| 摘要 |
Control information on the modem for each address is stored. At the time of communication, the modem used is operated in accordance with the stored control information and a pre-communication procedure is simplified to transmit data. If the simplified pre-communication procedure does not progre ss normally, the procedure is changed to a second communication procedure with a slower speed after a predetermined lapse of time to continue the communication. If abnormality occurs after the simplified pre-communication procedure, the control information stored in a memory means are erased/updated. Therefore, the time for the pre-communication procedure is shortened and, further, the mounted shortened procedure function always operates properly even if the error rate of the communication is high or the line characteristics are changed.
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