Data link control method for controlling receiver and transmitter

Claim 1

A data link control method for controlling a receiver and a transmitter which communicate with each other in a predetermined mode, comprising the steps of: connecting the receiver and the transmitter so that the transmitter can transmit every line of a predetermined data on a recording paper thereof at a first speed, the receiver plotting every line of the predetermined data on a recording paper thereof at a second speed; selecting the predetermined mode from either a buffer mode or a skip mode on the basis of the ratio of the first speed to the second speed and whether a buffer mode can be used by the receiver; setting a capacity of a buffer in the transmitter to be smaller than a capacity of a buffer in the receiver when the buffer mode is selected; and storing the predetermined data including data corresponding to blank lines in the buffer in the receiver, the data corresponding to blank lines being stored in the buffer in the receiver without adding a fill-bit during the buffer mode and a fill-bit representing 0 being added to the data corresponding to blank lines during the skip mode so that the transmitting operation of the transmitter can be synchronized with the plotting operation of the receiver, the recording paper of the receiver being fed at a third speed higher than a normal speed when a blank line of the predetermined data is plotted thereon during the buffer mode and skip mode.