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The EKI-1526NL-CS | 1528NL-CS provide Multi-access function through an Ethernet
connection path, allowing a maximum of five connections to open one serial port
simultaneously. In this mode, all connections use the same serial setting. If one serial
setting within this configuration is configured differently, the data communication will
not function correctly.
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-1526NL-CS | 1528NL-CS
Series will operate in normal mode. When multiple hosts simultaneously open the
serial port, only the first connected host has management control; the remaining
connections only have a 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-1526NL-CS | 1528NL-CS Series 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-1526NL-CS | 1528NL-CS Series 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-1526NL-CS | 1528NL-CS
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-1526NL-CS | 1528NL-CS Series processes the data in the order
arrived. The EKI-1526NL-CS | 1528NL-CS Series processes the first host's request
and replies. The console server determines the end of the serial acknowledgment
through a response timeout. When EKI-1526NL-CS | 1528NL-CS console 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 therefore an important parameter
for Round Robin mode. The parameter is a smart method of reducing ineffective
waiting periods and streamlining the transmission process.
EKI-1526NL-CS | 1528NL-CS User Manual
Figure 4.2 Configuring Virtual COM Mode
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