rs485 phrase

aaronik19 · Joined: 25 Apr 2011 Posts: 297

Hi All,

I came across this code:

dyeatman · Joined: 06 Sep 2003 Posts: 1941 Location: Norman, OK

The function is defined to return a char, so the return statement is returning
the character stored in the array location msg[2].
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aaronik19 · Joined: 25 Apr 2011 Posts: 297

thanks for the reply. In RS485, If I want to send the following statement like c=23 (similar to RS232), how I can achieve it with RS485?

if I am using rs485.c driver, do I need to include #int RDA or it is being take care in the rs485.c driver? lots of thanks to all

temtronic · Posted: Fri Dec 30, 2011 1:58 pm

You have to understand that RS-485 and RS-232 are just variations of serial communications . The main difference is RS-232 is normally 'peer to peer', ie: 2 devices, usually full duplex, each can talk while the other listens.
RS-485 is usually a 'networked' system, half duplex. there's a 'master'(talker) and several 'slaves'(listeners). Control for whose in charge is done by the 'enable' control pins of the transceiver chip ( MAX488 or eq.)

HOW you send data is up to you....typical setup is same as 'RS232' being 8 bits,1 stop bit,no parity, baudrate of 9600 but there are no rules except being compatible with the hardware in the systems.