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51 EKI-1321/1322 User Manual

Chapter 5 Web Configuration

Response Timeout: For normal mode, you need to disable this field. For round-

robin mode, you need to enable this field. The detailed configuration is described in

following chapter.

EKI-1321/1322 provides Multi-access function through cellular WAN. Allow the maxi-

mum of five connections to open one serial port simultaneously. In the mode, all con-

nections have to use the same serial setting. If one serial setting of these

connections is different from others, the data communication may operate incorrectly.

There are two kinds of Multi-access function. One is Normal mode; another is Round-

Robin mode.

Normal mode: Disabling “Response Timeout” parameter, EKI-1321/1322 will operate

in “normal mode”. When multiple hosts open the serial port simultaneously, the EKI-

1321/1322 only offers control ability to the first connected host but also provides data

communication function for others. 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, and EKI-1321/

1322 will also transmit data to every host. But, while multiple hosts transmit data to

the same serial port at almost same time (there still have the order of arrival), the

received data from serial device (this should be required by the first order of arrival)

will be transmitted to the connected hosts simultaneously. This causes hosts receive

incorrect data except the host who has the first order of arrival.

Round-Robin mode: Enabling "Response Timeout" parameter, the EKI-1321/1322

will operate in "Round-Robin mode". Each serial port supports up to five simultane-

ous 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 simultane-

ously, but EKI serial device server will process the data communication in order. EKI-

1321/1322 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 acknowledge-

ment 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-1321/1322 can transmit data

more efficiently. Disabling the Frame Break function, EKI-1321/1322 will wait for data

until "Response Timeout" setting time is reached. During this period, the commands

from hosts will be queued and EKI-1321/1322 just processes this command.

Enabling "Frame Break", if the serial port idle is longer than the "Frame Break"

period, EKI-1321/1322 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.

Note! This operating mode is suitable for the one major host send the com-

mand and others hosts just listen the data from serial port. If two of con-

nected hosts send the command at the same time, it is possible that EKI

serial device server will not handle the command and will response the

incorrect data.

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