User`s manual

NPort 6000 Series User’s Manual Configuring Serial Port Operation Modes
7-20
Dial-out
The NPort 6000 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. Here 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, the NPort 6000 will send out the
CONNECT baud” signal via the serial port and then enter data mode.
Disconnection request from local site
When the NPort 6000 is in data mode, the user can initiate disconnection by sending “+++” from
the local serial port to the NPort 6000. Some applications allow you to directly set the DTR signal
to off, which will also initiate disconnection. The NPort 6000 will enter command mode, and after
1 second, you can then enter “ATH” to shut down the TCP connection The NPort 600 0 will return
a “NO CARRIER” via the serial port.
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, the NPort
6000 will send the “NO CARRIER” signal via the serial port and then return to command mode.