A sample analyzer, comprising: a measuring unit for measuring a sample, wherein the measuring unit comprises a first communication part which is configured so as to be capable of external communication, a register connected to the first communication part, a first actuator for dispensing the sample, a second actuator for measuring the sample, a detector for detecting cells in the sample to generate an electrical signal as a measurement data, a first drive circuit connected to the register and the first actuator; a second drive circuit connected to the register and the second actuator and a third drive circuit connected to the register and the detector; and a data processing unit for processing data output from the measuring unit, wherein the data processing unit comprises a processor for generating control data, and a second communication part which is configured so as to be capable of communicating with the first communication part for transmitting the control data generated by the processor to the first communication part, characterized in that the control data generated by the processor is stored in the register; each of the first actuator, the second actuator and the detector is configured so as to be driven according to control signals output by each of the first drive circuit, the second drive circuit and the third drive circuit, respectively, according to the control data stored in the register, the first communication part is configured so as to transmit the measurement data to the second communication part, the second communication part is configured so as to receive the measurement data transmitted from the first communication part, and the processor processes the measurement data received from the second communication part to generate a sample analysis result, wherein the processor generates the control data at predetermined time intervals, wherein the first communication part and second communication part are respectively configured so as to transmit and receive the control data by interrupt transfer. a measuring unit for measuring a sample, wherein the measuring unit comprises a first communication part which is configured so as to be capable of external communication, a register connected to the first communication part, a first actuator for dispensing the sample, a second actuator for measuring the sample, a detector for detecting cells in the sample to generate an electrical signal as a measurement data, a first drive circuit connected to the register and the first actuator; a second drive circuit connected to the register and the second actuator and a third drive circuit connected to the register and the detector; and a data processing unit for processing data output from the measuring unit, wherein the data processing unit comprises a processor for generating control data, and a second communication part which is configured so as to be capable of communicating with the first communication part for transmitting the control data generated by the processor to the first communication part, characterized in that the control data generated by the processor is stored in the register; each of the first actuator, the second actuator and the detector is configured so as to be driven according to control signals output by each of the first drive circuit, the second drive circuit and the third drive circuit, respectively, according to the control data stored in the register, the first communication part is configured so as to transmit the measurement data to the second communication part, the second communication part is configured so as to receive the measurement data transmitted from the first communication part, and the processor processes the measurement data received from the second communication part to generate a sample analysis result, wherein the processor generates the control data at predetermined time intervals, a data processing unit for processing data output from the measuring unit, wherein the data processing unit comprises a processor for generating control data, and a second communication part which is configured so as to be capable of communicating with the first communication part for transmitting the control data generated by the processor to the first communication part, characterized in that the control data generated by the processor is stored in the register; each of the first actuator, the second actuator and the detector is configured so as to be driven according to control signals output by each of the first drive circuit, the second drive circuit and the third drive circuit, respectively, according to the control data stored in the register, the first communication part is configured so as to transmit the measurement data to the second communication part, the second communication part is configured so as to receive the measurement data transmitted from the first communication part, and the processor processes the measurement data received from the second communication part to generate a sample analysis result, wherein the processor generates the control data at predetermined time intervals, wherein the first communication part and second communication part are respectively configured so as to transmit and receive the control data by interrupt transfer.