Ethernet to RS-485

imloggedin · Jun 24, 2008

Can anyone recommend a good Ethernet to RS-485 converter for modbus traffic? Im using a Lantronix unit right now and im not very happy with it.

Kev77 · Jun 24, 2008

Try Datalink Technologies, I think that have a converter.

imloggedin · Jun 24, 2008

I only see Ethernet to DH+ and DH-485 from them.

rleonard · Jun 24, 2008

We have used Moxa converters as well as Lantronix in the past. What issues are you having with the Lantronix devices?

Kev77 · Jun 24, 2008

Check this link, I think this is what you are looking for;

http://www.protocolconverter.com/products/dl4500MEDH485.htm

Mickey · Jun 24, 2008

Heres a couple more.

http://www.bb-elec.com/product_family.asp?familyid=275

http://www.blackbox.com/Catalog/Detail.aspx?cid=308,1422,1552&mid=5363

tragically1969 · Jun 24, 2008

We use hundreds of these, no problems with them

http://www.powerlogic.com/products.cfm?id=17

diat150 · Jun 24, 2008

digi

phoenix contact

what problems are you having with the lantronics? we have hundreds of them with no issue.

Rick-RTA · Jun 24, 2008

You could try our product:

http://www.rtaautomation.com/ethernetip/dnm2eip/

The web page says preliminary but it hasn't been updated for a while. It is one of our many off the shelf products.

Rick DeMorrow

Rick-RTA · Jun 24, 2008

Sorry, that link was for EtherNet/IP to Devicenet.
Here is the link for our EtherNet/IP to Modbus RTU gateway:

http://www.rtaautomation.com/ethernetip/mbm2eip/

Rick DeMorrow

imloggedin · Jun 24, 2008

sweet, thanks for all the links

diat150 · Jun 24, 2008

imloggedin said:
sweet, thanks for all the links

not to be edgy, but I would like to know what kind of problem you are having. maybe someone can help you and save you some money, or we could learn something to avoid in the future. you are kind of leaving us hanging here. lantronix is pretty widely used. we literally have hundreds, if not a thousand of them.

DeviceMaster-UP · Jun 25, 2008

DeviceMaster RTS

C O M T R O L makes a product called DeviceMaster RTS which offers Serial to Ethernet connectivity. We have a variety of port density options from 1 to 32 serial ports and offer RS-232/422/485 software selectable on a per port basis.

Peter Nachtwey · Jun 25, 2008

We have used the Lantronics units. They work OK but aren't optimal

A protocol aware unit is best and will be faster. A protocol aware when it has a complete packet so it can relay the packet through the other port. If you were writing the code don't you think you would wait for the end of a Modbus packet before sending in on as a Modbus/TCP packet? What defines the end of a Modbus packet? When the going the other way will the Ethernet to serial converter know about the Modbus packet's timing requirements?

I didn't see where the protocol was mention or even asked for. Doesn't anybody think it will make a difference?

zova · Jun 25, 2008

imloggedin said:
... modbus traffic ...

As far as I know in the described case two technologies are possible:

1 - a remote serial port

2 - a converting of protocols ModbusRTU <> ModbusTCP

Years ago I had evaluated both of them. I found out that variant #2 is much more stable.

The experiments were done with I-7188E3 unit which supports both of the technologies.

What technology #1 or #2 did you mean exactly?

Ethernet to RS-485

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