How can i test RS-485

Dsoky over 1 year ago

Hello, i am looking for a way to test MAX-485 , i do not have any idea how to do it , anyone can help me?

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beacon_dave over 1 year ago in reply to Dsoky +2

Perhaps Jan Axelson's book 'Serial Port Complete' might help you ? http://janaxelson.com/spc.htm It covers the basics of serial communications, covers working with RS485 networks, and includes some…
KennyMillar over 1 year ago in reply to Dsoky +2

Yeah no problem, here it is: https://www.analog.com/media/jp/technical-documentation/data-sheets/1111.pdf If you have any questions please feel free to ask - I use these chips in loads of things. …
Dsoky over 1 year ago in reply to KennyMillar +2

Ok good stuff i found that module https://handsontec.com/index.php/product/ft232r-usb-to-serialttl-converter-module/ will that work ?

Jan Cumps over 1 year ago

Do you want to test the RS-485 serial protocol? I could not find a MAX-485 device.
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javagoza over 1 year ago

You will need two devices to test it. RS-485 is half duplex, the same two wires are used for transmission and reception, and cannot be looped back.
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Dsoky over 1 year ago in reply to Jan Cumps

it is an IC not a device sir.
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Dsoky over 1 year ago in reply to javagoza

I understand that, but how to test them, what do i need to test them?
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Jan Cumps over 1 year ago in reply to Dsoky

looking again for MAX-485 IC ...
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Jan Cumps over 1 year ago in reply to Dsoky

Do I understand it right that you want to test the RS-485 protocol on a MAX485 tranceiver?

I have some experience with other receivers from TI. What is the microcontroller you are using to talk to the MAX485?
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Dsoky over 1 year ago in reply to Jan Cumps

Yes that is right, i was thinking about using a software on pc like SSCOM but i only knew about it today and to get USB TO RS485 Converter, and connect the pins of this adapter to the (A and B) of the IC, Then i connect the output pins of the IC to another USB TO RS485 Converter which is connected to a different USB port or even different pc , I do not know if this is stupid or not it is just what i thought about and no idea if it works. but i am looking for any way to test this IC.
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Jan Cumps over 1 year ago in reply to Dsoky

It looks like you are doing something that's right. Connect two serial logic devises to each other via two RS-485 drivers. In my experience, that has always worked, if the logic devices have the same settings, and the drivers are connected correctly. RS-485 is a standard and the devises that claim to support it, usually do.

What is going wrong in your case?
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Jan Cumps over 1 year ago in reply to Dsoky

If you want to test an RS-485 device, the only thing you need is another RS-485 device. One that can show what it receives, and can send data back.

If that doesn't work, you will have to dig into the electronica, and use a protocol analiser, or oscilloscope, to see what's happening on the wires.
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Dsoky over 1 year ago in reply to Jan Cumps

Well the thing is i am not sure if it will work or not so i was asking before i buy the converters cuz it is not easy to get them here so if i will get them it must be worth is, And i still do not know what to do with the other pins of the IC. still looking for answers.
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