Function 01 (01hex) Read Coils br Reads the ONOFF status of discrete coils in the slave. br Request br The request message specifies the starting coil and quantity of coils to be read. br Example of a request to read 10...22 (Coil 11 to 23) from slave device address 4: br br Response br The coil status response message is packed as one coil per bit of the data field. Status is indicated as: 1 is the value ON, and 0 is the value OFF. The LSB of the first data byte contains the coil addressed in the request. The other coils follow toward the high-order end of this byte and from low order to high order in subsequent bytes. If the returned coil quantity is not a multiple of eight, the remaining bits in the final data byte will be padded with zeroes (toward the high-order end of the byte). The byte count field specifies the quantity of complete bytes of data.