Anyone familiar with this uC

Thread Starter

R!f@@

Joined Apr 2, 2009
9,918
Hello Guys.
I like to know if any one knows abt this chip in details.
This chip is used to convert 2 input pulses to RS485 Modbus. PCB has a MAX487

My issue is figure out the Address, parity, stop and Data type. I am trying to connect this to an HMI.
Any help will be highly appreciated.

Regards
 

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nsaspook

Joined Aug 27, 2009
13,418
I know. Bloody thing does not seem to work.
Ho wan I check this via PC?
Use an o-scope or one of those $10 USB logic analyzer to look at the bus for proper signals sent and received. Be sure the power pins are connected correctly and measure the A B wires for bus proper termination with the system unpowered.
 

Thread Starter

R!f@@

Joined Apr 2, 2009
9,918
I used a USB to RS485....
No UART terminal software was able to get the data from the register.
I can connect. I believe this things needs specific address to read the data register
Try to find a software that can talk to this.
 

Thread Starter

R!f@@

Joined Apr 2, 2009
9,918
Well..Guess what?
The address was wrong.
Had to contact manufacturer and they sent the correct address and software to test it.
Go figure.
 
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