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NPort 5100 Series User’s Manual
Web Console Configuration
5-24
Ethernet Modem Mode
Dial-in
NPort 5100 listens for a TCP/IP connection request from the remote Ethernet modem or host.
NPort 5100’s response depends on the ATS0 value, as outlined below.
ATS0=0 (default):
NPort 5100 will temporarily accept the TCP connection and then send the “RING” signal out
through the serial port. The serial controller must reply with “ATA” within 2.5 seconds to accept
the connection request, after which NPort 5100 enters data mode. If no “ATA” command is
received, NPort 5100 will disconnect after sending three “RING” signals.
ATS0
≧
1:
NPort 5100 will accept the TCP connection immediately and then send the “CONNECT <baud>”
command to the serial port, in which <baud> represents the baudrate of NPort 5100’s serial port.
After that, NPort 5100 immediately enters data mode.
Dial-out
NPort 5100 accepts the AT command “ATD <IP>:<TCP port>” from the serial port and then
requests a TCP connection from the remote Ethernet Modem or PC. This is where <IP> is the IP
address of the remote Ethernet modem or PC, and <TCP port> is the TCP port number of the
remote Ethernet modem or PC. Once the remote unit accepts this TCP connection, NPort 5100
will send out the “CONNECT <baud>” signal via the serial port and then enter data mode.
Disconnection request from local site
When NPort 5100s is in data mode, the user can drive the DTR signal to OFF, or send “+++” from
the local serial port to NPort 5100. NPort 5100 will enter command mode and return “NO
CARRIER” via the serial port, and then input “ATH” to shut down the TCP connection after 1
second.
NOTE
The “+++” command cannot be divided. The “+” character can be changed in register S2, and the
guard time, which prefixes and suffixes the “+++” in order to protect the raw data, can be
changed in register S12.
Disconnection request from remote site
After the TCP connection has been shut down by the remote Ethernet modem or PC, NPort 5100
will send the “NO CARRIER” signal via the serial port and then return to command mode.
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