Configuration of µC/Modbus is done at compile time via about 20 #define constants. Configuration values are found in mb_cfg.h which should be placed in your product’s directory or, you can copy the #define constants in a header file of your choice. It’s recommended that you copy the mb_cfg.h file that is provided with the µC/Modbus distribution, and modify its content instead of creating mb_cfg.h from scratch. This way you have a better chance of not forgetting any #define constants. Default values are shown in RED.
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Configuring µC/Modbus, MODBUS_CFG_SLAVE_EN
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