DAD 141.1 Technical Manual, Rev. 2.5 – April 2015
Page 38 of 54
10.5. Taring and Zeroing Commands
– SZ, RZ, ZN, ST, RT, TN, RW, TI
The following commands allow you to set and reset the zero and tare values. The zero set up during calibration
remains the ‘true zero’ but the new ‘current zero’ can be set up by using the SZ command. If the SZ command
is issued and accepted then all weight values will then be based on the new ‘current zero’. Please remember
that the zero value will be subject to the Zero tracking function if enabled. If the weight signal is not stable (as
defined by the
‘No motion’ range NR and the ‘No motion’ time NT) then both, the set zero SZ and set tare ST
commands, will be disabled.
See chapter 11 -
Use in “Approved” applications.
10.5.1. SZ Set System Zero
[
Index 0x2061
]
This comman
d sets a new “current zero” which is then the basis of all weight values until further updated by the
zero tracking function, another SZ command or the “reset zero” command RZ.
Master (PC / SPS) sends
Slave (DAD 141.1) responds
Meaning
SZ
OK
Set zero performed
The SZ command will fail (DAD 141.1
responds with ERR) if the new “current zero” is outside the active
+/- zero range set with the ZR command.
The SZ command will also fail if the weight signal is not stable as
defined by the No motion range (NR) and the No motion time (NT). If the weight signal is “stable”, the response
to the IS command (Device Status) will show the “signal stable” bit active and the SZ command will be
accepted (OK). If the “signal stable” bit is not active, the SZ command will be rejected and the DAD 141.1 will
respond with ERR (error).
10.5.2. RZ Reset Zero
[
Index 0x2061
]
This command cancels the SZ command and the zero reading reverts to that set by the CZ command during
calibration.
Master (PC / SPS) sends
Slave (DAD 141.1) responds
Meaning
RZ
OK
Zero point CZ active
The DAD 141.1 responds to the RZ command with either OK or ERR. If OK is returned
then the “zero action
performed” bit in the Device Status (IS) response will be set to “0”.
10.5.3. ZN Store Zero Value
[
Index 0x2226
]
This command allows to store the zero value non volatile @ power off of the DAD 141.1.
Permitted values are 0 (off) and 1 (on).
Master (PC / SPS) sends
Slave (DAD 141.1) responds
Meaning
ZN
Z:000
Zero @ power off: OFF
ZN_1
OK
Setup: Zero @ power off: ON
10.5.4. ST Set Tare
[
Index 0x2061
]
This command will activate the net weighing function by storing the current weight value as a tare value.
The weight signal must be “stable” within the limits set by NR (No Motion Range) and NT (No Motion Time)
commands for the “signal stable” bit to be active and set tare command to be accepted.
Master (PC / SPS) sends
Slave (DAD 141.1) responds
Meaning
ST
OK
Tare performed / Net operation
If the weight signal is “stable”, the response to the IS command (Device Status) will show the “signal stable” bit
active and the ST command will be accepted (OK). If the “signal stable” bit is not active, the ST command will
be rejected and the DAD 141.1
will respond with ERR (error).
10.5.5. RT Reset Tare
[
Index 0x2061
]
This command resets the tare and the weighing signal returns to gross mode.
Master (PC / SPS) sends
Slave (DAD 141.1) responds
Meaning
RT
OK
Tare de-activated / Gross operation
The DAD 141.1
responds to the RT command with either OK or ERR. If OK is returned then the “tare active” bit
in the Device Status (IS) response will be set to “0”.
