ProSoft Technology AN-X-PB - Manual (Page 36)

Page 32 AN-X-PBCAPT November 2011
Since multiple bits may be set in STS, mask STS with the bit you wish to
examine before you make any comparisons.
Example: The following equation selects frames with checksum errors.
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(STS&STSCHK) = STSCHK
#
Example: The following equation selects all frames with errors.
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STS <> 0
#
Frame Length, Len
The length refers to the data portion of the frame but does not include the
checksum.
Example: The following equation selects frames with data lenth greater
than 10.
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Len > 10
#
Start Delimiter, SD
Possible start delimiters are:
Start delimiter Value Description
SD1 0x10 Fixed Length, No Data
SD2 0x68 Variable Length, With Data
SD3 0xa2 Fixed Length, With Data
SD4 0xdc Token Pass
SC 0xe5 Single Character, Short Ack
Example: The following equation selects frames with data start delimiter
SD1.
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SD = SD1
#