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Using 75179B (RS485) application circuit for multipoint communication

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fabouus

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hi...friends..i have a problem with RS485 multipoint full duplex communication.. i use IC 75179 but i don't have right circuit that to be implemented... so i use 75176 appication circuit.. but the problem occur. i can't access both of the slave in the same time. anyone please help me to solve this problem.. if you have a right circuit for 75179 application in multipoint access and how to troubleshoot, please discuss with me...
thanks...
 

fabouus said:
hi...friends..i have a problem with RS485 multipoint full duplex communication.. i use IC 75179 but i don't have right circuit that to be implemented... so i use 75176 appication circuit.. but the problem occur. i can't access both of the slave in the same time. anyone please help me to solve this problem.. if you have a right circuit for 75179 application in multipoint access and how to troubleshoot, please discuss with me...
thanks...
Click to expand...

When you have master and slave's, the master addresses each slave and the slave responds. The master can send comman commands to both the slaves.

In 75176, there is a direction control. You will have to use the direction control line appropriately.

Cheers

Ravi
 

thanks.. it means that i have to control both of Tx and Rx pin?? cause i have used request protocol but only one slave can comunicate with master....

---------- Post added at 09:18 ---------- Previous post was at 08:57 ----------
ravimarcus said:
When you have master and slave's, the master addresses each slave and the slave responds. The master can send comman commands to both the slaves.

In 75176, there is a direction control. You will have to use the direction control line appropriately.

Cheers

Ravi
Click to expand...


thanks.. it means that i have to control both of Tx and Rx pin?? cause i have used request protocol but only one slave can comunicate with master....
 

You have to control the direction of the transmission.

If RE and DE are tied together and then brought low, you will be able to receive data and to transmit, take the line high.

Cheers

Ravi
 

ravimarcus said:
You have to control the direction of the transmission.

If RE and DE are tied together and then brought low, you will be able to receive data and to transmit, take the line high.

Cheers

Ravi
Click to expand...

i use 75179 as full duplex communication, i can't access slave with request sent program, do you have any idea??
 

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