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The Host Idle Timeout setting monitors the connection between the host and the
device. If the Host Idle Timeout setting time is reached, the device server will release
the resources allocated to the port mapping. This prevents a stalled host from
affecting the connective device.
The Multi-access function has two modes. One is Normal mode and the other is
Round-Robin mode.
4.2.1
Normal mode
By disabling the Response Timeout parameter, the EKI-1511L will operate in normal
mode. When multiple hosts simultaneously open the serial port, only the first
connected host obtain management control, the remaining connections only have
data communication function. 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 the EKI-
1511L will also transmit data to every hosts. When the multiple hosts transmit data to
the same serial port at the same time, the received data from Ethernet and the
outputs of serial port are mixed. When the EKI-1511L receives data from serial port,
the data will also be transmitted to the connected hosts simultaneously.
4.2.2
Round-Robin mode
By enabling the Response Timeout parameter, the EKI-1511L Series operates in
"Round-Robin mode". Each serial port supports up to five simultaneous connections
allowing hosts to simultaneously transmit/receive data to/from the same serial port.
Every host can simultaneously transmit data to the same serial port, EKI-1511L
processes the data in the order arrived. The EKI-1511L processes the first host's
request and replies. The serial device server determines the end of the serial
acknowledgment through a response timeout. When EKI-1511L serial device server
does not receive a response from the serial port after a response timeout query, the
device replies with an acknowledgment and then processes the next host request.
With an increased number of hosts, response time may be lengthy, increasing the
period of the Response Timeout.
Frame Break is an important parameter for Round Robin mode. The parameter is a
smart method of reducing ineffective waiting periods and streamlining the
transmission process.
If the Frame Break function is disabled, EKI-1511L devices will wait for a "Response
Timeout" period, whether or not the device has transmitted data. During this period,
the host commands are queued and processed in the order received.
If Frame Break is enabled, the serial port idle is longer than the Frame Break period.
The EKI-1511L assumes the communication is completed and continues with the
next query. This is an efficient way to reduce waiting time and improve performance.
EKI-1511L User Manual
Figure 4.2 Configuring Virtual COM Mode
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