Disabling logs

[IlhanSeven]

Hi,

Is there a way to disable logging. Log files go crazy.

Thanks.

[dresende]

Try adding option debug : null. I should change it to also undefined..

[IlhanSeven]

Thank you. Sorry I must be blind.

[IlhanSeven]

Sorry, where should I add it when using modbus serial?

[dresende]

Like in the README, where you see "automaton-123", use null instead.

[IlhanSeven]

Hey man,

Is there an example for writeSingleRegister or writeMultipleRegister or both? Sorry I could not find it in your docs.

[dresende]

Check Requests Section.

connection.writeSingleRegister({ address: 123, value: Buffer.from([ 0x12, 0x34 ]) }, (err, info) => {
    console.log("response", info.response);
});

[IlhanSeven]

I was actually using below code for that being a tcp server.

connection.on("write-single-register", (req, reply) => {
      registerMap[req.request.address] = req.request.value;
      reply(???)
});

Using Modbus Poll I can write a value but I get timeout error in response. What should be in place of question marks in the reply?

[dresende]

On a reply, try this:

// error = null, value = buffer
reply(null, Buffer.from([ 0x12, 0x34 ]));

[dresende]

You can also trigger standard errors like:

reply("IllegalDataAddress");

[dresende]

https://github.com/node-modbus/pdu#exceptions

[IlhanSeven]

I tried error = null and echoing back the value written but still getting Timeout Error on Modbus Poll. On the slave side, I am getting:

server error TypeError: Cannot read property 'copy' of undefined
    at Object.exports.buildRequest (C:\Users\Ilhan\Desktop\NodeDocker\mixergy-modbus-slave\node_modules\modbus-pdu\lib\protocol\WRIT
    at Object.build (C:\Users\Ilhan\Desktop\NodeDocker\mixergy-modbus-slave\node_modules\modbus-pdu\lib\Modbus.js:113:30)
    at C:\Users\Ilhan\Desktop\NodeDocker\mixergy-modbus-slave\node_modules\modbus-stream\lib\transport\transport.js:165:75
    at Stream.connection.on (C:\Users\Ilhan\Desktop\NodeDocker\mixergy-modbus-slave\modbus-tcp-server.js:34:21)
    at emitTwo (events.js:106:13)
    at Stream.emit (events.js:191:7)
    at Transport.<anonymous> (C:\Users\Ilhan\Desktop\NodeDocker\mixergy-modbus-slave\node_modules\modbus-stream\lib\stream.js:44:10)
    at emitThree (events.js:116:13)
    at Transport.emit (events.js:194:7)
    at handle (C:\Users\Ilhan\Desktop\NodeDocker\mixergy-modbus-slave\node_modules\modbus-stream\lib\transport\transport.js:156:16)

Thanks for help man.

[dresende]

Can you show your code. That error is an indication that it's trying to return a buffer and you didn't supply it. It didn't see an error.

[IlhanSeven]

Here it is:

module.exports = {
    initModbus: function() {

        modbus.tcp.server({ debug: null }, (connection) => {
            connection.on("error", (err) => {
                console.log("server error", err);
            });

            connection.on("read-holding-registers", (req, reply) => {

                if(req.request.address >= 2000 && req.request.address <= 2299 && (req.request.address + req. request.quantity) <= 2299) {

                    var startIndex = req.request.address - 2000;
                    var endIndex = startIndex + req.request.quantity;
                    var response = new Array();
                    for(var i = startIndex; i < endIndex; i++) {
                        response.push(mixergyMap[i]);
                    }
                    reply(null, response);
                } else {

                    reply("IllegalDataAddress");
                }
            });

            connection.on("write-single-register", (req, reply) => {

                if(req.request.address >= 2000 && req.request.address <= 2299) {

                    mixergyMap[req.request.address - 2000] = req.request.value;
                    reply(null, mixergyMap[req.request.address-2000]);
                } else {
                    reply("IllegalDataAddress");
                }
            });

        }).listen(5502, () => {
            console.log("server ready");
        });
    }
}

[IlhanSeven]

I think the issue is the reply function. I am not sure if I am using it correctly. According to Modbus standard, we should echo back the request when the function is 'write' (Correct me if I am wrong). I could not figure out how to do this.

[dresende]

My bad, I forgot something. You are correct, you should echo back the request value and the address. You should reply like this:

reply(null, req.request.address, req.request.value);