H&B LDU 179.1 User manual

LDU 179.1 Technical Manual rev. 1.10 - February 2019 Page 1 of 45
Load Cell Digitizing Unit
Type LDU 179.1
TECHNICAL MANUAL
Firmware Version 179.181.v.1.10 or higher
Hardware Version 179.101.5.v.1.01
Document No. X179 Rev 1.1 EN
Hauch & Bach ApS
Femstykket 6
DK-3540 Lynge
Denmark
www.haubac.com

LDU 179.1 Technical Manual rev. 1.10 - February 2019 Page 2 of 45
Table of Contents:
1. Safety Instructions ....................................................................................................................................5
2. Declaration of Conformity.........................................................................................................................6
3. Introduction and Specifications...............................................................................................................7
4. Communications and Getting started .....................................................................................................8
4.1. Serial Interface............................................................................................................................................8
4.2. Command Language ....................................................................................................................................8
4.3. Baud Rate...................................................................................................................................................8
4.4. Getting Started............................................................................................................................................8
5. Hardware and Wiring.................................................................................................................................9
5.1. Wiring .......................................................................................................................................................9
5.2. With Unit Adapter UA 73.2 ..........................................................................................................................9
5.3. Terminal Configuration.................................................................................................................................9
5.4. Load Cell Connection ................................................................................................................................. 10
5.5. Serial Port Connection................................................................................................................................ 10
5.6. CAN Connection ........................................................................................................................................ 10
5.7. Function of the solder pads ........................................................................................................................ 10
6CANopen interface ..................................................................................................................................11
6.1 General .................................................................................................................................................... 11
6.2 The PDOs ................................................................................................................................................. 12
6.3 The SDOs ................................................................................................................................................. 13
6.4 Communication Profile ............................................................................................................................... 14
6.5 Object Directory ........................................................................................................................................ 14
7. Commands –Overview...........................................................................................................................21
8. Commands Description ..........................................................................................................................23
8.1. System Diagnosis Commands –ID, IV, IS, SR, RS ........................................................................................ 23
8.1.1. ID Get Device Identity ....................................................................................................................................23
8.1.2. IV Get Firmware Version................................................................................................................................23
8.1.3. IS Get Device Status......................................................................................................................................23
8.1.4. SR Software Reset.........................................................................................................................................23
8.1.5. RS Read Serial Number.................................................................................................................................24
8.2. Calibration Commands –CE, CM n, CI, MR, DS, DP, CZ, CG, ZT, FD, IZ, ZR, ZI, TM, TN, ZN, AZ, AG, CS........... 24
8.2.1. CE Read TAC* Counter / Open Calibration Sequence...................................................................................24
8.2.2. CM n Set Maximum Output Value................................................................................................................24
8.2.3. CI Set Minimum Output Value........................................................................................................................24
8.2.4. MR Set Multi-range / Multi-interval.................................................................................................................25
8.2.5. DS Set Display Step Size...............................................................................................................................25
8.2.6. DP Set Decimal Point Position.......................................................................................................................25
8.2.7. CZ Set Calibration Zero Point ........................................................................................................................25
8.2.8. CG Set Calibration Gain (Span).....................................................................................................................26
8.2.9. ZT Enable / Disable Zero Tracking.................................................................................................................26
8.2.10. FD Reset to Factory Default Settings.............................................................................................................26
8.2.11. IZ Correction of System Zero......................................................................................................................26
8.2.12. ZR Zero Range ..............................................................................................................................................27
8.2.13. ZI Initial Zero Range.......................................................................................................................................27
8.2.14. TM Tare mode.............................................................................................................................................27

