ME to RS485 hardware connection

Embedded Devices NET+OS
1

I’m wanting to move from the development board to a prototype. I want to build a small board with power, Connect ME, presumably a RS-485 transceiver, to RS-485 +/-. Does anyone have a schematic for the most basic Connect ME to RS-485 interface?

Thanks very much for any help.

2

The CC 9P 9125 development board includes a RS232/422/485 design.

http://ftp1.digi.com/support/documentation/90000885_A.pdf
However, with respect to the Digi Connect ME on the software side, please also take a look at the RS485 related posts in this forum.

3

Thanks Miker–

I think maybe I wasn’t clear with my question. I have developed the application and have it working on the Connect ME on the Dev Board. I now want to move the Connect ME to a minimal interface which will have only the Connect ME I/O and RS-485 I/O. I need help with how to make the connections between the Connect ME serial interface and RS-485 +/-. Do I need a RS-485 transceiver? If so, how is it connected to the Connect ME?

Thanks

4

Understood. The CC 9P 9215 RS485 implementation should help, though. The concept is the same.

5

Thanks again, Mike.

I’m sure you’re right. It SHOULD help. But for a guy who is challenged to do the software end, and who knows very little about the hardware end, it will be a major accomplishment if I can just get an interface board assembled, let alone designed, by myself. This is for a very specific use and I just need the RS-485 connection. It appears that because there are the other flavors of serial I/O on the dev board, there is a lot more circuitry there than I need. All that other circuitry is what’s hard for me to figure out and understand what is the minimal circuitry I need to make just the RS-485 connection.

Doug

6

I think this is what you’re looking for