SENA PS210W - Manual (Page 50)

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host configuration. On the contrary if Accept unlisted function is set as ‘Yes’, Pro Series will
accept all incoming UDP datagram regardless remote host configuration.
Send to recent unlisted remote host
If Send unlisted (Send to recent unlisted remote host) function is set as ‘Yes’, Pro Series sends
data to the remote host, which has connected Pro Series recently. Recent unlisted remote host is
a remote host, which has accessed a corresponding serial port of Pro Series but is not configured
on remote host configuration. Surely, Pro Series also send data to the hosts, which are configured
on remote host configuration. If Send unlisted function is set as ‘No’, Pro Series sends data only
to the host(s) which are configured on remote host configuration. Pro Series maintains a recent
unlisted remote host during the Inactivity Timeout.
Inactivity Timeout
In UDP mode, Inactivity Timeout is used in maintaining recent unlisted remote host. If there is no
data transmission between unlisted remote host and serial port of Pro Series during Inactivity
Timeout, Pro Series will not send data from a serial port to the recent unlisted remote host again.
Namely, Inactivity Timeout in UDP mode is the time maintained recent unlisted remote host list by
Pro Series.
Note : If user set Inactivity Timeout as 0 in UDP mode, Pro Series does not allow any new
connection from/to remote host if the number of current remote host exceeds Max. allowed
connection.
Socket ID
When many Pro Series devices connects a same remote host(s), sometimes it is needed to
identify the device. In this case, Socket ID is available for identification of each device. Pro Series
send the Socket ID string before starting the data transmission. User can define Socket ID with a
specific string. In UDP mode, specified Socket ID strings are added to the head of every packet.
4.2.3.3. Modem emulation mode
1) Operations
In modem emulation mode, the serial port process acts as if it is a modem attached to the serial
device. It accepts AT modem commands and answers to them, as modems would do. It also handles
the modem signals correctly. Modem emulation mode is useful in the following cases.
There already exists a modem attached to the users’ serial device.
If users’ serial device already has a modem for phone-line connection, it can be just replaced by