RE: [Modbus] Querying Values from Holding Register

[udeho]

Hi Chris,

yes, I use the 0.6.0 version.
Great, I will try to do it again when the new version is available and let you 
know whether it works.
Thank you very much!

Best
Tim

-----Original Message-----
From: Christofer Dutz <christofer.d...@c-ware.de> 
Sent: Mittwoch, 20. Mai 2020 11:28
To: dev@plc4x.apache.org
Subject: Re: [Modbus] Querying Values from Holding Register

Hi Tim,

I guess you are using one of the "old generation" drivers (As you say it's 
working and the address seems to imply that).
Perhaps you should either try the version 0.8.0-SNAPSHOT or wait for 2 more 
days till we release the 0.7.0 version.

In the 0.7.0 version we have completely deleted all existing drivers and 
replaced them by new ones. 
While at it I took the liberty of making the Modbus a little more robust.

So it would be great if you could give us feedback if your problem goes away 
magically when updating to these driver versions.

Chris



Am 20.05.20, 10:24 schrieb "udeho" <ud...@student.kit.edu>:

    Hi all,

    I have tried to query values from the holding register of a simulated 
modbus device and process them as integer using the following code:
    // read integer / holding register
                        PlcDriverManager driverManager = new PlcDriverManager();
                        String conString = "modbus:tcp://localhost";
                        PlcConnection plcCon = 
driverManager.getConnection(conString);
                        PlcReadRequest.Builder builder = 
plcCon.readRequestBuilder();
                        builder.addItem("value", "readholdingregisters:1");
                        PlcReadRequest readRequest = builder.build();
                        PlcReadResponse resp = readRequest.execute().get();

    This runs well, but when I try to handle the result as integer (using 
resp.getInteger("value")) I always get null as result no matter what's in the 
register.
    For Boolean values in the coil this works without any problem (using 
getBoolean() of course).
    Another approach I tried is using the getAllByteArrays("value"); command, 
but I haven't found a way to get the returned collection of byte arrays into 
integers.

    Can you give me an indication of what my problem may be or what I'm doing 
wrong?

    Thank you very much in advance!

    Best
    Tim