Modbus Serial Master Jamod Download
Hi, I have a problem with my serial modbus setup (small Arduino based nodes using SimpleModbusSlaveNG). The symptoms are similar to what was described in this thread: but I’m running openhab 1.7.1.
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Enhanced Modbus library implemented in the Java programming language - steveohara/j2mod. Modbus modbus-tcp modbus-rtu modbus-slave modbus-serial modbus-master 179 commits 2 branches. Clone or download.
With one slave, even with default 200ms polling I see no errors in the log. Hi, a couple of points there: a) Turn verbosity of the logger up, by adding that to logback.xml (further information: https: ) b) There are currently a couple of troubles with the modbus serial module [2], including that it is unable to handle more than one modbus:serial.*.id [1] and a receive problem with (at least) the raspicomm module [3] see: So, try your connection with a single modbus:serial.*.id and I’m sorry to tell you, that there is nobody working on the Problems [1] and [3] right now. Best [1] [2] [3] (new users can only put two links in a post, wtf) github.com/openhab/openhab/issues/2843. Hi, Thanks for the hints. I gave up trying to fix openhab’s internal support for modbus/rtu. I found another solution which works around some/most of the problems I described. I added an additional service between openhab and the serial adapters used for modbus communication.
I used which works as a modbus/tcp modbus/rtu gateway. Then I changed the configuration of openhab to use modbus/tcp which seems to work way better than the serial version. Additional bonus is that now I can connect to the slaves from outside of openhab with some standalone modbus clients without disabling the modbus parts in openhab. This setup is not perfect but fixes some of the problems and opens some additional possibilites so for now I’ll keep it running like this. Regards Jacek.
• I’m not sure I understand your setup. From your defines it seems that your master is an arduino not openhab. Correct me if I’m wrong. • AFAIK the polling interval in openhab doesn’t mean delay between each poll operation but interval for each slave so even with 5 slaves if I have poll = 1000, each slave will be polled every 1s, not every 5s. I think this is where the original problem comes from: even with poll = 10000, all slaves are polled around the same time and then nothing is happening for 10s.
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• again, using mbusd as a “proxy” between serial bus and openhab seems to handle the queuing of requests properly so you might want to give it a try. This is a bit off-topic, but following up on the suggested workaround. That is, using a Modbus/TCP Modbus/RTU gateway. I’m planning on using a hardware gateway box, and really just want to confirm that the OH Modbus binding will try to work with multiple serial RTU slaves on one TCP gateway. So far as I can see, that just requires the binding to honour the “unit ID” address in the TCP package (which is normally redundant for a true TCP slave) From the description of the software gateway workaround, it seems like it should work? This may be a “nobody knows”, in which case I will try to add my own results at some later date. The serial support in the binding really needs to be worked on.
You cannot send a couple of commands at a time and then somehow hope that some clients respond after a while. You can do so in Modbus TCP to a certain extent but that doesn’t work at all in Modbus serial! Being a Modbus serial master works like this: • Look at your queue, get the next client id, function code and data • Wait 1,7ms (if you are doing 19200 baud or more) • send the command • start to listen, wait for data until timeout (modbus specs call for 1.x seconds here - which is a bit too much for most clients but some of them are really slow), start again at 2 or stop doing anything and throw an error if there is no response • if data starts to flow, receive and determine the end of the message by measuring the time between the received bytes. A gap of 1,7ms marks the end of the message.
Of course, if you are the only Master on the bus, which is the only setup officially supported by plain Modbus, the gap will be indefinite. • determine whether the CRC is correct • parse the message, • Look at your queue and get the next client id, function code and data, go back to 2 However accurately measuring time in the range of one or two milliseconds is impossible to do in Java, I suppose. Fortunately, we don’t really need to do that. [quote=“skazi, post:10, topic:3430, full:false”] IIRC the only difference between TCP and RTU versions of Modbus is the CRC.[/quote] That is not the only difference. In fact Modbus TCP embeds Modbus RTU into IP packets but without CRC. The important difference is somewhere else: There is no collision management in Modbus RTU at all and therefore no packet stack in Modbus serial clients.