Java Modbus Library Activity
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Activity for Java Modbus Library
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Auvray posted a comment on discussion Help
Hello, I would like to know if the Modbus Java API provided by Jamod supports all the function code and especially the function code 01 Thank you for support Grégory
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Marlon Trujillo posted a comment on ticket #51
Duplicate of: https://sourceforge.net/p/jamod/bugs/53/
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This should be handled by "Debug" static field....: public interface Modbus { /** * JVM flag for debug mode. Can be set passing the system property * net.wimpi.modbus.debug=false|true (-D flag to the jvm). */ public static final boolean debug = "true".equals(System.getProperty("net.wimpi.modbus.debug")); ... }
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Prashant Chavan posted a comment on discussion Help
Hi, I need to create multiple slaves which are going to communicate with a modbus master app. Now I have defined multiple process images for each slave but when I couple the image with Modbus Coupler it is considering only one slave (Latest one). Do we have any provision where I can couple multiple process images?
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lucas daniel isa toyos posted a comment on discussion Help
Good morning, get the modbus master tcp to work. This gives me the values in hexadecimal, I did some tests and it works perfectly. The last two pairs of 00 show me the data reading, at first I think it is the information of the slave, the type of data to read, in this case holding register. What I can not do is get the data I read in a floating number import java.io.*; import java.lang.*; import java.net.InetAddress; import net.wimpi.modbus.Modbus; import net.wimpi.modbus.io.ModbusTCPTransaction;...
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Giuseppe posted a comment on discussion Open Discussion
I solved, the problem was that the modbus data simulator (http://www.plcsimulator.org/) was set with number of server connection 10, changing this parameter with 1000 the app works fine.
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John D Charlton posted a comment on discussion Open Discussion
I don't have an example, but it should work to open the connection first and close it at the end when finished. In the loop do read and display the output. If your goal is to have 1 sec output you should set a timer event for 1sec to update the output. Here is an example of a timer thread but you can do your own google search to find other examples: https://stackoverflow.com/questions/9413656/how-to-use-timer-class-to-call-a-method-do-something-reset-timer-repeat?newreg=0d9fcf1d977f487f8c72bc2ee...
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Hi John, do you have an exampe with refresh update of 1 second?
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You can try to reduce your sleep time so that the read operation is able to work more frequently. As long as you have some sleep time in the loop it will prevent it from spinning and using up all of the processor time. Also you probably want to open the TCP socket in a separate method and leave it open for the duration rather than reconnecting every second. That is probably where all the extra time is going. John
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Thread threadInit = new Thread(new Runnable() { public void run() { Message msg = null; enExecution = true; Integer i = 0; while (enExecution) { try { i++; readDataMb(); Thread.sleep(1000); //mmsec Refresh data } catch (InterruptedException e) { Log.d("[Android]Main", e.getMessage()); } } } }); threadInit.start(); private void readDataMb() { String astr = "192.168.3.88"; //Modbus Device InetAddress addr = null; try { addr = InetAddress.getByName(astr); } catch (UnknownHostException e) { e.printStackTrace();...
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Christopher Piggott posted a comment on discussion Help
Here is what I used. You call ModbusCOnvUtil.wrap(response) around the response. I only filled in a couple of conversions, and the byte ordering is for a Modicon M340. As has been pointed out here there isn't really a "standard" but this byte ordering works most places I have needed it. Hope it works fo ryou. import net.wimpi.modbus.msg.ModbusResponse; import java.io.ByteArrayOutputStream; import java.io.DataOutputStream; import java.io.IOException; import java.nio.ByteBuffer; /** * Helper for converting...
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Tony Stock posted a comment on discussion Open Discussion
Hi, I'm looking into some existing code that reads from a Modbus device using jamod...
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Aleksandrs posted a comment on discussion Help
When sending TCP request with unsupported function code slave closest connection...
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When sending TCP request with unsupported function code slave closest connection...
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Lalitha Darshana posted a comment on discussion Help
Hello, There are two devices(a display and a rfid reader) communicate with modbus...
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Vaishnavi modified a comment on discussion Help
Hi All, Here is my code: private float getData (String address, int count) { float...
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Hi All, Here is my code: private float getData (String address, int count) { float...
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Hi, I'm using jamod library and trying to convert data read from Input Registers...
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Hi, I'm using jamod library and trying to convert data read from Input Registers...
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SUNIL KUMAR SAINI created ticket #21
byte array reading reaponse error 0x80
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Hi, I am reading specific IP port by jamod Library i am reading everything well but...
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Ramas posted a comment on ticket #20
Error in connecting unit using modbus protocol
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Error in connecting unit using Modbus protocol
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Bram Bouwens posted a comment on discussion Open Discussion
Maintaining several programs across multiple platforms, I always use purejavacomm...
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AurélienC modified a comment on discussion Help
Hello everyone, I want to use this library for create a listener server. I have tried...
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Hello everyone, I want to use this library for create a listener server. I have tried...
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Julie Haugh posted a comment on discussion Help
There's no standard way of reading or writing floating point values. You'd have to...
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Joe Roberts posted a comment on discussion Help
Regarding reading the data, can you not do it by using the ReadInputRegistersRequest...
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Hi, I am new to jamod - first day...:) Also, I am pretty green when it comes to Modbus....
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Benni R posted a comment on discussion Help
Hello, I am using jamod inside an osgi framework. The system is running on an raspberry...
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Greg Cushing modified a comment on discussion Help
Hi, I am trying to write a float value to a 984-265 quantum using the jamod library....
