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how to use RS485 bus to interconnect more than 32 points

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ilker

ilker

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rs485 more than 32

i have a problem in my project about rs485 bus (two direction) ,
i used Ti's SN75176 rs485 line driver to interconnect devices in my recent projects. it supports up to 32 points. but now, i need to communucate more than 32 points. Do you have any suggestion? maybe another ic or tip.

thanks
 

Maxim has plenty of chips that will support up to 256 points - check this out:
**broken link removed**
 

    ilker

    ilker

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Use ADM2483 for isolated interface. Or MAX487 for non-isolated. There are a lot of different chips, for this purpose
 

Companies develop bus extension boards . You can try to use 2 uart micro equipped with rs485 drivers which pass bytes from one uart to another and vice versa . To second uart you can connect another 31 devices .

Using Maxim chips will obligate their exclusive use on bus in future once the number of devices is more than mentioned 32.
 

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