OnCell G3100 Series Configuring Serial Port Operation Modes
• Strip Delimiter: Data in the buffer is first stripped of the delimiter before being transmitted.
Force transmit (default=0 ms): This parameter defines how large a gap in serial communication the OnCell
G3100 will allow before packing the serial data in its internal buffer for network transmission.
As data is received through the serial port, it is stored by the OnCell G3100 in the internal buffer. The OnCell
G3100 transmits data stored in the buffer via TCP/IP, but only when the internal buffer is full or as specified by
the force transmit time. When set to 0, the force transmit time is disabled, and transmission is determined
solely by the data in the internal buffer. At 1 to 65535, the TCP/IP protocol software will pack the serial data
received after there is a gap in serial communication that exceeds the specified force transmit time.
The optimal force transmit time depends on your application, but it must be at least larger than one character
interval within the specified baudrate. For example, assume that the serial port is set to 1200 bps, 8 data bits,
1 stop bit, and no parity. In this case, the total number of bits needed to send a character is 10 bits, and the
time required to transfer one character is
(10 (bits) / 1200 (bits/s)) × 1000 (ms/s) = 8.3 ms.
Therefore, you should set the force transmit time to be greater than 8.3 ms, so in this case, it must be greater
than or equal to 10 ms.
If it is necessary to send a series of characters in the same packet, the serial device will need to send that series
of characters within the specified force transmit time, and the total length of data must be less than or equal
to the OnCell G3100’s internal buffer size (1 KB per port).
RFC2217 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.
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