Fieldbus Protocols - Precise Instrument DAT 400 Technical Manual

FIELDBUS data exchange takes place on two separate memory areas, which are described in the
tables below.
WARNING:
The "Input Data Area" and the "Output Data Area" are of 128 bytes
To transfer the parameters of the Output Data Area to the instrument you need to enable direct access
to the memory, writing the hexadecimal value 0x7FFF in the Command Register (1 word in writing) in
order to avoid that the instrument resets all its variables in the case of uninitialized Output Data Area
This command must be sent before the connection to inform the instrument that the parameters have
been initialized by the master. Now, the instrument continually tests the changes made to the parameters
and stores them only in case of real change.
INPUT DATA AREA
ADDRES
Byte Bit
0 0
0 1
0 2
0 3
0 4
0 5
0 6
0 7
1 0
1 1
1 2
1 3
1 4
1 5
1 6
2 0
6 0
10 0
14 0
16 0
18 0
20 0
21 0
21 1
21 2
21 3
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FIELDBUS PROTOCOL
Description
Keyboard_Look
Memory_Flag
Input_1
Input_2
Output_1
Output_2
Spare
Spare_1
Center_of_Zero
Stable_Weight
Zero_Band
Tare_entered
Under_Load
Over_Load
Off_Range
Gross_Weight
Net_Weight
Peak_Weight
Load_Cells_Signal_mV_V
Input_Status
Output_Status
Not used
SET_Key
FUN_Key
0_Key
PRG_Key
Format Note
BOOL See table A Page 45
BOOL See table A Page 45
BOOL See table A Page 45
BOOL See table A Page 45
BOOL See table A Page 45
BOOL See table A Page 45
BOOL See table A Page 45
BOOL See table A Page 45
BOOL See table A Page 45
BOOL See table A Page 45
BOOL See table A Page 45
BOOL See table A Page 45
BOOL See table A Page 45
BOOL See table A Page 45
BOOL See table A Page 45
DINT
DINT
DINT
INT
INT
INT
BYTE
BOOL See table B Page 45
BOOL See table B Page 45
BOOL See table B Page 45
BOOL See table B Page 45