| 摘要 |
PROBLEM TO BE SOLVED: To prevent collision owing to simultaneous calls and to improve communication efficiency by making a call at every period being a frequency selected at random among plural call frequencies and selecting the call frequency among the call frequencies at every period longer than the period at the time of waiting for reception. SOLUTION: A master machine 1 having a printer function, a facsimile function and a master/slave telephone function, sound terminal machines 3a-3c and radio adapters 4a-4c as slave machines for non-sound data, which are wire- connected with the data terminals 6a-6c of a personal computer and the like are radio-connected by a frequency hopping system. The radio communication parts 32a-32c and 42a-42c of the respective radio communication terminals 3a-3c and 4a-4c make the call with the frequency which is selected at random from the plural call frequencies at every first period at the time of calling. The call frequency is selected among the plural call frequencies at every period longer than the period so as to wait for reception in a reception standby state. |
