SENA STS Series - Manual (Page 48)

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 Send to recent unlisted remote host
If Send to recent unlisted remote host function is set as ‘Yes’, STS Series sends data to the remote
host, which has connected STS Series recently. Recent unlisted remote host is a remote host, which
has accessed a corresponding serial port of STS Series but is not configured on remote host
configuration. Surely, STS Series also send data to the hosts, which are configured on remote host
configuration. If Send to recent unlisted remote host function is set as ‘No’, STS Series sends data
only to the host(s) which are configured on remote host configuration. STS 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 STS Series during Inactivity Timeout,
STS 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 STS Series.
If user set Inactivity Timeout as 0 in UDP mode, STS Series does not send any data from serial port to
unlisted remote host.
 Socket ID
When STS Series connects remote host(s), sometimes it is needed to identify the device using the
string. In this case, if user specifies specific strings in Socket ID, STS Series send these strings first
before start the data transmission. User can specifies either Serial Numebr or specific strings up to 49
characters as Socket ID. (This option can be changed only by root user) In UDP mode, specified
Socket ID strings are added to every packet.
4.2.4.3. Modem Emulation Mode
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 the
STS Series for Ethernet connection. What users need to do is to use an IP address (or domain name)
instead of phone number as a parameter of ATA/ATDT commands.
 It is required to send serial data to the multiple remote hosts.
If the serial device should send data to the multiple hosts, modem emulation mode is required. For
example, the first data from the serial device can be sent to the first data acquisition server and the
second to the second server. What user device has to do is to change the IP address (or domain
name) parameter whenever the device sends ATD(T) XXX command.