# Realtime monitoring

#### vaayuputhran

Joined Dec 26, 2007
2
Hello mates,

I am currently doing a project in a plant...They have many PM9c energy meters at various places ...They are manually noting down the readings day by day ...To avoid this am doing a project in such a way that all the energy meters will be interfaced with RS485..I need ur help for interfacing a RS485 with a energy meter..After interfacing all the meters it will get connected to hub and finally to PC..In PC the datas have to be read (REAL TIME MONITORING)through an application..So guys i need a software to read the data that are flowing through the cable wich is conected to PC...Pl help me out....
CHEERS!!!!!!!!

#### mrmeval

Joined Jun 30, 2006
833
All I've found datasheet wise for that meter.
http://dk.schneider-electric.nu/pdf/PM Multimetre/Technical Datasheet/plsed303040en_pm9.pdf
http://download.merlingerin.com/C125721700737133/all/1167ACACE4315B3CC125732B004CE630/$File/ghe12248a.pdf It has RS-485 port and uses Modbus protocol. http://www.modbus.org/docs/PI_MBUS_300.pdf http://www.lammertbies.nl/comm/info/modbus.html Might want something that converts RS485 to RS232 so you can test code on a PC and to make it easier to interface to some microcontrollers. http://www.airborn.com.au/layout/232cnv.html Q: How far apart are the units? Q: Can you get each meter to a network connection? Q: If no network connection is available is there phone, an existing modbus network or are they willing to run cabling just for the meters? Q: What is your budget? Seems to be a good forum for this sort of thing http://www.control.com/ Thread Starter #### vaayuputhran Joined Dec 26, 2007 2 All I've found datasheet wise for that meter. http://dk.schneider-electric.nu/pdf/PM Multimetre/Technical Datasheet/plsed303040en_pm9.pdf http://download.merlingerin.com/C125721700737133/all/1167ACACE4315B3CC125732B004CE630/$File/ghe12248a.pdf

It has RS-485 port and uses Modbus protocol.
http://www.modbus.org/docs/PI_MBUS_300.pdf
http://www.lammertbies.nl/comm/info/modbus.html

Might want something that converts RS485 to RS232 so you can test code on a PC and to make it easier to interface to some microcontrollers.
http://www.airborn.com.au/layout/232cnv.html

Q: How far apart are the units?
Q: Can you get each meter to a network connection?
Q: If no network connection is available is there phone, an existing modbus network or are they willing to run cabling just for the meters?

Seems to be a good forum for this sort of thing
http://www.control.com/

Q:How far apart are the units?
A: The units are not that much apart the max distance is 30m
Q:Can you get each meter to a network connection
A:Yes we gonna do that
Q: If no network connection is available is there phone, an existing modbus network or are they willing to run cabling just for the meters?
A:They are planning to run cable
A: Dont knw abt this...

Can u tell some thing more abt interfacing....

#### mrmeval

Joined Jun 30, 2006
833
99 percent of 'internet' abbreviations are annoying.

Unless you've done work with interfacing systems I can't be of much more help. Read the datasheets and use the free books at www.allaboutcircuits.com

You will want a higher end board that has an ethernet port and at minimun a serial port that runs an OS that you can write software to read those devices.

I think but am not sure you can use the modbus<->rs232 device on the link I posted to use as cheap RS458 interface for the board. I've used one I think is similar and it worked for a different protocol. The protocol is modbus and that would have to be written or found for free or purchased for use on the device you choose.

Then you use an Ethernet port on the device to either send that data to a remote computer or better just allow anyone in the plant to browse a web page on the device. That assumes there's a webserver and code on the system to let you write a web page which takes the gathered data (another program) and displays it. There are literally hundreds of such systems with many being in the 200-500 range.

You can even use a PC if it can be accommodated.

It sounds as if you don't have much experience with these systems. The project you've chosen is pretty big for someone without learning and experience in them. Unless you can throw lots of money at it and pay someone else to do most of the work you'll have to do a lot of study.