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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.

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 the

Pro Series for Ethernet connection. What users need to do is to use an IP address (or domain name)

and port number 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) and port number parameters whenever the device sends ATD(T) XXX command.

By using the modem emulation mode of the Pro Series, users can have their serial device connected

to the Ethernet network easily, which is cheaper than using phone line modem. Table 4-2 is a

summarized AT command table which is supported by the Pro Series. Figure 4-7 shows the typical

case of the serial port command flow when ATDA command is used to connect to the Ethernet network.

Table 4-2 AT commands supported in the Pro Series

Command Internal Operation Response

(Verbose Code)

+++ Return to command input mode None

If Echo mode is enabled, the command will be sent back first. And then, corresponding response will be sent. If disabled, only

response will be sent.

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