INFICON BCG450-SP ATM to Ultra-High Vacuum Triple Gauge (Profibus) - Manual (Page 6)

6
tira41e1 (2005-06) BCG450SPv1.cp
Depending on the pressure unit setting (
data unit), the following configuration
string has to be transmitted to the gauge (parameter data in hexadecimal format):
Pressure unit User parameter data string
COUNTS 1) 00 00 00 03 E9
Torr 00 00 00 05 15
Micron 00 00 00 05 16
mbar 00 00 00 05 1C
Pascal 00 00 00 05 1D
1)
If COUNTS is selected as pressure unit, a value is output, which can be con-
verted into a corresponding pressure value by means of a formula (
→ section
"Analog Sensor Input Function Block" for more information).
BCG450-SP works according to the Profibus DPV1 specification and can be
addressed in cyclic or acyclic data traffic (
→ [4]).
Acyclic data traffic should be used to make device or process specific settings such
as definition of the Safe Values, Safe States etc. or for reading or writing of rarely
used attributes.
Cyclic data traffic is used for continuous exchange of the required process para-
meter values, i.e. pressure value and status indications. A number of standard
telegrams are available for cyclic data traffic. They can be selected according to
requirements (
→ section "Cyclic Message Telegrams").
1.5 User Parameter Data
1.6 Types of
Communication