Option Description
Any Character/
Inactivity Time
A TCP connection will be established when any character is received from the serial
interface, and will be disconnected when Inactivity time is reached.
DSR On/DSR Off A TCP connection will be established when a DSR “On” signal is received, and will
be disconnected when a DSR “Off” signal is received.
DSR On/None A TCP connection will be established when a DSR signal of NPort is “On”, and will
remain active indefinitely.
DCD On/DCD Off
remain active indefinitely.
Packet length (default=0): This field 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.
Delimiter process (default=Do Nothing): The Delimiter process field determines how the data is handled
when a delimiter is received. Delimiter 1 must be enabled for this field to have effect. If Delimiters 1 and 2 are
both enabled, both characters must be received for the delimiter process to take place.
• Do Nothing: Data in the buffer will be transmitted when the delimiter is received.
• Delimiter + 1: Data in the buffer will be transmitted after 1 additional byte is received following the
delimiter.
• Delimiter + 2: Data in the buffer will be transmitted after 2 additional bytes are received following the
delimiter.
• 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 CN2600
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 CN2600 in the internal buffer. The CN2600
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 larger than 8.3 ms, so in this case, it must be greater
than or equal to 10 ms.
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