ProSoft Technology AN-X-PB User 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