OnCell G3100 Series Configuring Serial Port Operation Modes
The OnCell G3100 accepts the AT command ATD <IP address:TCP port> (for example, ATD
192.168.127.1:4001) from the serial port and then requests a TCP connection from the remote Ethernet
Modem or PC. Here IP address 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
OnCell G3100 will send out the “CONNECT baud” signal via the serial port and then enter data mode.
TCP alive check time (default=7 min): This field specifies how long the OnCell G3100 will wait for a response
to “keep alive” packets before closing the TCP connection. The OnCell G3100 checks connection status by
sending periodic “keep alive” packets. If the remote host does not respond to the packet within the time
specified in this field, the OnCell G3100 will force the existing TCP connection to close. For socket and device
control modes, the OnCell G3100 will listen for another TCP connection from another host after closing the
connection. If TCP alive check time is set to 0, the TCP connection will remain open even if there is no
response to the “keep alive” packets.
TCP port (default=4001): This is the TCP port number assignment for the serial port on the OnCell G3100. It
is the port number that the serial port uses to listen to connections, and that other devices must use to contact
the serial port. To avoid conflicts with well-known TCP ports, the default is set to 4001.
Dial-in
The OnCell G3100 listens for a TCP/IP connection request from the remote Ethernet modem or host. The OnCell
G3100’s response depends on the ATS0 value, as follows.
ATS0=0:
The OnCell G3100 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 the OnCell G3100 enters data mode. If no ATA command is received, the OnCell G3100 will disconnect
after sending three RING signals.
ATS0
1:
The OnCell G3100 will accept the TCP connection immediately and then send the “CONNECT baud” command
to the serial port, in which baud represents the baudrate of the OnCell G3100’s serial port. After that, the
OnCell G3100 immediately enters data mode.
Dial-out
The OnCell G3100 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 OnCell G3100 will send out the CONNECT baud” signal via the serial port and then
enter data mode.
Disconnection request from local site
When the OnCell G3100 is in data mode, the user can initiate disconnection by sending “+++” from the local
serial port to the OnCell G3100. Some applications allow you to set the DTR signal to off, which will also initiate
disconnection. The OnCell G3100 will enter command mode, and after 1 second, you can then enter ATH to
shut down the TCP connection. The OnCell G3100 will return a NO CARRIER via the serial port.
The “+++” command cannot be divided. The “+” character can be changed in register S2, and the guard time,
which pr
efixes and suffixes the “+++” in order to protect the raw data, can be changed in register S12.
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