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Sending signals with rs485

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mamech

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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?
 

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IanP

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

:wink:
 

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IanP

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see attached picture ..
 

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  • microcontroller-to-Rs485.png
    microcontroller-to-Rs485.png
    77.1 KB · Views: 58

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hussain_kiet

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

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mamech

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

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IanP

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Try:
**broken link removed**

Page.163 ...+++

IanP
:wink:
 

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  • RS485 and Microcontroller[1].png
    RS485 and Microcontroller[1].png
    66.7 KB · Views: 45

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ajitnayak

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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




IanP said:
see attached picture ..
Click to expand...
 

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