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Trying to read gps Lat and Lng off of modbus which I believe should be on address 2800 and 2802 but the values appear wrong in Node-Red but correct on the Remote Console.
Correct Lng on Remote Console:-
Modbus node settings
Output in Node-Red
Can anyone help or explain what is wrong or I'm doing wrong?
Thanks for any help.
The answer is given as an _int32_ contained in the 2 array values. This means that you need to convert it back to something more readable. This can be done, for example, with a function node that does something like:
msg.payload = msg.payload[0] << 16 | msg.payload[1];
if ((msg.payload & 0x8000) > 0) {
msg.payload -= 0x10000;
}
msg.payload /= 10000000;
return msg;
The first part concatenates the two array values to a single number. Then the first bit is checked to see if the number is negative or not. Finally the result is divided by 10000000.
flows.json.zip
I have tried to use your example with a solar controller but failed again. The result should be 0.21999r confirmed in VictronConnect. If you explain were I've gone wrong I would appreciate it.
Thanks for your time.
com.victronenergy.solarcharger Yield yesterday 786 uint16 10 0 to 6553.5
Object id 786 is an int16, which means that you need to set the quantity to 1 instead of 2. So you can ignore the 101 in your example and focus on the 2. The scale factor is 10 for id 786, so that makes 2/10 = 0.2. I assume that the modbus reading looses some of the accuracy.
In order to easily retrieve modbus values for our equipment, you might want to take a look at the subflow I just added here: https://flows.nodered.org/flow/c54f2b4e3cb525d3232018c6144cbd12, which only requires to add the UnitID and the correct line from the attributes.csv file (more info is in the documentation of the flow). Feel free to test and provide feedback so that subflow can be further improved.
Using link https://flows.nodered.org/flow/c54f2b4e3cb525d3232018c6144cbd12 I am suitably impressed. Thanks for some great work.
