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LDU 68 Series Manual
Ideas in Measuring ..
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5.12 Save calibration, setup and setpoint parameters commands - CS, WP, SS, PI, GI
The setup and calibration parameters can be divided into 3 groups:
Calibration parameters: CZ, CG, DS, DP & ZT are saved by the CS command.
Setup parameters (other than setpoint): FL, FM, NR, NT, BR, AD, DX etc. are saved by the WP
command.
Setpoint parameters: S0, S1, H0, H1, A0, A1 are saved by the SS command.
Please note that the calibration parameters can only be saved if the TAC code is known and
precedes the CS command.
See the CE and CS commands on pages 18 & 20 respectively.
Both the setup parameters and the setpoint parameters are stored in EEPROM using the WP and
SS commands respectively.
WP Save the setup parameters
With this command the settings of the Filter (FL, FM), the No-motion (NR, NT) and communication
(AD, BR, DX) will be saved in the EEPROM.
Master (PC / PLC) sends
LDU XX.X responds
Result
WP
OK
Parameter saved
SS Save the setpoint setup parameters
With this command the value of the setpoints (S0 & S1), the setpoint hysteresis (H0 & H1) and the
setpoint action (A0 & A1) will be saved in the EEPROM.
Master (PC / PLC) sends
LDU XX.X responds
Result
SS
OK
Parameter saved
Issue 1h
PI Put EEPROM Image
With this command you can download a HEX-INTEL formatted EEPROM image into the LDU. The
image contains all stored information except the calibration data. The LDU must have the same
firmware type and revision as the source.
GI Get EEPROM Image
With this command you can get a HEX-INTEL formatted EEPROM image from the LDU. The
image contains all stored information except the calibration data. The image can be downloaded
into any LDU 68.x as long as it has the same firmware type and revision as this unit..
The PI and GI command must be handled by a host program able to read the hex data from the
LDU and write it to a number of other LDUs for “cloning”. These commands are useful if you want
to set up a large number of LDUs in the same way e.g. in some kind of production.
Ideas in Measuring ..
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LDU 68 Series Manual
6
CALIBRATION PROCEDURE.
Example: setup of zero point, gain and decimal point.
Master ( PC / PLC ) sends
LDU XX.X responds
Result
CE
E+00017
Request: TAC-counter CE = 17
CE_17
OK
Calibration sequence active
Scale no load !
CZ
OK
System zero point saved
CE_17
OK
Calibration sequence active
Put calibration weight on (500 g) !
CG_5000
OK
Setting span
CG
G+05000
Request: span 5000 d
CE_17
OK
Calibration sequence active
DP_1
OK
Setting: decimal point 0000.0
CE_17
OK
Calibration sequence active
CS
OK
Save calibration data in EEPROM
The calibration interface features a “TRACEABLE ACCESS CODE” (TAC), which is required for
use in “Approved” applications (see section 7, “USE IN APPROVED APPLICATIONS” for more
details). This feature also ensures that there is no inadvertent or unauthorized access to the
calibration parameters. The following parameters are considered as CALIBRATION commands:
CE
Calibration Enable - returns the current TAC value.
CZ
Calibrate zero - sets the system zero point
CG
Calibrate gain - sets the system gain
CM
Calibrate maximum - sets the maximum allowable display value.
DS
Display step size - sets the output incremental step size.
DP
Display decimal point - sets the position of the output decimal point
ZT
Zero track enable.
FD
Factory default settings (return to)
CS
Calibration save
Zero point, gain and decimal point position were saved in the EEPROM; the calibration counter
(TAC) is increased automatically by 1.
The chosen test weight has the value equivalent to 5000 increments. This could be 500 g, 5kg or
5000 kg. We will calibrate with a 500 g weight. The decimal point is set to 1 place using the DP
command. So although the CG value (5000) does not contain a decimal place the final result does
(500.0).
Issue 1h
