Load C Cell Digittizing Un nit T e LDU Type U 68 8.1 & 68 8.2 TECHN NICAL MANUA AL Firm mware Verssion 68.18 81.v.4.00 or higher Hardware e Version 6 68.101.5.v.3.00 & 68.201.5 v.3..00 Documen nt No. G11 19 Rev12 GB G Flintec Gm mbH Bemannsb bruch 9 74909 Meckesheim GERMANY Y www.flinte ec.
Table of Contents: 1. Safety Instructions .................................................................................................................................... 4 2. Declaration of Conformity ........................................................................................................................ 5 3. Introduction and Specifications ............................................................................................................... 6 4.
8.7. Auto–transmit Commands – SG, SN, SF, SW, SA ................................................................................20 8.7.1. 8.7.2. 8.7.3. 8.7.4. 8.7.5. 8.8. SG Send Gross Value continuously ............................................................................................................... 20 SN Send Net Value continuously ..................................................................................................................
RIGHTS A AND LIABIL LITIES All rights reeserved. No part of tthis publication may be re eproduced, sstored in a re etrieval syste em, or transm mitted in any form or by any a means, me echanical, ph hotocopying, recording, o or otherwise, without the prior p written ppermission of o Flintec GmbH No patent liability is asssumed with respect r to the e use of the information contained c heerein.
2. D Declarattion of Conform C mity 0 EG-K Konform mitätserk klärung EC-D Declarattion of Conform C mity Mona at/Jahr: month//year: 07//2010 Herste eller: Manufactturer: Flin ntec GmbH Ansch hrift: Address:: Bemannsbruch 9 74909 Meckesh heim D-7 Deu utschland / Germany Produ uktbezeichnung g: Product nam me: LDU 68.1 / LDU 68.
3. Introduction and Specifications The model LDU 68.x is a precise digital amplifier for weighing and force measurements with strain gauge (SG) sensors. The LDU 68.2 can be used for industrial applications,the LDU 68.1 can be used in legal for trade as well as for industrial applications. The device features full multi-drop communications capability and can be programmed via a straightforward ASCII command set. The LDU XX.X series and the amplifier DAS 72.
4. Communications and Getting started 4.1. Serial Interface Communicating with the LDU 68.1 digitizer is carried out via the RS422/RS485 port. The data format is the familiar 8/N/1 structure (8 data bits, no parity, 1 stop bit). Available baud rates via the RS422/RS485 port are as follows: 9 600, 19 200, 38 400, 57 600 or 115 200 baud. RS422: Connection using a 4 wire technique Point-to-Point connection, i.e.
4.3. Baud Rate / Device Address Baud Rate: For baud rate setup use command BR, see chapter 8.10 Factory default: 9 600 baud Device Address: For address setup use command AD, see chapter 8.10 Factory default: Address 0 Setting the device address to 0 will set the continuously active mode, where the device becomes permanently active, and will listen and respond to any command on the bus, without the need for an OP xxx command. Note: The LDU XX.
5. H Hardwarre and Wiring W 5.1. W Wiring 5.2. W With Unit Adapterr UA 77.1 1 (RS232 2) 5.3. W With Unit Adapterr UA 73.2 2 (RS422 2 / RS485 5 Full-/Ha alf-Duple ex) LDU 68..1 & 68.2 Tech hnical Manual, Rev.
5.4. Terminal Configuration LDU 68 8.x Pin no o. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 UA A 73.2 Gnd (Sh hield) +Exc + Sens + Sig – Sig – Sen – Exc Gnd NC NC + Rx - Rx - Tx + Tx 0 In 0 out 1 In 1 Out + PWR Gnd UA 77..
6. Calibration and Calibration Sequence The calibration of LDU 68.x is only possible after starting a calibration sequence (compare with chapter 8.2). Command CE: Command CM: Command CI: Command DS: Command DP: Command CZ: Command CG: Command ZT: Command FD : Command CS : Calibration enable – returns the current TAC value Calibrate maximum display – sets the max.
7.
8. Commands Description For better clarity, all commands are divided into groups as described on the following pages. 8.1. System Diagnosis Commands – ID, IV, IS, SR, RS Use these commands you get the LDU XX.X type, firmware version or device status. These commands are sent without parameters. 8.1.1. ID Get Device Identity Master (PC / SPS) sends ID Slave (LDU XX.X) responds D:6813 The response to this request gives the actual identity of the active device.
8.2. Calibration Commands – CE, CM, DS, DP, CZ, CG, ZT, ZI, FD, CS 8.2.1. CE Read TAC* Counter / Open Calibration Sequence With this command you can read the TAC counter (*TAC = Traceable Access Code) or you can open a calibration sequence. Master (PC / SPS) sends CE CE 17 Slave (LDU XX.
8.2.6. CG Set Calibration Gain (Span) This is the reference point for calibration under load, and is subject to TAC control. Permitted values are from 1 to 99 999. Master (PC / SPS) sends CG CE CE 17 CG 15000 Slave (LDU XX.
8.3. Motion Detection Commands – NR, NT The motion detection facility provides a means of disabling certain functions whenever a condition of instability, or “motion”, is detected. The “no-motion”, or “stable” condition is achieved whenever the signal is steady for the period of time set by NT, during which it cannot fluctuate by more than NR increments.The stable condition activates the relevant bit of responses to “Info Status” (IS).
