Re: RS485 Communications

"Richard Skinner" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> I have a PC104 SBC that has onboard RS485 ports.  I previously wrote
> standard RS232 comm port routines to talk to devices on the rs485 network
by
> using a 232 > 485 convertor and everything worked great.  Now, however, I
> want to use the onboard 485 ports.  I have two questions....
>
> 1, my port is a 4 wire, my network is a 2 wire.  This is how I converted.
> +TX & +RX Tied together,  -TX & - RX Tied together.    The -TX & -RX hook
to
> A on the Network, and the +TX & + RX hook to B on the network.  Is this
> correct?

No. TX/RX+ is A and TX-/RX- is B

Meindert