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from the Ing department...
Modbus Problem
Communications systems and equipment. topic
Posted by Gonzalo Duran on 2 January, 2009 - 2:09 am
Hello.
my problems is how to convert a serial data (rs232c) in the modbus rtu data

I have a laser sensor that delivers data via RS232C as I can make these data modbus rtu to be read by kepware


Posted by Bob Peterson on 3 January, 2009 - 12:09 pm
Just because it is rs232 does not mean you can access it via modbus
protocol.

There might be some kind of adapter available from the sensor manufacturer for this purpose.


Posted by dinster on 4 January, 2009 - 7:23 am
hi
Bob is right. even though your sensor has RS232C port - it doesn't mean it supports Modbus protocol for data sharing.

pls check your sensor specs.

i personally doubt it has Modbus capability.

if my guess is right. what u can do is connect your laser sensor to a small PLC which supports Modbus protocol eg. Moxa IOlogik series.

may i know the distance between your sensor and your PC containing Kepware's KepserverEx ?

distance plays a role in selecting correct Modbus protocol.


Posted by Fabian Quiñones on 5 January, 2009 - 6:04 am
Hello,

Do you know some converter (company) for this job?? Serial 232 to Modbus RTU??

Thanks.

Regards from Chile.


Posted by Fred Loveless on 5 January, 2009 - 9:01 am
Hi,

What is the make and model of the sensor? If it does not support Modbus it is very likely that Kepware's UCON driver can talk to it.

Contact Kepware Technical Support and ask to be connected to me.

Fred Loveless
Senior Application Engineer
Kepware Technologies
http://www.kepware.com


Posted by pvb on 5 January, 2009 - 1:14 pm
You need an RS232 to RS485 converter like
http://www.232analyzer.com/RS232-RS485-RS422-Serial-Converters /RS232-RS485-Converter.htm

You need software that implements the Modbus protocol. Our project, http://pvbrowser.org provides Modbus in C++.
http://pvbrowser.de/pvbrowser/sf/manual/rllib/html/classrlModb us.html

If you have a C compiler for your hardware you might convert our C++ solution to C.

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