| CPC H04L 12/403 (2013.01) | 20 Claims |

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12. A communication control method comprising:
transmitting a main frame including main data to one slave or a plurality of slaves connected to a communication device in a first period;
setting a second period and one time slot or a plurality of time slots, the second period being shorter than the first period, the one time slot or the plurality of time slots being allocated to the one slave or the plurality of slaves, respectively, in every second period; and
communicating each of the one slave or the plurality of slaves in a corresponding one of the one time slot or the plurality of time slots, so that the communication part communicates with all the or the plurality of slaves in every second periods, a total time period of the one time slot or the plurality of time slots in every second period being shorter than the second time period.
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