Communication sequence, data circuit-terminating equipment, data terminal equipment, and storage medium storing communication control program

摘要

A DCE sends a first command to a DTE if data transmission from the DCE has not ended at a predetermined timing after the end of data transfer from the DTE to the DCE. The DTE sends a second command to the DCE at an arbitrary timing upon reception of the first command. Upon reception of the second command, the DCE sends to the DTE the first command if data transmission has not ended, or a third command if data transmission has ended. The DTE and DCE execute a post-data transmission procedure after they exchange the third command.