Manual

LDU 68.1 & 68.2 Technical Manual, Rev. 12 January 2010
Page 2 of 28
Table of Contents:
1. Safety Instructions .................................................................................................................................... 4
2. Declaration of Conformity ........................................................................................................................ 5
3. Introduction and Specifications ............................................................................................................... 6
4. Communications and Getting started ..................................................................................................... 7
4.1. Serial Interface ......................................................................................................................................... 7
4.2. Command Language ................................................................................................................................ 7
4.3. Baud Rate / Device Address .................................................................................................................... 8
4.4. Getting Started ......................................................................................................................................... 8
5. Hardware and Wiring ................................................................................................................................. 9
5.1. Wiring ....................................................................................................................................................... 9
5.2. With Unit Adapter UA 77.1 (RS232) ........................................................................................................ 9
5.3. With Unit Adapter UA 73.2 (RS422 / RS485 Full-/Half-Duplex) .............................................................. 9
5.4. Terminal Configuration ........................................................................................................................... 10
5.5. Load Cell Connection ............................................................................................................................. 10
6. Calibration and Calibration Sequence ................................................................................................... 11
7. Commands – Overview ........................................................................................................................... 12
8. Commands Description .......................................................................................................................... 13
8.1. System Diagnosis Commands – ID, IV, IS, SR, RS .............................................................................. 13
8.1.1. ID Get Device Identity ................................................................................................................................... 13
8.1.2. IV Get Firmware Version ............................................................................................................................... 13
8.1.3. IS Get Device Status ..................................................................................................................................... 13
8.1.4. SR Reset LDU XX.X Firmware ...................................................................................................................... 13
8.1.5. RS Read Serial Number ................................................................................................................................ 13
8.2. Calibration Commands – CE, CM, DS, DP, CZ, CG, ZT, ZI, FD, CS .................................................... 14
8.2.1. CE Read TAC* Counter / Open Calibration Sequence ................................................................................. 14
8.2.2. CM Set Maximum Output Value ..................................................................................................................... 14
8.2.3. DS Set Display Step Size .............................................................................................................................. 14
8.2.4. DP Set Decimal Point Position ...................................................................................................................... 14
8.2.5. CZ Set Calibration Zero Point ....................................................................................................................... 14
8.2.6. CG Set Calibration Gain (Span) ..................................................................................................................... 15
8.2.7. ZT Enable / Disable Zero Tracking ................................................................................................................ 15
8.2.8. ZI Initial Zero Range ...................................................................................................................................... 15
8.2.9. FD Reset to Factory Default Settings ............................................................................................................ 15
8.2.10. CS Save the Calibration Data ....................................................................................................................... 15
8.3. Motion Detection Commands – NR, NT ................................................................................................. 16
8.3.1. NR Set No-motion Range ............................................................................................................................... 16
8.3.2. NT Set No-motion Time Period ..................................................................................................................... 16
8.4. Filter Setting Commands – FL, FF, UR .................................................................................................. 17
8.4.1. FL Filter Settings ........................................................................................................................................... 17
8.4.2. FF Moving Average ....................................................................................................................................... 17
8.4.3. UR Update Rate ............................................................................................................................................. 17
8.5. Taring and Zeroing Commands – SZ, RZ, ST, RT ................................................................................ 18
8.5.1. SZ Set Zero ................................................................................................................................................... 18
8.5.2. RZ Reset Zero Point...................................................................................................................................... 18
8.5.3. ST Set Tare ................................................................................................................................................... 18
8.5.4. RT Reset Tare ............................................................................................................................................... 18
8.6. Output Commands – GG, GN, GT, GS, GF, GW, GA ........................................................................... 19
8.6.1. GG Get Gross Value ...................................................................................................................................... 19
8.6.2. GN Get Net Value .......................................................................................................................................... 19
8.6.3. GT Get Tare Value ........................................................................................................................................ 19
8.6.4. GS Get ADC Sample Value ........................................................................................................................... 19
8.6.5. GF Get Filtered Value ................................................................................................................................... 19
8.6.6. GW Get Data String “Net, Gross and Status“ ................................................................................................. 19
8.6.7. GA Get Triggered Average Value .................................................................................................................. 19