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USB to RS485

Posted on 2008-06-24
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Last Modified: 2010-10-26
I am looking for a USB to 485 converter that has a programmbale processor/MCU/PIC between the 485 and the USB so that I can program the DLL portion of a protocol into the converter. This protocol will then only pass/acept Application layer messages from the USB side.
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Question by:Chipkin_com
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10 Comments
 
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Expert Comment

by:f-king
ID: 21884536
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Author Comment

by:Chipkin_com
ID: 21885085
No. These devices do not have a programmable processor between the ports.
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LVL 31

Expert Comment

by:moorhouselondon
ID: 22174537
If RS485 is converted to RS232 then, by virtue of there being COM ports on a regular pc, (and some low-level programming) the pc can be used to act as intermediary between the USB and RS485.
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Author Comment

by:Chipkin_com
ID: 22282806
That solution doesnt work. We want to implement the Data Link portion of the protocol in the device so that it is not sensitive to the timing and variable resouce loading of the computer. The Data link portion of the protocol is responsible for passing the token, token recovery,  wrapping and sending application layer queries, unwrapping and extracting application layer data from response. The device must do all this. The only data that passes from/to the computer is the application layer stuff.
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LVL 31

Expert Comment

by:moorhouselondon
ID: 22284061
In which case:  If BlackBox don't do it - probably it doesn't exist (unless you were prepared to get out your soldering iron):-

http://www.blackbox.com/Catalog/Category.aspx?cid=308,1431,1442
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Accepted Solution

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Chipkin_com earned 0 total points
ID: 22461501
No one has a solution. I have designed and built my own now.
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LVL 31

Expert Comment

by:moorhouselondon
ID: 22462779

>unless you were prepared to get out your soldering iron
 
I see you decided to try out my suggestion ;-))
 
 
'scuse the format of this comment, can't post in regular text box at the mo' for some reason

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