Group Four Transducers GLDM 64.1 User manual

GLDM 64.1 Technical Manual rev. 1.30 February
2020
Page 1 of 50
Load Cell Digital Module
Type GLDM
64.1
TECHNICAL MANUAL FIRMWARE TYPE 0 (BASIC)
INCLUDING COMMUNICATION PROFILE
CANOPEN
Firmware Version 64.181.v.3.00 or higher
Hardware Version 64.105.v.1.xx
Document No. X64 Rev 1.30 EN

GLDM 64.1 Technical Manual rev. 1.30 February
2020
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1. Table of Contents:
1. Table of Contents: .....................................................................................................................................2
2. Safety Instructions ....................................................................................................................................5
Introduction and Specifications...............................................................................................................7
3. Hardware and Wiring.................................................................................................................................8
3.1. Housing & Terminals....................................................................................................................................8
3.2. Terminals Load Cell Connection .................................................................................................................... 8
3.3. Load Cell Connection ...................................................................................................................................8
3.4. Terminals Power Supply ...............................................................................................................................9
3.5. Service Port RS 232 .....................................................................................................................................9
3.6. CANbus Interface ........................................................................................................................................ 9
3.7. Seal Switch ............................................................................................................................................... 10
3.8. Logic Inputs & Outputs .............................................................................................................................. 10
4. Communication and Getting started .....................................................................................................11
4.1. Serial Interface.......................................................................................................................................... 11
4.2. Command Language .................................................................................................................................. 11
4.3. Baud Rate................................................................................................................................................. 11
4.4. Getting Started.......................................................................................................................................... 11
5. Commands –Overview ...........................................................................................................................12
6. Commands Description ..........................................................................................................................14
6.1. System Diagnosis Commands –ID, IV, IS, SR, RS ........................................................................................ 14
6.1.1. ID Get Device Identity ....................................................................................................................................14
6.1.2. IV Get Firmware Version................................................................................................................................14
6.1.3. IS Get Device Status......................................................................................................................................14
6.1.4. SR Software Reset.........................................................................................................................................15
6.1.5. RS Read Serial Number.................................................................................................................................15
6.2. Calibration Commands –CE, CM n, CI, MR, DS, DP, CZ, CG, ZT, FD, IZ, ZR, ZI, TM, TN, ZN, AZ, AG, CS ........... 15
6.2.1. CE Read TAC* Counter / Open Calibration Sequence...................................................................................15
6.2.2. CM n Set Maximum Output Value................................................................................................................15
6.2.3. CI Set Minimum Output Value........................................................................................................................16
6.2.4. MR Set Multi-range / Multi-interval.................................................................................................................16
6.2.5. DS Set Display Step Size...............................................................................................................................16
6.2.6. DP Set Decimal Point Position.......................................................................................................................16
6.2.7. CZ Set Calibration Zero Point.........................................................................................................................17
6.2.8. CG Set Calibration Gain (Span).....................................................................................................................17
6.2.9. ZT Enable / Disable Zero Tracking.................................................................................................................17
6.2.10. FD Reset to Factory Default Settings.............................................................................................................17
6.2.11. IZ Correction of System Zero......................................................................................................................18
6.2.12. ZR Zero Range...............................................................................................................................................18
6.2.13. ZI Initial Zero Range.......................................................................................................................................18
6.2.14. TM Tare mode.............................................................................................................................................18
6.2.15. TN Set / Clear Non-Volatile Tare....................................................................................................................19

