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Fix modbus function 23 to conform with v1.1b3.#189

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Fix modbus function 23 to conform with v1.1b3.#189
ext-frha wants to merge 1 commit intoljean:masterfrom
ext-frha:master

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According to the Modbus Application Protocol V1.1b3, function code 23 (read write multiple registers) should first perform the write operation before the read operation. Additionally, the maximum quantity to write should be 121.

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