11-4
LaserSpeed Pro 8500-4 Instruction Handbook:
Profibus DP™
11.3 Profibus PKW Header
The PKW header is used to communicate with the LaserSpeed Pro internal database. The PKW re-
quest/response bytes appear in the first 8 bytes of the Profibus data. The meaning of the PKW header bytes
is the same for requests (from the master) and responses (from the gauge).
The PKW header is used to get or set gauge settings, calibration information, or specific internal measure-
ment data values.
The PKW header is exactly 8 bytes, and appears before the I/O data. The PKW header format is the same
for the output data (requests from the master) and input data (responses from the gauge). All values are in
little-endian format.
Bit:
15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
Word
0:
Response Code
T Command Code
Word
1:
Command Qualifier
Word
2:
Command/Response Data
Word
3:
T: Toggle Bit
The LaserSpeed Pro gauge processes the output data PWK request header under the following circumstanc-
es:
The command code is different from the last command code processed
The command qualifier is different from the last command qualifier processed
The command code represents a “read long” or “read float” request. This allows the master to con-
tinuously read a single database item without needing to issue an intervening request.
A Profibus master should always keep the “response code” bits clear in the input data PKW request
header.
The LaserSpeed Pro gauge mak
es no direct use of the “toggle bit,” other than to reflect the state of the toggle
bit in the output data request PKW header within the input data response PKW header. This is done whether
or not the LaserSpeed Pro gauge processed the command.
Summary of Contents for BETA LaserMike LaserSpeed Pro 8500-4
Page 8: ...iv LaserSpeed Pro 8500 4 Instruction Handbook Caution LS8500 4E Labels LS8500 4X Labels ...
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Page 28: ...3 8 LaserSpeed Pro 8500 4 Instruction Handbook Installing the System ...
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Page 298: ...14 8 LaserSpeed Pro 8500 4 Instruction Handbook Dimensions and Installation Drawings ...
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