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is ignored in sequence matching (wild-card character). The last specific character of a
character sequence terminates that start condition sequence.
Incoming sequences are evaluated against the configured start conditions until a start
condition has been satisfied. Once the start sequence has been satisfied, evaluation of end
conditions begins.
You can configure up to four specific character sequences. You use a multiple-sequence
start condition when different sequences of characters can indicate the start of a message. If
any one of the character sequences is matched, the message is started. The order of checking start conditions is:
● Idle line
● Line break
● Characters or character sequences
While checking for multiple start conditions, if one of the conditions is not met, the CM or CB
will restart the checking with the first required condition. After the CM or CB establishes that
the start conditions have been met, it begins evaluating end conditions. With this configuration, the start condition is satisfied when either pattern occurs:
● When a five-character sequence is received where the first character is 0x6A and the fifth
character is 0x1C. The characters at positions 2, 3, and 4 can be any character with this
configuration. After the fifth character is received, evaluation of end conditions begins.

When two consecutive 0x6A characters are received, preceded by any character. In this
case, evaluation of end conditions begins after the second 0x6A is received (3
characters). The character preceding the first 0x6A is included in the start condition.
Example sequences that would satisfy this start condition are:
● <any character> 6A 6A
● 6A 12 14 18 1C
● 6A 44 A5 D2 1CYou also configure how the communication interface recognizes the end of a message. You
can configure multiple message end conditions. If any one of the configured conditions
occurs, the message ends.
For example, you could specify an end condition with an end of message timeout of 300
milliseconds, an inter-character timeout of 40 bit times, and a maximum length of 50 bytes.
The message will end if the message takes longer than 300 milliseconds to receive, or if the
gap between any two characters exceeds 40 bit times, or if 50 bytes are received. The message end occurs when the configured amount of time to wait for a response
expires before a valid start sequence is received. The response timeout period begins
when a transmission ends and the CM or CB begins the receive operation. The default
response timeout is 200 ms and the range is 0 to 65535 ms. If a character is not received
within the response time period, RCVTIME, then an error is returned to the corresponding
RCV_PTP instruction. The response timeout does not define a specific end condition. It
only specifies that a character must be successfully received within the specified time. You
must configure another end condition to indicate the actual end of a messagThe message end occurs when the configured amount of time to wait for the message end
has expired. The message timeout period begins when a start condition has been satisfied.
The default is 200 ms and the range is 0 to 65535 ms. The message end occurs when the maximum configured timeout between any two
consecutive characters of a message has expired. The default value for the inter-character
gap is 12 bit times and the maximum number is 65535 bit times, up to a maximum of eight
seconds. Received characters
② Restarts the intercharacter timer
③ The intercharacter timer expires and terminates the message.
Recognize message end by
max length
The message end occurs when the configured maximum number of characters has been
received. The valid range for maximum length is 1 to 1023.
This condition can be used to prevent a message buffer overrun error. When this end
condition is combined with timeout end conditions and the timeout condition occurs, any
valid received characters are provided even if the maximum length is not reached. This
allows support for varying length protocols when only the maximum length is known.
Read message length from
message
The message itself specifies the length of the message. The message end occurs when a
message of the specified length has been received. The method for specifying and
interpreting the message length is described below.
Recognize message end
with a character
The message end occurs when a specified character is received.
Recognize message end
with a character sequence
The message end occurs when a specified character sequence is received. You can
specify a sequence of up to five characters. For each character position, you specify either
a specific hex character, or that the character is ignored in sequence matching.
Leading characters that are ignored characters are not part of the end condition. Trailing
characters that are ignored characters are part of the end conditionIn this case, the end condition is satisfied when two consecutive 0x7A characters are
received, followed by any two characters. The character preceding the 0x7A 0x7A pattern is
not part of the end character sequence. Two characters following the 0x7A 0x7A pattern are
required to terminate the end character sequence. The values received at character
positions 4 and 5 are irrelevant, but they must be received to satisfy the end condition.
Specification of message length within the message
When you select the special condition where the message length is included in the message,
you must provide three parameters that define information about the message length.
The actual message structure varies according to the protocol in use. The three parameters