Advantech ADAM-4571 User Manual page 45

Command Listen Port
Each port has its own command listen port to accept connected request of
other network device. So, the command listen port can't be set the same
value. You can use 'AT command' to change the port setting via the com-
mand listen port. The Command Listen Port should be different from the
Data Listen port.
Data Idle Timeout
The default is 60 seconds. If you want to keep connection continually,
you can disable the Data Idle Timeout. Data idle Time is the time period
in which the device waits for data. If the ADAM-4571/4570 does not
receive data over an established idle time, the ADAM-4571/4570 will
disconnect temporarily. When the data comes to the ADAM-4571/4570,
it will reconnect automatically. Users do not need to reconnect.
Enable Time Sharing
The ADAM-4571/4570 provides Multi-access function through Ethernet
connection path. Allow the maximum of 5 connections to open one serial
port simultaneously. In the mode, all connection has 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 operating mode of Multi-access function. One is Normal
mode; another is Round-Robin mode.
• Normal Mode
Disabling "Response Timeout" parameter, the ADAM-4571/4570 will
operate in "normal mode". When multiple hosts open the serial port
simultaneously, the ADAM-4571/4570 only offers control ability for the
first connected host and 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 simulta-
neously. Every host can transmit data to the same serial port, and the
ADAM-4571/4570 will also transmit data to every hosts. When the multi-
ple 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 ADAM-4571/4570 receives data from serial port, the data will
also be transmitted to the connected hosts simultaneously.
37 Chapter 3