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Hi, I am trying to write a float value to a 984-265 quantum using the jamod library....
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Janek - TCP is a stream protocol, unlike UDP which uses datagrams. What this means,...
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You make the requests "headless". This causes the 6 byte Modbus/TCP header to be...
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You need to enable Modbus/TCP transaction validation to prevent this. This will cause...
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This can't be done with jamod because the SimpleProcessImage class adds registers...
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The proper approach to handling floating point numbers is to convert the value into...
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Your Modbus/TCP slave needs to allow reads via wither FC 3 or FC 4 to use the same...
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Boveri Asea posted a comment on discussion Help
Greetings, I am currently working with the Java Modbus TCP Slave which can be found...
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Suman posted a comment on discussion Help
i am developing a android app and i want to read the coil status on click of a button.i...
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TEH3OP posted a comment on discussion Help
This error sometime appears on Android platform. I add: int countBytes = m_Input.available();...
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Hi. I had a following situation. I sent a request ReadMultipleRegistersRequest, receive...
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José Manuel Pires posted a comment on discussion Help
Hello, I'm trying to implement a ModbusTCP Master with RTU compatibility. I have...
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David Brodrick posted a comment on discussion Open Discussion
Hi Dieter, We had problems with jamod not properly reporting a broken socket vs a...
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Mario Ivankovits created ticket #19
ModbusTCPTransaction hides IO Exceptions on retry
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allow to configure a connect timeout on TCPMasterConnection
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Janek Nikolajev posted a comment on discussion Open Discussion
Hello, We are having an issue with the way how MODBUS request fields are written...
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Jonathan Fischer posted a comment on ticket #6
Whoops, I meant to post this as a Bug, not a Patch. I'm not terribly familiar with...
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Register address bug in WriteMultipleRegistersRequest.readData()
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Mikhail posted a comment on discussion Help
Hello Helmi Now I want to connect 750-881 and Android-device ( odroid xu Hardkernel)...
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FIRAT KÜÇÜK created ticket #53
Explicitly printed exceptions
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H. de Ruiter posted a comment on discussion Help
JaMod works great for me as I'm using it to read from / write data to (dedicated)...
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Balasubramaniam posted a comment on discussion Open Discussion
Hi, i am new to java serial port programming, I have trying to read data from the...
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Peppe posted a comment on discussion Help
Hi! I create a software using the Jamod API for monitoring PLC using a Driver written...
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Hi! I create a software using the Jamod API for monitoring PLC using a Driver written...
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Generally speaking, you use function code 3. Input registers and holding registers...
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don't you think there is a better solution for this? add a fixed delay for small...
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don't you there is a better solution for this? add a fixed delay for small or large...
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Ken LE PRADO posted a comment on discussion Help
Maybe a too late answer... Float is not part of the original Modbus protocol. It...
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ascaso66 created ticket #18
Analog Output Holding Registers vs Analog Input Registers Reading Issue
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Hi all, I'm a beginner on ModBus I/F, please excuse me. Using jamod I wrote a Slave...
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The Modbus protocol does not support a PDU size greater than 253 bytes. Unless these...
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ModbusUDPTransport writes too much data
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Moritz posted a comment on discussion Help
Hi, I have to work with an device, that has to send a lot of states to a Java application...
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Fatima posted a comment on discussion Open Discussion
SAME HAPPENED WITH ME AND I AM ALSO LOOKING FOR SOME HELP IF YOU GET ONE PLEASE DO...
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SAME HAPPENED WITH ME AND I AM ALSO LOOKING FOR SOME HELP IF YOU GET ONE PLEASE DO...
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I am trying to read the input registers of my PLC through MODBUS TCP using this program...
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Helmi posted a comment on discussion Open Discussion
The error come from the ReadCoilsRequest(2001, 1); 2001 is out of bound
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The java code is well running. I´m writing coils in numeric output (0-1024) plc 750-881,...
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The java code is well running. I´m writing coils in numeric output (0-1024) sps 750-881,...
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Welcome to Modbus. This is perhaps the first, and most confusing, thing about Modbus....
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SOPC posted a comment on discussion Help
Hi, I am new to modbus, while testing serial master i am getting below error. OS:...
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michelion1 posted a comment on discussion Help
Hello I want to talk to an device, which has a diffrent PDU adressing. The addressing...
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It sounds like either you have a JAR that doesn't include the referenced class, or...
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I'm fairly confident this bug is not present in j2mod. The issue is that Modbus/TCP...
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I've verified that this problem does not exist in j2mod.
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Greets, I've not had a chance to go through all of j2mod and make the change that...
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Efecan created ticket #17
Serial Modbus Slave for Android on Beaglebone Black
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Daniel Sohl created ticket #51
Exception handling prints stack trace to stdout
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abramidgeo posted a comment on discussion Help
Hello, After testing Jamod with mod_RSsim Simulation Software, I tried a power analyzer(SENTRON...
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Hello, After testing Jamod with mod_RSsim Simulation Software, I tried a power analyzer(SENTRON...
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Bjoern posted a comment on discussion Help
Hm, the offset was incorrect in writeCoil(). For pulse output the offset is different...
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Hi I'm using Jamod for controlling outputs on a Moxa E1214-T. I'm able to change...
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Robert created ticket #5
Refine interface to throw detailed exception
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valarauca posted a comment on discussion Help
Thank you for your help.
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Dieter Wimberger posted a comment on discussion Help
Master: The unit identifier can be set on the ModbusRequest (that extends ModbusMessageImpl):...
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I'm attempting to set the unitID for a tcp modbus transaction I can't seem to find...
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