Optimize Flex Getter

Benja · 16 February 2021 19:04

Hi, i need help again

is there a way to leave these 3 function nodes in one?, they are all the same id, different registers.

msg.payload = { value: msg.payload, 
'fc': 3, 
'unitid': 3, 
'address': 6003,
'quantity': 1 } 
return msg;


msg.payload = { value: msg.payload, 
'fc': 3, 
'unitid': 3, 
'address': 200 ,
'quantity': 10 } 
return msg;


msg.payload = { value: msg.payload, 
'fc': 3, 
'unitid': 3, 
'address': 0 ,
'quantity': 53 } 
return msg;

Steve-Mcl · 16 February 2021 19:13

Yes...


node.send({
    payload: {
        'fc': 3,
        'unitid': 3,
        'address': 6003,
        'quantity': 1
    }
});

node.send({
    payload: {
        'fc': 3,
        'unitid': 3,
        'address': 200,
        'quantity': 10
    }
});


node.send({
    payload: {
        'fc': 3,
        'unitid': 3,
        'address': 0,
        'quantity': 53
    }
});

HOWEVER - I have seen issues when requesting too much data in quick succession - you might want to put a rate limiter after the function / before the modbus getter

Benja · 16 February 2021 20:37

var msg1  = (
    {payload:
    {  
'fc': 3, 
'unitid': 3, 
'address': 0,
'quantity': 1 }
});


var msg2  = ({
    payload:
    {  
'fc': 3, 
'unitid': 3, 
'address': 200 ,
'quantity': 10 }
});



var msg3  = ({
    payload:
    {
'fc': 3, 
'unitid': 3, 
'address': 0 ,
'quantity': 53 }
});

return [msg1, msg2, msg3];

I meant something like this,
finally its working
thx

Steve-Mcl · 16 February 2021 20:46

This code I posted earlier (lets call it VERSION 1)...

node.send({
    payload: {
        'fc': 3,
        'unitid': 3,
        'address': 6003,
        'quantity': 1
    }
});

node.send({
    payload: {
        'fc': 3,
        'unitid': 3,
        'address': 200,
        'quantity': 10
    }
});


node.send({
    payload: {
        'fc': 3,
        'unitid': 3,
        'address': 0,
        'quantity': 53
    }
});

is exactly the same as what you are asking for...


var msg1 = {
    payload: {
        'fc': 3,
        'unitid': 3,
        'address': 0,
        'quantity': 53
    }
};

var msg2 = {
    payload: {
        'fc': 3,
        'unitid': 3,
        'address': 200,
        'quantity': 10
    }
};


var msg3 = {
    payload: {
        'fc': 3,
        'unitid': 3,
        'address': 0,
        'quantity': 53
    }
};

return [[msg1,msg2,msg3]]

All 3 messages are sent out one after the other.

If you want a function node with 3 outputs then change the return to return [msg1,msg2,msg3];

BUT since you send the outputs of your functions to the same place - there is literally zero point in sending separate outputs. In fact the first version (VERSION 1) that I first posted will guarantee the order of events.

Benja · 16 February 2021 21:15

thax for the explanation, the problem is that I don't know how to separate the arrays after reading the data, that's why I occupy 3 flex nodes.

Steve-Mcl · 16 February 2021 21:19

Looking at that code, you look like you could benefit from using buffer-parser (it was designed for taking PLC/Modbus data and making sense of it)

e.g. it turns [2,5,12,55,123,6,1,234,6,3] into

{
  "temperature": 12.5,
  "humidity": 47.4,
  "speed": 123
}

fake data

aderici · 17 February 2021 00:12

I will suggest something different. I guess you just want to read the registers on a time based interval. For that purose i used cronplus node. Can define different json to be sent on different intervals. Used it for reading modbus tcp.