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6.2.16. ZN Set / Clear Non-Volatile Zero....................................................................................................................19
6.2.17. AZ Absolute zero point calibration (eCal).......................................................................................................19
6.2.18. AG Absolute gain calibration (eCal) ...............................................................................................................19
6.2.19. CS Save the Calibration Data ........................................................................................................................19
6.2.20. FT Firmware Type........................................................................................................................................20
6.3. Motion Detection Commands –NR, NT ........................................................................................................ 20
6.3.1. NR Set No-motion Range...............................................................................................................................20
6.3.2. NT Set No-motion Time..................................................................................................................................20
6.4. Filter Setting Commands –FM, FL, UR......................................................................................................... 21
6.4.1. FM Filter Mode...............................................................................................................................................21
6.4.2. FL Filter setting...............................................................................................................................................21
6.4.3. UR Update Rate and Averaging.....................................................................................................................22
6.5. Taring and Zeroing Commands –SZ, ZA, RZ, ST, RT, SP............................................................................... 22
6.5.1. SZ Set System Zero.......................................................................................................................................22
6.5.2. RZ Reset Zero................................................................................................................................................23
6.5.3. ST Set Tare....................................................................................................................................................23
6.5.4. RT Reset Tare................................................................................................................................................23
6.5.5. SP Set Preset Tare ........................................................................................................................................23
6.6. Output Commands –GG, GN, GT, GS, GW, GA, GL, OF ................................................................................. 24
6.6.1. GG Get Gross Value......................................................................................................................................24
6.6.2. GN Get Net Value ..........................................................................................................................................24
6.6.3. GT Get Tare Value.........................................................................................................................................24
6.6.4. GS Get ADC Sample Value ...........................................................................................................................24
6.6.5. GW Get Data String “Net, Gross and Status“.................................................................................................24
6.6.6. GA Get Triggered Average Value...................................................................................................................24
6.6.7. GL Get Data String “Average, Gross and Status“ ..........................................................................................25
6.6.8. OF Output Format for Data String GW and GL ..............................................................................................25
6.7. Auto–transmit Commands –SG, SN, SX, SA, SL............................................................................................ 26
6.7.1. SG Send Gross Value continuously...............................................................................................................26
6.7.2. SN Send Net Value continuously ...................................................................................................................26
6.7.3. SX Send ADC Sample Value continuously.....................................................................................................26
6.7.4. SA Send Triggered Average Value automatically ..........................................................................................26
6.7.5. SL Send Data String “Average, Gross and Status“ automatically ..................................................................26
6.7.6. SW Send Data String “Net, Gross and Status“ continuously..........................................................................26
6.8. Commands for External I/O Control –IN, IO and OM .................................................................................... 27
6.8.1. IN Read status of the logic inputs...................................................................................................................27
6.8.2. IO Read / modify the status of the logic outputs.............................................................................................27
6.8.3. OM Control of the logic outputs by the host application..................................................................................27
6.9. Setpoint Output Commands –S’n’, H’n’, A’n’, HT .......................................................................................... 28
6.9.1. S‘n’ Setpoint Value.........................................................................................................................................28
6.9.2. H’n’ Hysteresis and Switching Action for a Setpoint.......................................................................................28
6.9.3. A’n’ Allocation source for a Setpoint...............................................................................................................29
6.9.4. HT Hold time for all Setpoints.........................................................................................................................29
6.10. Communication Setup Commands –AD, CR, NA, NS, BR, DX ......................................................................... 30
6.10.1. AD Device Address –Serial channel .............................................................................................................30
6.10.2. NA Network Address - CANbus .....................................................................................................................30
6.10.3. NS Network Settings –For Serial Channel and CAN Interface...................................................................30
6.10.4. BR Baud Rate –Serial channel......................................................................................................................31
6.10.5. DX Full Duplex –Serial channel.....................................................................................................................31
6.11. Save Calibration and Setup Data Commands –CS, WP, SS, GI, PI.................................................................. 32
6.11.1. CS Save the Calibration Data ........................................................................................................................32
6.11.2. WP Save the Setup Parameters.....................................................................................................................32
6.11.3. SS Save Setpoint Parameters........................................................................................................................32
6.11.4. GI Get an Image File from the EEPROM .......................................................................................................32
6.11.5. PI Download an Image File to the EEPROM..................................................................................................32
6.12. Trigger Commands –SD, MT, GA, TE, TR, TL, SA ......................................................................................... 33
6.12.1. SD Start Delay Time.......................................................................................................................................33
6.12.2. MT Measuring Time .......................................................................................................................................33
6.12.3. GA Get Triggered Average Value...................................................................................................................33
6.12.4. TE Trigger Edge.............................................................................................................................................33
6.12.5. TR Software Trigger.......................................................................................................................................33
6.12.6. TL Trigger Level.............................................................................................................................................34
6.12.7. SA Send Triggered Average Value automatically ..........................................................................................34

