Method and apparatus for serial data flow control

Details Method and apparatus for serial data flow control Method and apparatus for serial data flow control

G - Physics

06

F

354/105

G06F 11/34 (2006.01) G06F 13/38 (2006.01) H03M 9/00 (2006.01) H04L 12/56 (2006.01) H04L 29/06 (2006.01)

Patent

CA 2025753

Method and Apparatus for Serial Data Flow Control A data flow controller (150). A serial communications card (11) provides an interface between a remote transmitter connected to a serial port connector (20) and a host device (10). The card (11) contains a UART (14) which has a buffer. A counter (151) counts the number of bytes received by the UART (14) since the last time that the host (10) read all the data in the buffer. If the number exceeds a predetermined portion of the buffer capacity the counter output (Q11) will go high, thereby disabling the counter and sending a control signal (DTR, RTS) to the remote transmitter to stop sending data. Once the host (10) has read all the data in the buffer the UART (14) provides a signal (-RXREADY) which resets the counter (151), thereby causing the output (Q11) to go low, thereby allowing the remote transmitter to resume sending data. The counter (151) is held in a reset state until the buffer has received at least one byte of data. Data flow control is therefore obtained without the intervention of the host (10).

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