EKI-1351/1352 User Manual 38
Round-Robin mode: Enabling “Response Timeout” parameter, the EKI-1351/
1352 will operate in “Round-Robin mode”. Each serial port supports up to five
simultaneous connections, so multiple hosts can transmit/receive data to/from
the same serial port simultaneously. Every host can transmit data to the same
serial port simultaneously, but EKI serial device server will process the data
communication in order. EKI-1351/1352 will process the first host’s request and
reply the response to the first host. If EKI serial device server receives nothing
from serial port after a period of time set by user in "Response Timeout" block,
the device server will reply the acknowledgement to the host and then process
the next host’s request. The cycle time will be increased when you increase
either the number of the connected hosts or the value of "Response Timeout".
Frame Break is a very import parameter for Round Robin mode. This parameter
is a smart way to reduce inefficient waiting time and EKI-1351/1352 can transmit
data more efficiently. Disabling the Frame Break function, EKI-1351/1352 will
wait for data until "Response Timeout" setting time is reached. During this
period, the commands from hosts will be queued and EKI-1351/1352 just
processes this command. Enabling “Frame Break”, if the serial port idle is longer
than the “Frame Break” period, EKI-1351/1352 will assume the communication
is completed and continue the next host’s query. This is an efficient way to
reduce the waiting time and improve the performance.
3.4.3 Setting TCP/UDP Server/Client Operating Mode ParametersEKI-1351/1352 provides various operating modes. Selecting the "USDG Mode" as
below to change the mode of the port to TCP server/client or UDP mode. Before
setting the TCP server mode, you have to check the serial port setting in advance.