ProSoft Technology AN-X-PB - Manual (Page 35)

AN-X-PBCAPT Page 31
TIP Use parentheses freely in your equations to avoid problems associated
with precedence of operators.
Keywords
The equation can include the following keywords, which are described in
detail below.
Keyword Description
STS Frame status
Len Date length, does not include the checksum
SD Start delimiter
DA Frame destination
SA Frame source
FC Frame control
DSAP Destination SAP
SSAP Source SAP
DataByte[ofs] Data byte at byte offset ‘ofs’ into the frame data
DataWord[ofs] Data word at byte offset ‘ofs’ into the frame data
CmdArg[num] Passed parameters, see page 35
GapTme Gap time, in microseconds, see page 21
Frame Status, STS
The frame status can be one of the following:
Symbolic name Value Description
STSSTP 0x01 Stop bit error
STSPAR 0x02 Parity bit error
STSSD 0x04 Invalid Start Delimiter
STSRPT 0x08 Start Delimiter Repeat error
STSUND 0x10 Frame Underrun
STSOVR 0x20 Frame Overrun
STSCHK 0x40 Checksum Incorrect
STSED 0x80 Invalid End Delimiter