User`s manual

OnCell G3111/G3151/G3211/G3251 Series User’s Manual Serial Port Operation Modes
8-11
ATTENTION
If used, the Inactivity time setting should be greater than the Force transmit time. To prevent
the unintended loss of data due to the session being disconnected, it is highly recommended that
this value is set large enough so that the intended data transfer is completed.
Max connection (default=1): This field is used if you need to receive data from different hosts
simultaneously. When set to 1, only a single host may open the TCP connection to the serial port.
When set to 2, the specified number of hosts may open this port at the same time. When multiple
hosts establish a TCP connection to the serial port at the same time, the OnCell
G3111/G3151/G3211/G3251 will duplicate the serial data and transmit it to all the hosts. Cellular
or Ethernet data is sent on a first-in first-out basis to the serial port when data comes into the
OnCell G3111/G3151/G3211/G3251 from the Cellular or Ethernet interface.
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.
TCP port (default=4001): This is the TCP port number assignment for the serial port on the OnCell
G3111/G3151/G3211/G3251. 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.
Command port (default=966): The Command port is the TCP port for listening to SSDK
commands from the host. In order to prevent a TCP port conflict with other applications, the user can
set the Command port to another port if needed.
Packet length (default=0): The Packet length setting refers to the maximum amount of data that
is allowed to accumulate in the serial port buffer before sending. At the default of 0 for packet
length, no maximum amount is specified and data in the buffer will be sent as specified by the
delimiter settings or when the buffer is full. When a packet length between 1 and 1024 bytes is
specified, data in the buffer will be sent as soon it reaches the specified length.
Delimiter 1 and Delimiter 2 (default=None): When Delimiter 1 is enabled, the serial port will clear
the buffer and send the data to the Ethernet port when a specific character, entered in hex format, is
received. A second delimiter character may be enabled and specified in the Delimiter 2 field, so that
both characters act as the delimiter to indicate when data should be sent.
ATTENTION
In order to enable a delimiter, packet length must be set to 0. Delimiter 2 should only be enabled
in conjunction with Delimiter 1 and never on its own; otherwise there may be data errors. Even
when a delimiter is enabled, the OnCell G3111/G3151/G3211/G3251 will still pack and send the
data when the amount of data exceeds 1 KB.