Communication interface device

A communication control method using a communication interface device for a processor, the method comprising:

• a sampling step of sampling a receive signal received via a communication line;
• a data transfer rate acquiring step of acquiring a data transfer rate;
• a bit determination step of making a bit determination regarding the receive signal at the acquired data transfer rate, to thereby acquire serial data contained in the receive signal;
• a transmitting step of sending, via a communication line at the acquired data transfer rate, a transmit signal containing serial data sent by the processor;
• a processor communication step of receiving the serial data sent by the processor, and of outputting to the processor the serial data acquired at the bit determination step;
• and
• an adjustment step of, when the transmit signal is sent multiple times at different data transfer rates at the transmitting step, adjusting the data transfer rate based on the receive status of respective response signals thereto.

A non-transitory computer-readable recording medium recording a program to cause a computer that operates as a communication interface device for a processor to function as:

• a sampler that samples a receive signal received via a communication line;
• a data transfer rate acquirer that acquires a data transfer rate;
• a bit determiner that makes a bit determination regarding the receive signal at the acquired data transfer rate acquired by the data transfer rate acquirer, to thereby acquire serial data contained in the receive signal;
• a transmitter that sends, via a communication line at the acquired data transfer rate acquired by the data transfer rate acquirer, a transmit signal containing serial data sent by the processor;
• a processor communicator that outputs to the transmitter the serial data sent by the processor, and outputs to the processor the serial data acquired by the bit determiner;
• and
• an adjuster that, when the transmitter sends the transmit signal multiple times at different data transfer rates, adjusts the data transfer rate based on the receive status of respective response signals thereto.