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1. 

   victoroza
   Member

   Dear all,

   I have a question that I can't seem to find answer for. Is it possible to use USB-to-RS-485 adapter and then the same adapter to a PC to basically extend the connection range to a Maple.

   Any suggestions would be appreciated.

   Posted 2 years ago #
2. 

   victoroza
   Member

   So what I meant is connect Maple to USB-to-RS485 adapter, then use another adapter of the same kind to connect Maple to a PC.

   Posted 2 years ago #
3. 

   ala42
   Member

   No, as the maple board can not act as USB host.
   RS485 is usually used in half duplex mode on a 2-wire bus having several devices connected. If you really want that you can connect a RS485 driver to a maple USART.
   If you just need a point to point connection a RS422 connection is probably better.
   Main question is what data rate and line distance do you have, which protocol and duplex mode has to be used ?

   Posted 2 years ago #
4. 

   victoroza
   Member

   Thank you ala42 for your response. In my case the data rate doesn't play a big role. What I have is the RS-485 over Ethernet converter at the remote test site. What I want is to be able to connect to Maple over RS-485, somehow, to be able to see it on my PC. The distance between the Maple and RS-485 over Ethernet is about 10 m. I also have RS-232 port available at my disposal on that converter. Any suggestions?

   Posted 2 years ago #
5. 

   ala42
   Member

   For just 10m you usually use RS232. Search ebay for MAX3232 to find some cheap converter modules.
   If it should be RS485 you can use one or two MAX485, which also cost about nothing on ebay. With just one you can only use half duplex communication.
   If you write the software for the maple and the PC yourself, you could also use a cheap ENC28J60 ethernet module, but this requires more software effort that using the standard USART functions and using a virtual comport on the PC.
   For firmware updates you still need a USB connection or have to use a custom bootloader.
   So there are lots of options.

   Posted 2 years ago #
6. 

   gbulmer
   Moderator

   victoroza - would you please explain what you are trying to achieve and what your constraints are?

   It is often easier for people to help if they understand what it is you need to do, but harder for them to help when they are reacting to pieces of a possible solution.

   (Full disclosure: I am not a member of LeafLabs staff.)

   Posted 2 years ago #
7. 

   victoroza
   Member

   Hi gbulmer,

   Basically we have an outdoor test site that is about 200 m away from my work station. The test site has Maple Mini doing some useful DAQ. I would like to have the data stream to my PC. At the test site we have Ethernet access.

   Posted 2 years ago #

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