Manual

LDU 78.1 Technical Manual, Rev. 12 May 2011
Page 22 of 36
8.6. Output Commands – GG, GN, GT, GS, GW, GA, GL, OF
The following commands “Get” the gross, net, tare and ADC sample values from the LDU 78.1.
8.6.1. GG Get Gross Value
Master (PC / SPS) sends Slave (LDU XX.X) responds Meaning
GG G+01.100
Gross value: 1.100 d
8.6.2. GN Get Net Value
Master (PC / SPS) sends Slave (LDU XX.X) responds Meaning
GN N+01.000
Net value: 1.000 d
8.6.3. GT Get Tare Value
Master (PC / SPS) sends Slave (LDU XX.X) responds Meaning
GT T+00.100
Tare value: 0,100 d
8.6.4. GS Get ADC Sample Value
This command gets the actual Analogue to Digital Converter (ADC) value. This can be useful during
development or when calibrating to see how much of the ADC range is being used.
Master (PC / SPS) sends Slave (LDU XX.X) responds Meaning
GS S+125785
ADC sample value = 125785 d
For service purposes it may be helpful to note the GS values for the “no-load” or “zero” output and when the
“calibration load” is applied.
8.6.5. GW Get Data String “Net, Gross and Status“
Master (PC / SPS) sends Slave (LDU XX.X) responds Meaning
GW
W+000100+0011005109
(example)
Net value: +000100 d (no decimal point)
Gross value: +001100 d (no decimal point)
Status bit 1: 5 (not used)
Status bit 2: 1 (Hex)
Check sum: 09 (Hex)
The status bits 1 and 2 are defined as follows:
Status
Value = 1 Value = 2 Value = 4 Value = 8
Status bit 1 Not used Not used Output 0 active Output 1 active
Status bit 2 Signal stable Set zero performed Tare active Not used
The check sum is the reciprocal value of the sum of all ASCII values within the data string without the check
sum itself.
8.6.6. GA Get Triggered Average Value
This command reads the measurement result of a measurement cycle. The measurement value has been
averaged according the defined measuring time. The trigger commands can be found in chapter 8.12 and 8.13.
Master (PC / SPS) sends Slave (LDU XX.X) responds Meaning
GA A+01.100
Request: GA = 1100 g
Note: For preventing errors during the read out of the data the register GA has stored the value 99999 at the
beginning of the measurement cycle. The measurement result can only be read after the defined measuring
time MT has been elapsed and before a new measurement cycle has been started.