LDU 179.1 Technical Manual rev. 1.10 - February 2019 Page 3 of 45
8.2.15. TN Set / Clear Non-Volatile Tare....................................................................................................................27
8.2.16. ZN Set / Clear Non-Volatile Zero....................................................................................................................28
8.2.17. AZ Absolute zero point calibration (eCal).......................................................................................................28
8.2.18. AG Absolute gain calibration (eCal) ...............................................................................................................28
8.2.19. CS Save the Calibration Data ........................................................................................................................28
8.3. Motion Detection Commands –NR, NT ........................................................................................................ 29
8.3.1. NR Set No-motion Range...............................................................................................................................29
8.3.2. NT Set No-motion Time..................................................................................................................................29
8.4. Filter Setting Commands –FM, FL, UR......................................................................................................... 29
8.4.1. FM Filter Mode...............................................................................................................................................29
8.4.2. FL Filter setting ..............................................................................................................................................30
8.4.3. UR Update Rate and Averaging.....................................................................................................................31
8.5. Taring and Zeroing Commands –SZ, ZA, RZ, ST, RT, SP............................................................................... 31
8.5.1. SZ Set System Zero.......................................................................................................................................31
8.5.2. ZA Set Averaged System Zero.......................................................................................................................31
8.5.3. RZ Reset Zero................................................................................................................................................31
8.5.4. ST Set Tare....................................................................................................................................................32
8.5.5. RT Reset Tare................................................................................................................................................32
8.5.6. SP Set Preset Tare ........................................................................................................................................32
8.6. Output Commands –GG, GN, GT, GS, GW, GA, GL, OF................................................................................. 32
8.6.1. GG Get Gross Value......................................................................................................................................32
8.6.2. GN Get Net Value ..........................................................................................................................................32
8.6.3. GT Get Tare Value.........................................................................................................................................32
8.6.4. GS Get ADC Sample Value ...........................................................................................................................33
8.6.5. GW Get Data String “Net, Gross and Status“.................................................................................................33
8.6.6. GA Get Triggered Average Value...................................................................................................................33
8.6.7. GL Get Data String “Average, Gross and Status“ ..........................................................................................33
8.6.8. OF Output Format for Data String GW and GL ..............................................................................................33
8.7. Auto–transmit Commands –SG, SN, SX, SA, SL ........................................................................................... 34
8.7.1. SG Send Gross Value continuously...............................................................................................................34
8.7.2. SN Send Net Value continuously ...................................................................................................................34
8.7.3. SX Send ADC Sample Value continuously ....................................................................................................34
8.7.4. SA Send Triggered Average Value automatically ..........................................................................................34
8.7.5. SL Send Data String “Average, Gross and Status“ automatically ..................................................................34
8.8. Commands for External I/O Control –IN, IO and OM.................................................................................... 35
8.8.1. IN Read status of the logic inputs...................................................................................................................35
8.8.2. IO Read / modify the status of the logic outputs.............................................................................................35
8.8.3. OM Control of the logic outputs by the host application .................................................................................35
8.9. Setpoint Output Commands –S’n’, H’n’, A’n’, HT .......................................................................................... 36
8.9.1. S‘n’ Setpoint Value.........................................................................................................................................36
8.9.2. H’n’ Hysteresis and Switching Action for a Setpoint.......................................................................................36
8.9.3. A’n’ Allocation source for a Setpoint...............................................................................................................36
8.9.4. HT Hold time for all Setpoints.........................................................................................................................37
8.10. Communication Setup Commands –AD, NA, NS, BR, DX............................................................................... 38
8.10.1. AD Device Address –Serial channel..............................................................................................................38
8.10.2. NA Network Address - CAN...........................................................................................................................38
8.10.3. NS Network Settings –For Serial Channel and CAN Interface...................................................................38
8.10.4. BR Baud Rate –Serial channel......................................................................................................................39
8.10.5. DX Full Duplex –Serial channel.....................................................................................................................39
8.11. Save Calibration and Setup Data Commands –CS, WP, SS, GI, PI.................................................................. 40
8.11.1. CS Save the Calibration Data ........................................................................................................................40
8.11.2. WP Save the Setup Parameters ....................................................................................................................40
8.11.3. SS Save Setpoint Parameters........................................................................................................................40
8.11.4. GI Get an Image File from the EEPROM .......................................................................................................40
8.11.5. PI Download an Image File to the EEPROM..................................................................................................40
8.12. Trigger Commands –SD, MT, GA, TE, TR, TL, SA......................................................................................... 41
8.12.1. SD Start Delay Time.......................................................................................................................................41
8.12.2. MT Measuring Time .......................................................................................................................................41
8.12.3. GA Get Triggered Average Value...................................................................................................................41
8.12.4. TE Trigger Edge.............................................................................................................................................41
8.12.5. TR Software Trigger.......................................................................................................................................42
8.12.6. TL Trigger Level.............................................................................................................................................42
8.12.7. SA Send Triggered Average Value automatically ..........................................................................................42

