Rs-485

jmspaggi

Hi,

Do we have a way to read RS-485 communications with a Javelin?

I have a device which is emiting data that I want to retreive on my Javelin and store on an USB Key. 24/7.

Thanks,

JM

Chris Savage

JM,

What protocol does the device use? RS-485 doesn’t imply anything other than the signal type/level. How the data is communicated (protocol) could vary from device to device. Assuming it uses standard serial protocol then you could interface to it with a MAX-485 type driver and receive the data. If it is a network device using TCP/IP, UDP or some other network protocol then you’re going to have a more difficult time.

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Chris Savage
Parallax Engineering

jmspaggi

Hi Chris,

Thanks for your reply.

The device I'm trying to attach documentation is attached to this post. I think that it's a "simple" serial communication because they say that we can connect it directly to the PC COM port and read the data. Do you know where I can find a schema for the MAX-485?

Thanks,

JM

Chris Savage

JM,

The following link provides some standard RS-485/422 interface ICs that may work in your application. I hope this helps. Take care.

http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1111

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Chris Savage
Parallax Engineering

Peter Verkaik

JM,

Here is a class that extends the Uart class for half duplex RS485.
Notice the parameter parity. If you don't need parity remove
the parameter. Best to create a new class in that case.
The class goes into folder ...\lib\stamp\core

regards peter

jmspaggi

Will be very usefull! Thanks a lot!

I will buy a MAX-485 or MAX-487 this week-end to start testing.

Regards,

JM