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 Posted: Mar 15, 2012 - 09:43 PM |
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Joined: Jun 15, 2009
Posts: 134
Location: Northern California
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I need an adapter that will let me interface an RS-485 or RS-422 line to a PC via USB. I'd like something that isolates the RS-485 line as it's coming from a outdoor sensor and I'd like to keep any induced surges on the line out of the PC.
Can anyone recommend a good one? I've seen many advertised, but I know that some are complete rubbish, so am looking for opinions on which ones to consider.
Thanks. |
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Posted: Mar 15, 2012 - 09:53 PM |
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Joined: Dec 30, 2004
Posts: 8748
Location: Melbourne,Australia
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| Advantech ADAM4561. Uses a prolific pl2303. Opto isolation wont give much lightning protection or surge protection. |
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Posted: Mar 15, 2012 - 10:16 PM |
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Joined: Feb 19, 2010
Posts: 507
Location: Montreal, QC, CA
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| An USB AVR with ADuM series galvanic isolators from Analog? |
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Posted: Mar 16, 2012 - 12:16 AM |
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Joined: Jun 08, 2011
Posts: 301
Location: Maryland, USA
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| Maxim has several all in one RS485 transceivers with up to 2500Vrms isolation, like the MAX1480. They're much more expensive non-isolated transceivers, but only require a couple of external resistors-- optos & transformers are built in. Combine with your choice of USB-TTL serial adapters--just be sure you pick one that breaks out the proper flow control lines if you're doing half-duplex. |
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Posted: Mar 16, 2012 - 04:21 AM |
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Joined: Mar 28, 2001
Posts: 20339
Location: Sydney, Australia (Gum trees, Koalas and Kangaroos, No Edelweiss)
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I'm using LTC1545 in a current project. Used it before in another project and so far had no problems.
The transformer used is a Wurth 31160.
Of course that's only half of the solution in your case. |
_________________
John Samperi
Ampertronics Pty. Ltd.
www.ampertronics.com.au
* Electronic Design * Custom Products * Contract Assembly
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Posted: Mar 17, 2012 - 04:01 PM |
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Joined: Mar 17, 2012
Posts: 3
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Kartman wrote:
Advantech ADAM4561. Uses a prolific pl2303. Opto isolation wont give much lightning protection or surge protection.
considering the same one, have you tried it personally? |
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Posted: Mar 17, 2012 - 10:40 PM |
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Joined: Dec 30, 2004
Posts: 8748
Location: Melbourne,Australia
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| Used quite a few over the years. |
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