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RS-485 / EtherGate: Daisy Chain Practical Cable Distance

Scott_MCN
Lieutenant
Lieutenant
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3
104

RS-485 / EtherGate: Daisy Chain Practical Cable Distance

Greetings All,

I am looking for the practical cable distance limit of an RS-485 Daisy Chain through EtherGate.

My current understanding is that the device limit is roughly a third of the standard 32 devices (6-10), however I could not find any practical documentation on Cable Distance in real-world applications, and am sure that it will be less than 4000m - the standard for RS-485.

Regards, Scott.

3 Replies 3
Benji
Administrator Administrator
Administrator

Re: RS-485 / EtherGate: Daisy Chain Practical Cable Distance

For your convenience, in the future please place your question in the corresponding sub community as more people will see it there. This question had been placed in "Community Help", and only people following this sub Community will get notified. You find the sub communities in the top left part. Click "Communities" and then select the area your question is about.

I've moved this question for you.

abhishek_lanjul
Lieutenant JG
Lieutenant JG
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36

Re: RS-485 / EtherGate: Daisy Chain Practical Cable Distance

Hi Scott,

According to my knowledge the device limit is 32 device on paper but for practically it is recommended to use

Up to 25-30 device on single daisy chain loop without any repeater to avoid disturbance and fluctuation of data.

And if we are talking about cable distance in real time application it is 4000 feet i.e.,around 1200 m.

Regards,

Abbyshek

Bojan
Captain Captain
Captain

Re: RS-485 / EtherGate: Daisy Chain Practical Cable Distance

The maximum length of the daisy chain is dependent on the baud rate of the devices.

See table below.

Typical maximum RS-485 Drive Distance

Baud Rate150-9600192003840057600115200
Distance (feet)40003200300023001600
Distance (meters)1220975914701488

*Note: Based on 24 AWG twisted shielded pair, 0.026 Ohm/ft (0.085 Ohm/m), 13pF/ft(41pF/m) conductor to conductor, 22 Pf/ft (72pF/m) conductor to shield.