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44 CHAPTER 3: CONFIGURING THE ETHERNET ADAPTER
After configuring the port mode, you also need to configure the
following options:
■ Line Length – As data arrives on the serial port it is accumulated in a
buffer in the Ethernet Adapter. The Line length parameter sets the
maximum size for this buffer. When the number of characters in the
buffer reaches the Line length value the entire buffer is sent as the
data in a single network packet.
The value of Line length can range from 1 to 1,408 bytes. The default
value is 1,408.
Do not use values of line length less than 5 with a serial baud rate of
115,200 or greater.
■ Timeout – Often serial data arrives in small bursts of characters. When
the Ethernet Adapter receives a burst of data it will wait for a certain
period of time for additional data to be received. If additional data is
received, it is added to the receive buffer, and the Ethernet Adapter
begins to wait again. If additional data is not received for longer than
the period specified by the Timeout value, then the buffer of
characters received is sent in a single network packet, and the process
begins again.
The value of timeout is in units of milliseconds, and should be specified in
10 millisecond increments. The valid range for timeout is from 10 (0.01
second) to 65,000 (650 seconds). The default value is 10.
■ Delimiters – Some serial devices transmit and receive data in a known
structure. In these cases, there are often special characters that the
transmitting device uses to indicate a complete message has been
sent. These characters are referred to as delimiters. You can specify up
to five different delimiting characters to the Ethernet Adapter. When
the Ethernet Adapter adds one of these characters to its buffer of
serial received characters, it will immediately send that buffer as a
network packet.
The value of delimiters is specified as a list of hexadecimal values
separated by spaces. You may specify up to five different delimiter
values. For example, if you want to use the delimiter 41375, you must
type the following hex values:
0x34 0x31 0x33 0x39 0x35
If you are unsure of the hex value for your delimiter character, consult
the Web page www.asciitable.com for reference.