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6.12.8. Example of Live Checkweigher Measurement with DOP4.............................................................................35
6.13. Re-Trigger Commands –RW, TT, TS, DT, TW and TI.................................................................................... 36
6.13.1. RW Trigger Window for Re-Trigger Function .................................................................................................36
6.13.2. TT Averaging Time for Re-trigger Function.................................................................................................36
6.13.3. TS Stop Value for Re-trigger Function.........................................................................................................36
6.13.4. DT Short-time Averaging Period..................................................................................................................36
6.13.5. TW Window for Automatic Taring...................................................................................................................37
6.13.6. TI Averaging Time for Automatic Taring.........................................................................................................37
6.13.7. Example of Live Multihead Scale Measurement with DOP4...........................................................................38
7. CANopen interface ..................................................................................................................................39
7.1. General .................................................................................................................................................... 39
7.2. The PDOs ................................................................................................................................................. 40
7.3. The SDOs ................................................................................................................................................. 41
7.4. Communication Profile ............................................................................................................................... 41
7.5. Object Directory ........................................................................................................................................ 41
8. Use in “Approved” Applications............................................................................................................50

GLDM 64.1 Technical Manual rev. 1.30 February
2020
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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 Group Four
Transducers,
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, Group Four Transducers 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. Group Four Transducers, however, would
be obliged to be informed if any errors occur. Group Four Transducers cannot accept any liability for direct or
indirect damages resulting from the use of this manual.
Group Four Transducers reserves the right to revise this manual and alter its content without notification at any
time.
Neither Group Four Transducers 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 Group Four Transducers operating and maintenance instructions.
Group Four Transducers 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 Group Four Transducers
Products.
NOTICE: The contents of this manual are subject to change without notice.
Copyright © 2012-2020 by Group Four Transducers ApS, DK-3540 Lynge, Femstykket 6, Denmark
RIGHTS AND LIABILITIES
2. 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 Group Four Transducers 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 EQUIPMENTOR
BODILY HARM.
CAUTION OBSERVE PRECAUTIONS FOR HANDLING ELECTROSTATIC SENSITIVE
DEVICES.

GLDM 64.1 Technical Manual rev. 1.30 February
2020
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Introduction and Specifications
The model GLDM 64.1 is a very precise high-speed digital amplifier for weighing and force measurements with
strain gauge (SG) sensors. The GLDM 64.1 can be used in legal for trade (requires OIML R-76:2006 Part 1) as
well as for industrial applications.
The GLDM 64.1 features are CAN interface (supports CANopen protocol) and a full duplex RS232 interface
(supports a straight- forward ASCII command set).
The GLDM 64.1 and the well-known GLDU 78.1, both use nearly the same ASCII command set. The GLDM
64.1 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
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 (of GLDM 64.1)
CAN
Bit rate
kbits/s
10 to 1000
Protocol
CAN Open (CAN2.0B)
Interface 2 (of GLDM 64.1)
RS-232
Baud rate
bits/s
9600 to 460800
Frame format
8 data bits, 1 stop bit, no parity bits
Protocols
Readable ASCII
DIN Rail Port (of GLDM 64.1)
CAN
Bit rate
kbits/s
10 to 1000
Protocol
CAN Open (CAN2.0B)
Communication GLDM 64.1 to Gateway EGM
187.1
CAN Open (CAN2.0B)
Address range
1 to 99
Logical inputs
4
Maximum input voltage
VDC
30
Threshold voltage (approx.)
VDC
6
Input resistance (approx.)
kΩ
8
Logical outputs
4
Maximum voltage
VDC
30
Maximum current
A
1.0
Supply voltage
VDC
10 to 30
Power consumption
@ 24VDC and 350 Ω Load Cell
W
<0.75
Operating temperature range
°C
-15 to +55
Storage temperature range
°C
-30 to +70