LDU 179.1 Technical Manual rev. 1.10 - February 2019 Page 4 of 45
8.13. Re-Trigger Commands –RW, TT, TS, DT, TW and TI ................................................................................... 43
8.13.1. RW Trigger Window for Re-Trigger Function.................................................................................................43
8.13.2. TT Averaging Time for Re-trigger Function.................................................................................................43
8.13.3. TS Stop Value for Re-trigger Function ........................................................................................................43
8.13.4. DT Short-time Averaging Period..................................................................................................................43
8.13.5. TW Window for Automatic Taring...................................................................................................................44
8.13.6. TI Averaging Time for Automatic Taring.........................................................................................................44
9. Use in “Approved” Applications............................................................................................................45

LDU 179.1 Technical Manual rev. 1.10 - February 2019 Page 5 of 45
RIGHTS AND LIABILITIES
All rights reserved.
No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any
means, mechanical, photocopying, recording, or otherwise, without the prior written permission of Hauch &
Bach ApS.
No patent liability is assumed with respect to the use of the information contained herein. While every
precaution has been taken in the preparation of this book, Hauch & Bach assumes no responsibility for errors
or omissions. Neither is any liability assumed for damages resulting from the use of the information contained
herein.
The information herein is believed to be both accurate and reliable. Hauch & Bach, however, would be obliged
to be informed if any errors occur. Hauch & Bach cannot accept any liability for direct or indirect damages
resulting from the use of this manual.
Hauch & Bach reserves the right to revise this manual and alter its content without notification at any time.
Neither Hauch & Bach nor its affiliates shall be liable to the purchaser of this product or third parties for
damages, losses, costs, or expenses incurred by purchaser or third parties as a result of: accident, misuse, or
abuse of this product or unauthorized modifications, repairs, or alterations to this product, or failure to strictly
comply with Hauch & Bach operating and maintenance instructions.
Hauch & Bach shall not be liable against any damages or problems arising from the use of any options or any
consumable products other than those designated as Original Hauch & Bach Products.
NOTICE: The contents of this manual are subject to change without notice.
Copyright © 2012-2013 by Hauch & Bach ApS, DK-3540 Lynge, Femstykket 6, Denmark
1. Safety Instructions
CAUTION READ this manual BEFORE operating or servicing this equipment. FOLLOW these
instructions carefully. SAVE this manual for future reference. DO NOT allow untrained personnel to
operate, clean, inspect, maintain, service, or tamper with this equipment. ALWAYS DISCONNECT
this equipment from the power source before cleaning or performing maintenance.
CALL Hauch & Bach ApS for parts, information, and service.
WARNING ONLY PERMIT QUALIFIED PERSONNEL TO SERVICE THIS EQUIPMENT.
EXERCISE CARE WHEN MAKING CHECKS, TESTS AND ADJUSTMENTS THAT MUST BE
MADE WITH POWER ON. FAILING TO OBSERVE THESE PRECAUTIONS CAN RESULT IN
BODILY HARM.
WARNING FOR CONTINUED PROTECTION AGAINST SHOCK HAZARD CONNECT TO
PROPERLY GROUNDED OUTLET ONLY. DO NOT REMOVE THE GROUND PRONG.
WARNING DISCONNECT ALL POWER TO THIS UNIT BEFORE REMOVING THE FUSE OR
SERVICING.
WARNING BEFORE CONNECTING/DISCONNECTING ANY INTERNAL ELECTRONIC
COMPONENTS OR INTERCONNECTING WIRING BETWEEN ELECTRONIC EQUIPMENT
ALWAYS REMOVE POWER AND WAIT AT LEAST THIRTY (30) SECONDS BEFORE ANY
CONNECTIONS OR DISCONNECTIONS ARE MADE. FAILURE TO OBSERVE THESE
PRECAUTIONS COULD RESULT IN DAMAGE TO OR DESTRUCTION OF THE EQUIPMENT OR
BODILY HARM.
CAUTION OBSERVE PRECAUTIONS FOR HANDLING ELECTROSTATIC SENSITIVE
DEVICES.

