LDU 179.1 Technical Manual rev. 1.10 - February 2019 Page 24 of 45
8.1.5. RS Read Serial Number
[ SDO 2900 sub 0C ]
Issuing the RS command will return the current serial number in the format S+12345678.
Master (PC / SPS) sends
Slave (LDU179.1) responds
Meaning
RS
S+00138547
Request: SN = 138547
8.2. Calibration Commands
– CE, CM n, CI, MR, DS, DP, CZ, CG, ZT, FD,
IZ, ZR, ZI, TM, TN, ZN, AZ, AG, CS
8.2.1. CE Read TAC* Counter / Open Calibration Sequence
[ SDO 2300 sub 03 ]
With this command you can read the TAC counter (*TAC = Traceable Access Code) or you can open a
calibration sequence.
Master (PC / SPS) sends
Slave (LDU 179.1) responds
Meaning
CE
E+00017 (example)
TAC counter = 17
CE17
OK
Calibration sequence active
This command must be issued PRIOR to any attempt to set the parameters in the calibration group of
commands. In legal for trade applications the TAC counter can be used to check if critical parameters have
been change without re-verification. After each calibration save (CS) the TAC counter increases by 1.
8.2.2. CM n Set Maximum Output Value
[ CM / CM1: SDO 2300 sub 07 ] [ CM2: SDO 2300 sub 0E ] [ CM3: SDO 2300 sub 0F ]
This command (CM n with n = 1, 2 or 3) is used to set up the maximum output value (respective the switching
point in multi range applications). Permitted values are from 0 to 999999.
Master (PC / SPS) sends
Slave (LDU 179.1) responds
Meaning
CM1
M+030000
Request: CM1 = 30000 d
CE
E+00017 (example)
Request: TAC counter CE17
CE17
OK
Calibration sequence active
CM1_50000
OK
Setup: CM1 = 50000 d
This value will
determine the point at which the output will change to “ooooooo”, signifying over-range
respective the point at which the output will change the measuring range / interval size.
Application
CM 1 = MAX 1
CM 2 = MAX 2
CM 3 = MAX 3
Single range
CM 1 = 1...999999
CM 2 = 0
(means CM 2 not used)
CM 3 = 0
(means CM 3 not used)
Dual range or dual interval
(
Command
MR
)
CM 1 = 1...MAX 1
CM 2 = MAX 1...999999
Triple range or triple interval
(
Command
MR
)
CM 1 = 1...MAX 1
CM 2 = MAX 1...MAX 2
CM 3 = MAX 2...999999
It is necessary: 1
MAX 1 < MAX 2 < MAX 3
999999
Note:
The range, in which a scale can be set to zero (SZ) or automatic zero tracking (ZT) is active, is +/- 2% of
CM value. Factory default: CM1 = 999999, CM 2 = 0, CM 3 = 0
8.2.3. CI
Set Minimum Output Value
[ SDO 2300 sub 08 ]
This command is used to set up the minimum output value. Permitted values are from
– 999999 to 0.
Master (PC / SPS) sends
Slave (LDU 179.1) responds
Meaning
CI
I
–
000009
Request: CI =
–9 d
CE
E+000017 (example)
Request: TAC counter CE17
CE17
OK
Calibration sequence active
CI
-
10000
OK
Setup: CI = -10000 d
This value will determine the point at which the output will change to “uuuuuuu”, signifying under-range.