8.4. Filter Setting Commands – FL, FF, UR A digital filter can be set which will eliminate most of the unwanted disturbances. The commands FL and FF are used to define the digital filter settings, the command UR is used to define an averaging of up to 90 measurement values. Please note that these filters are positioned immediately after the A/D Converter and therefore affect all aspects of the weighing operation. 8.4.1.
8.5. Taring and Zeroing Commands – SZ, RZ, ST, RT 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.
8.6. Output Commands – GG, GN, GT, GS, GF, GW, GA The following commands “Get” the gross, net, tare and ADC sample values from the LDU 68.1. 8.6.1. GG Get Gross Value Master (PC / SPS) sends GG 8.6.2. GN Meaning Gross value: 1.100 d Get Net Value Master (PC / SPS) sends GN 8.6.3. GT Slave (LDU XX.X) responds N+01.000 Meaning Net value: 1.000 d Get Tare Value Master (PC / SPS) sends GT 8.6.4. GS Slave (LDU XX.X) responds G+01.100 Slave (LDU XX.X) responds T+00.
8.7. Auto–transmit Commands – SG, SN, SF, SW, SA The following commands allow the gross weight or net weight values to be continuously sent. Continuous transmission start as soon as the relevant command has been issued and finishes when any other valid command is accepted by the LDU 68.1. The data output rate will depend on the baud rate being used e.g. with a baud rate of 9 600, approximately 100 values per second can be transmitted. Note: The SG, SN and SW commands will only work if the LDU 68.
8.8. Commands for External I/O Control – IN, IO, IM The LDU 68.1 has 2 independent logic inputs and 2 independent logic outputs. These inputs and outputs can be configured and controlled completely via the LDU. The logic inputs can be read directly by the host application and the logic outputs can be fully controlled via the setpoint commands.
8.9. Setpoint Output Commands – Sn, Hn, An The LDU 68.1 has 2 logic outputs where the status depends on the weight value (setpoint). Each logic output can be assigned an independent setpoint value (Sn) with a corresponding hysteresis/switch action (Hn) and allocation (An – switch on the gross or the net weight). 8.9.1. S0 / S1 Setpoint Value Master (PC / SPS) sends S0 S0 03000 S1 S1 03000 8.9.2. H0 / H1 Slave (LDU XX.
8.10. Communication Setup Commands – AD, BR, CL, DX, TD, OP 8.10.1. AD Device Address This command can set up the device address in the value range from 0 to 255. Master (PC / SPS) sends AD AD 49 Slave (LDU XX.X) responds A:000 OK Meaning Request: Address 0 (Factory default) Setup: Address 49 Setting the device address to “0“ will cause the device to be permanently active, listening and responding to every command on the bus without the need for an OP command.
8.11. Save Calibration and Setup Data Commands – CS, WP, SS, GI, PI The calibration and setup parameters can be divided in 3 groups: Calibration: CMn, CI, MR, DS, DP, CZ, CG, ZT, ZR, FD, LC and LNn, saved by command CS Setup: FL, FM, NR, NT, BR, AD, DX and other, saved by command WP Setpoints: S0, S1, H0, H1, A0, A1, saved by command SS Note: Calibration data can only be saved if the TAC code is known and precedes the CS command. See the CE and CS commands in chapter 8.2.
8.12. Trigger Commands – SD, MT, GA, TE, TR, TL, SA Note: All changes to the trigger commands have to be stored in the EEPROM using the WP command. See chapter 8.11 8.12.1. SD Start Delay Time This command defines a time delay between the trigger and the start of the measurement. Setting range: 0 ms to 500 ms. Master (PC / SPS) sends SD SD 200 Slave (LDU XX.
8.12.6. TL L Trigger Level L This comm mand defines a level for a rising edge trigger on the measurem ment signal. S Setting range e: 0 to 99999 9. Master (PC / SPS) sends s TL TL 1000 Slave (LDU XX.X) respo onds T+ +99999 OK Meaning Requeest: TL = 999 999 Setuup: TL = 1000 In the exam mple a new measuremen m t cycle would d automatica ally start, if th he signal excceeds 1000 d (e.g. 100,0 g; trigger com mmands SD and a TL).
9. Use in “Approved” Applications (LDU 68.1 only) The term “approved” applies whenever the weighing application is intended to be used for “legal-for-trade” weighing – that is, money will change hands according to the weight result. Such applications are bound by the legal metrology regulations of the relevant governments around the World, but most countries will comply with either the relevant EN’s (Euro Norms) or the relevant OIML (Organisation Internationale de Metrologie Legale) recommendations.
10. Updates – Firmware Download For a software update the LDU xx.x amplifier has to be connected with a Windows PC via the serial interface (4-wire connection; RS485/RS422 respective RS485/RS232 converter). The solder pads SW4 on the bottom side of the PCB must be closed before switching on. After the download the solder pads must be opened again. A download is accomplished with help of our program “PROG78”. Firmware update for LDU xx.x series: First all necessary files (LduDownload.exe, progXX.
