Sending signals with rs485

[mamech]

Hello

I want to make an application in which I connect 2 distant micros using rs485. I intend to use max485 .I know that the output of micro is TTL. Will connecting micro directly to max485
will produce a 485 ? or should I convert the TTL to rs232 using max232, then connect its output to max485?

 

[IanP]

MAX485 can be connected directly to a microcontroller (TTL or CMOS) ..

:wink:

 

[IanP]

see attached picture ..

 

[hussain_kiet]

be aware that max485 is half duplex..
If you want full duplex you have to connect two separate Max485 for TX and RX...

 

[mamech]

Can you please reattach a clearer photo? This one is not clear

 

[IanP]

Try:
Microcontrollers in Practice - M. Mitescu, I. Susnea (Springer, 2005) WW.pdf - 4shared.com - partage de documents - télécharger

Page.163 ...+++

IanP
:wink:

 

[ajitnayak]

Hi,

I wanna simple circuit which can convert TTL to RS485 as well as RS232, can you share me the circuit for design which takes TTL as input and gives out rs232/rs485 as output. I am planning to use max232 and max 485 IC. I don't know how connection are made. TTL input are coming from GPS Sensors.
i required connection in full duplex form

see attached picture ..