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Cliff Raccani avatar image

USB to RS485 interface extension cable

Since the usb to rs485 intereface comes in either 1.8m or 5m what is the recommended way of extending this to another 20m? Would a cat 6 cable be suitable for instance?

cablers485
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laurentiu.pitran@gmail.com avatar image
laurentiu.pitran@gmail.com answered ·

hi, personal, i was extended an USB to RS 485 cable, 5 meters long with an 10 meters extender USB cable.

this USB extender cable is an passive one, that you can find generally on IT store magazine.

i don t need more length on cable, so can tell you more.

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Guy Stewart (Victron Community Manager) avatar image
Guy Stewart (Victron Community Manager) answered ·

Yes. There may need to be an additional RS485 terminator for some installations.

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Thanks. Have ordered the interface cable.

I need actually 10m extension. Would I need to terminate at this length?

If so, would a 120 ohm resister at both ends be needed?

Thinking about doing the same as you. Did you need the extra resistors?

I have extended that length without adding resistors and had good reliable performance.

Though as it's an interference issue, every installation will vary.