LDU 179.1 Technical Manual rev. 1.10 - February 2019 Page 6 of 45
2. Declaration of Conformity
EG-Konformitätserklärung
EC-Declaration of Conformity
Monat/Jahr: month/year:
02/2019
Hersteller: Manufacturer:
Hauch & Bach ApS
Anschrift: Address:
Femstykket 6
DK-3540 Lynge
Dänemark/ Denmark
Produktbezeichnung:Product name:
LDU 179.1
Das bezeichnete Produkt stimmt mit folgenden Vorschriften der Europäischen Richtlinien überein:
This product confirms with the following regulations of the Directives of the European Community
Richtlinie 2014/30/EUdes Europäischen
Parlaments und des Rates vom 26. Februar 2014
zur Angleichung der Rechtsvorschriften der Mitglied-
staaten über die elektromagnetische Verträglichkeit
und zur Aufhebung der Richtlinie 2004/108/EC.
Directive2014/30/EUoftheEuropeanParliamentandofthe
Councilof26thFebruary2014ontheapproximationofthelawsof
theMemberStatesrelatingtoelectromagneticcompatibilityand
repealing Directive2004/108/EC.
DieseErklärungbescheinigtdieÜbereinstimmung mit
dengenanntenRichtlinien,beinhaltetjedochkeine
ZusicherungvonEigenschaften.
Thisdeclarationcertifies theconformitywiththelisteddirectives,
butitisnopromiseofcharacteristics.
Richtlinie 2014/35/EU Niederspannungs-Richtlinie
Directive 2014/35/EULowVoltage Directive
FolgendeNormenwerdenzumNachweisderÜbereinstimmungmitdenRichtlinieneingehalten:
Asaproofofconformitywiththedirectivesfollowingstandardsarefulfilled:
OIMLR-76-1
Nicht-SelbsttätigWaagen–MetrologischeundtechnischeAnforderungen (OIMLR-76:2006Teil1)
Non-automaticweighingsystems–Metrologicalandtechnicalrequirements(OIML R-76:2006Part1)
DINEN
45501
MetrologischeAspektenichtselbsttätigerWaagen;DeutscheFassung EN45501:2015
AnhangB.3:FunktionsprüfungenunterStöreinflüssen
AnhangC:VerfahrenfürdiePrüfungderStörfestigkeitgegenhochfrequenteelektromagnetischeFelder.
Michael Bach
ManagingDirector

LDU 179.1 Technical Manual rev. 1.10 - February 2019 Page 7 of 45
3. Introduction and Specifications
The model LDU 179.1 is a very precise high-speed digital amplifier for weighing and force measurements with
strain gauge (SG) sensors. The LDU 179.1 can be used in legal for trade as well as for industrial applications.
The device features a CAN interface with support for the CANopen protocol as well as a full duplex RS232
interface using a straightforward ASCII command set. The LDU 179.1 and the well known LDU 78.1, both use
nearly the same command set. The LDU 179.1 with its accurate A to D converter and a sample rate of up to 1200
measurement values per second, is particularly suitable for static or dynamic measurements and control
purposes.
Specifications
Accuracy class
III or IIII
Test certificate according OIML R76
10 000 intervals or n x 10 000 intervals
(n = 1, 2, 3)
Maximum number of verification scale intervals (n)
10 000
Minimum input voltage per VSI
µV
0.2
Measuring range (FS)
mV/V
±3.3
Maximum resolution at FS (approx.)
incr.
±880000
Measuring rate
Hz
9.4 to 1200
Digital filter cut-off frequency (-3dB)
Hz
0.25 to 18
Bridge excitation voltage
VDC
5
Maximum bridge excitation current
mA
115
Load cell cable length (for n = 10 000)
m/mm2
726
Maximum resistance per wire (for n = 10 000)
Ω
12.3
Linearity error (relative to full scale)
%
±0.0005
Temperature effect on zero (relative to full scale)
%/10 K
±0.0003 (Typical)
Temperature effect on span
%/10 K
±0.001 (Typical)
Interface 1
CAN
Bit rate
kbits/s
10 to 1000
Protocol
CAN Open
Interface 2
RS-232
Baud rate
bits/s
9600 to 460800
Frame format
8 data bits, 1 stop bit, no parity bits
Protocol
Readable ASCII
Logical inputs
2
Maximum input voltage
VDC
30
Threshold voltage (approx.)
VDC
6
Input resistance (approx.)
kΩ
8
Logical outputs
2
Maximum voltage
VDC
30
Maximum current
A
0.5
Supply voltage
VDC
10 to 30
Power consumption (without load cells)
mW
<250
Operating temperature range
°C
-15 to +55
Storage temperature range
°C
-30 to +70
Dimensions (LxWxH) excluding pins
mm
81.3 x 30.7 x 6.5
Weight
g
28
Protection
IP20

