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I'm using the ModbusMaster.h library on a project, with arduino-uno and a TTL/RS-485 converter, and the function has to identify the slave that it is communicating. The slaves goes from 1 to 16. After I've begun the connection,

ModbusMaster node(1);
node.begin(9600);

I have to send a message, and if this massage returns an error, I have to change the slave number, until I got an valid answer. But I didn't find any functions to close this connection, or to delete it, I even have tried,

delete &node;

but it didn't work. I'm trying to close this connection so I could begin another one with another node, because I didn't find a function to change the slave number.

Claudiaum
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1 Answers1

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Maybe this question is too old and the API has changed, so my answer is reference.

The ModbusMaster constructor does not accept parameters.

From reading the source code, the method begin(uint8_t slave, Stream &serial) just initializes variables and can be called again with a new slave value without the need to destroy the ModbusMaster object.

Reference:

[1] https://github.com/4-20ma/ModbusMaster/blob/master/src/ModbusMaster.cpp, line 61.

Marcelo Roberto Jimenez
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