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Related to 49d6f4a71f686de64e5c28d6dd8acd2c98c5038d.
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modbus_set_slave must be used to set the slave ID of the remote device to talk in master mode and to set the internal slave ID in slave mode. If you talk to several devices, you need to call modbus_set_slave each time the following requests must be sent to another device.