LDU 179.1 Technical Manual rev. 1.10 - February 2019 Page 8 of 45
4. Communications and Getting started
4.1. Serial Interface
Communicating with the LDU 179.1 digitizer is carried out via serial RS 232 port.
The data format is the familiar 8/N/1 structure (8 data bits, no parity, 1 stop bit).
Available baud rates via the RS232 port are as follows: 9600, 19200, 38400, 57600, 115200, 230400 and
460800 baud.
Factory default: 115200 baud
4.2. Command Language
The command set of the LDU 179.1 is based on a simple ASCII format (2 letters). This enables the user to
setup the device, get results or check parameters.
Example: LDU 179.1 is connected via the RS232 port to a PC / PLC system. You want to get the identity,
firmware version or net weight.
Remark: In this manual means: Space “_“ and Enter (CR/LF) ““
Master (PC / SPS) sends
Slave (LDU 179.1) responds
Meaning
ID
D:1790
Identity of the device
IV
V:0107
Firmware version of the device
GN
N+1234.56
Net weight with algebraic sign/floating point
4.3. Baud Rate
For baud rate setup use command BR, see chapter 8.10.4
Factory default: 115200 baud
4.4. Getting Started
You will require:
PC or PLC with a RS232 communication port
A load cell / scale with test weights or a load cell simulator
A 12-24 VDC power supply capable of delivering approximately 100mA
One or more LDU 179.1
A suitable ASCII communication software **
Refer to the following wiring diagram in chapter 5.
**
You can easily communicate between a PC and a LDU 179.1 using programs such as Procomm, Telemate,
Kermit, HyperTerminal or HTerm etc.
Additional the powerful software DOP 4 with graphical user interface and oscilloscope function for the operating
systems Windows XP / Vista / 7 / 8 / 10 is available.

LDU 179.1 Technical Manual rev. 1.10 - February 2019 Page 9 of 45
5. Hardware and Wiring
5.1. Wiring
Colour code of standard Flintec load cells Pins of the LDU 179.1
5.2. With Unit Adapter UA 73.2
Note: The power, supplied to the LDU179.1, must be limited to 15VA with a suitable current limit device,
e.g. a fuse".
5.3. Terminal Configuration
LDU 179.1
Load cell
Pin no.
0
Shield
1
+ Excitation
2
+ Sense
3
+ Signal
4
–Signal
5
–Sense
6
–Excitation
7
Shield
8
NC
9
NC
LDU 179.1
Pin
Function
Pin no.
10
TxD
RS232 TxD
11
RxD
RS232 RxD
12
CANL
CAN line low
13
CANH
CAN line high
14
In 0
Logical input 0
15
Out 0
Logical output 0
16
In 1
Logical input 1
17
Out 1
Logical output 1
18
+ Pwr
Power supply +10..+30 VDC
19
Gnd
Power supply -
Serial Port: Terminal 10, 11,
and 19 (Gnd).
CAN Port: Terminal 12, 13,
and 19 (Gnd).
In/Out 0: Terminal 14, 15
In/Out 1: Terminal 16, 17
Power supply 12...30 VDC
Terminal 18: +Pwr
Terminal 19: Gnd

LDU 179.1 Technical Manual rev. 1.10 - February 2019 Page 10 of 45
5.4. Load Cell Connection
The load cell wiring should be made carefully before applying power to avoid damages to the amplifier and the
load cells. The input resistance of the load cells that you want to connect should be ≥43 Ω(ohms). In case of a
four wire load cell the sense wires must be connected to the excitation i.e. pin 1 to pin 2 and pin 5 to pin 6, or
use the solder pads SW1 and SW2 on the underside.
5.5. Serial Port Connection
The RS232 port can be used for communication with a PC, PLC system or other devices. The Gnd terminal
(pin 19) must be used as signal ground for the RS232 interface.
Note: The serial port (Interface 2) can be switched into Modbus mode and back to ASCII mode. In Modbus
mode, this interface can run Modbus RTU protocol. The procedure to switch between the modes and the
Modbus RTU communication is described in the sepperate manual LDx_Modbus Comm_rev.1.0.
5.6. CAN Connection
The CAN lines can be connected to a CANopen master. Termination resistors must be present in the CAN
network, but there are no such resistors inside the LDU179.1. The Gnd terminal (pin 19) must be used as
signal ground for the CAN interface.
5.7. Function of the solder pads
The solder pads have the functions as described below. The label print and the photos shows the position of
the solder pads SWx.
LDU179.1 Top View
LDU179.1 Bottom View
Functions of the solder pads on bottom side:
SW1 & SW2 : Close for 4-wire load cells.
SW3 : Close to enter configuration mode.
SW4 : Do NOT close –used for program download only.
SW5 : This switch can connect the power supply ground to the shield.