Abstract: A system for transferring data from a data source such as a host computer to a data utilization device such as a remote high-speed line printer comprises a transmitter, communications circuit and receiver. The transmitter has a central processor which controls the transfer of data from an input section via a one line buffer to a communications storage buffer. The rate of transfer of data from the one line buffer is regulated by the available storage capacity of the communications storage buffer, with the higher the capacity the faster the rate of transfer.