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ously. Every host can transmit data to the same serial port simultaneously, but
the EKI device will process the data communication in order. The EKI device will
process the first host's request and reply the response to the first host. The EKI
device serial device server can determine the end of the serial acknowledge-
ment via response timeout. When EKI device serial device server receives noth-
ing from serial port after the setting of response timeout, the device will reply the
acknowledgement to the host and then process the next host's request. While
the connected hosts are more and "Response Timeout" is long, the process
time is much longer.
Frame Break is a very import parameter for Round Robin mode. This parameter
is the smart way to reduce inefficient waiting time and the EKI device can trans-
mit data more efficiently. Disabling the Frame Break function, the EKI device will
wait "Response Timeout" period, whether the device have transmitted the data.
During this period, the commands from hosts will be queued and the EKI device
just processes this command. Enabling "Frame Break", if the serial port idle is
longer than the "Frame Break" period, the EKI device will assume the communi-
cation is completed and continue the next host's query. This is an efficient way
to reduce the waiting time and improve the performance.
5.6.2.2
Data Mode (USDG Mode)
The EKI device can be Data server or Data client either. Both operations support
TCP and UDP protocol. The EKI device makes your serial devices behave just like
networking devices. You can issue commands or transmit data from serial devices,
which connected to the EKI device, to any devices that are connected to the Internet.
The EKI device allows most 5 host PCs accessing data simultaneously via polling
networking architecture. You can use it according to your application. If you want to
access the EKI device, you must ascertain your application software supports stan-
dard networking application programming interface (API) such as: WinSock Socket.
You might select "USDG Mode" as the following figure to change the mode of the port
to TCP server/client or UDP mode.
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EKI-1361/EKI-1362 User Manual
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