Fieldbus Interface
PR 5220 Instrument Manual
EN-136 Sartorius
7.2 Description of the I/O Area (Read / Write Window)
Input Area
Data transmission from the master to the PR 5220 (slave) is via the input area.
Weight or data requests are transmitted to the slave by the master.
The master has write access; the slave has read access.
e.g. limit value
"
2 :::
"
"
e.g. gross weight
Write:
Reset/set marker
Get
FixTare
Set
FixTare
Res
Power
Res
Test
Set
Test
Res
Tare
Set
Tare
Set
Zero
Control byte,
response to
0->1
transition
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
The
control byte activates the corresponding action in the instrument with a set bit.
After execution of the operation, the bit should be reset.
Function
Write_Value
The weight value is transmitted as a binary 32-bit value with plus or minus sign.
Data type:
Read_Value_Select
For selecting the value sent by the instrument
For selecting the function to be executed by the instrument
Reset marker 1…3.
Set M 1…3
Set marker 1…3.
The gross weight is copied into the fixtare memory.
Taring is performed using the value stored in the fixtare memory.
The
bit in the output area is deleted.
The test operating mode is finished.
SetTest
The test operating mode is started. Now the test value can be read out by reading
out the gross weight.
Tare is reset.
The scale is tared.
The scale is set to zero.
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