Abstract: When earthquake occurs in our country, the Headquarters for Earthquake Disaster Mitigation starts up. The top leader of the country will assume the commander. Those who are in the assistant hall will be awaiting the commander′s orders. There are many telephones in the assistant hall. To keep the communication work properly is very important. During the course of disaster mitigation, technologist dials the number for commander, commander will give orders via the phone to ministries and commissions who are on call in assistant hall. Programming to serial communication of MODEM will be introduced in this paper. The telephone dialer's software can configure or direct dial phone number so that we will never use the paper telephone directory, so we can work with higher efficiency.

Key words: MODEM, Serial communication, Mscomm control