OnCell G3100 Series Configuring Serial Port Operation Modes
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 and will not send any
“keep alive” packets.
Max connection (default=1): This field is used if you need to receive data from different hosts
simultaneously. When set to 1, only one specific host can access this port of the OnCell G3100, and the OnCell
COM driver on that host will have full control over the port. When set to 2, the specified number of hosts’ OnCell
COM driver may open this port at the same time. When multiple hosts’ OnCell COM driver open the port at the
same time, the COM driver only provides a pure data tunnel --no control ability unless “Allow Driver Control” is
enabled. The serial port parameters will use firmware settings instead of depending on your application
program (AP).
Application software that is based on the COM driver will receive a driver response of “success” when the
software uses any of the Win32 API functions. The firmware will only send data back to the driver on the host.
Data will be sent first-in-first-out when data comes into the OnCell G3100 from the Cellular or Ethernet
interface.
Max connection is greater than 1, the OnCell G3100 will use a multi connection application (i.e., 2
hosts are allowed access to the port at the same time). When using a multi connection application, the OnCell
G3100 will use the serial communication parameters as defined here in the web console, and all hosts
connected to the port must use identical serial settings. If one of the hosts opens the COM port with different
serial settings, data will not be transmitted properly.
Ignore jammed IP (default=Disable): This option determines how the port will proceed if multiple hosts are
connected and one or more of the hosts stops responding as the port is transmitting data. If you select Disable,
the port will wait until the data has been transmitted successfully to all hosts before transmitting the next group
of data. If you select Enable, the port will ignore the host that stopped responding and continue data
transmission to the other hosts.
Allow driver control (default=Disable): This option determines how the port will proceed if driver control
commands are received from multiple hosts that are connected to the port. If Disable is selected, driver
control commands will be ignored. If Enable is selected, control commands will be accepted, with the most
recent command received taking precedence.
Secure (default=Disable): If you select Enable, data sent through the Ethernet will be encrypted with SSL.
ATTENTION
If your OnCell G3100 serial port is in Real COM
or Reverse Real COM mode and is configured for SSL
encryption, make sure the COM driver is configured the same way. This is done
with Windows Driver Mana
ger,
which is installed with the
driver. Please refer to Chapter 14, Software Installation/Configuration, for more
Connection goes down (default=always high): You can configure what happens to the RTS and DTR signals
when the Cellular or Ethernet connection goes down. For some applications, serial devices need to know the
Cellular or Ethernet link status through RTS or DTR signals sent through the serial port. Use “always low” if you
want the RTS and DTR signal to change their state to low when the Cellular or Ethernet connection gets
disconnected. Use “always high” if you do not want the cellular or Ethernet connection status to affect the RTS
or DTR signals.
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