find them at
http://www.ftdichip.com/Drivers/VCP.htm