GLDM 64.1 Technical Manual rev. 1.30 February
2020
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3. Hardware and Wiring
3.1. Housing & Terminals
Scale informations for ‘legal for trade’ use
Front Panel Terminals of GLDM 64.1
3.2. Terminals Load Cell Connection
GLDM
64.1
Load cell
input
Function
Pin no.
8
+ Exc
+Excitation for load cell
9
+ Sen
+ Sense for load cell
10
+ Inp
+ Signal of load cell
11
Shld.
Shield load cell
12
–Inp
–Signal of load cell
13
–Sen
–Sense for load cell
14
–Exc
–Excitation for load cell
Colour code of standard load cells (e.g.Group Four)
3.3. Load Cell Connection
The load cell wiring should be made carefully before energizing to avoid damages to the amplifier and the load
cells. The input resistance of the load cells that you want to connect should be ≥ 50 Ω (ohms).
In case of using a load cell/scale with 4 wire cable, you have to short-circuit (bridge) the pins 8 & 9 and 13 & 14.
Remark: Please don’t shorten the 4 wire cable of a load cell, as the cable is part of the factory calibration
(signal & temperature compensation).

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GLDM
64.1
Power in
Function
Pin no.
1
+
Power supply +10...30 V DC
2
-
Common ground / 0 V DC
3
Shld
.
Chassis ground
GLDM 64.1
RS 232
Functi
on
Pin no.
3
Rx
Receive Data
2
Tx
Transmit Data
5
GND
Signal ground RS 232
3.4. Terminals Power Supply
Depending on the grounding concept of the plant/scale, terminal 2 has to be connected to terminal 3.
Terminal 11 (shld. load cell) and 3 (Ground chassis) are internal connected.
Note: The power supply must be able to supply about 0.75W per GLDM 64.1.
3.5. Service Port RS 232
The service port RS 232 can be used for communication with a PC or PLC system, in parallel to the
CAN open interface.
The serial port supports ASCII Protocol.
3.6. CANbus Interface
The CANbus interface can be used for communication in a CANopen network
with transmission speed 10 ... 1000 kbit/s.
- The CAN lines CANH (5) and CANL (4) can be connected to aCANopen
master.
- Termination resistors must be present in the CAN network. A 120 Ω resistor
inside the GLDM 64.1 can be switched ON/OFF (using jumper 6).
- When used with the Gateway EGM 187.1, one 120Ω termination resistor is
present inside the gateway. The last GLDM on the CAN bus must also
have its termination resistor connected.
The factory default settings for communication are address 1 and
transmission speed 500 kbit/s.
Note: CANopen communication profile is described in this manual, see chapter 9 (pages 39 ff).
For changing the CAN address via front panel, just use the
Up/Down buttons below the Address display.

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Terminal
Connection
Function
15
IN 0
Logic Input 0
16
IN 1
Logic Input 1
17
IN 2
Logic Input 2
18
IN 3
Logic Input 3
19
C
Common of Input’s 0/1/2/3: 0V
20
OUT 0
Logic Output 0
21
OUT 1
Logic Output 1
22
OUT 2
Logic Output 2
23
OUT 3
Logic Output 3
24
C
Common of Output’s 0/1/2/3:
12 ... 24V or 0V
3.7. Seal Switch
Setup or changes of calibration can only be performed with an open
seal switch (7). Changes lead to get a new TAC value of +1.
Running a legal for trade application needs the jumper connected to
the switch pins and a seal. A broken seal shows up changes of
calibration, which are not allowed.
Protected commands see below.
Traceable Access Code (TAC) protected calibration commands
In case the seal switch is closed, the following commands or menus can’t be proceeded:
- Calibration Zero
- Calibration Gain
- Calibration Absolute Zero
- Calibration Absolute Gain
- Calibration Minimum
- Calibration Maximum
- Zero Tracking
- Zero Range
- Display Step Size
- Decimal Point
- Calibration Save
- Factory Default
- Non Volatile Tare
- Non Volatile Zero
- Initial Zero @ power ON
3.8. Logic Inputs & Outputs
The GLDM 64.1 offers 4 isolated logic inputs and 4 isolated logic outputs, all “floating”.
The input 0 can get the function to act as Trigger Button for a measurement, see chapter 8.12.6.
The 4 outputs act as switches for setpoints with hysteresis, switch behavior etc. Several bases can be used like
gross weight, net weight or average weight value, see chapter 8.9.x.
Note for Logic Inputs: The pulse duration must be at least 50ms.
Note for Logic Outputs: The connection C can be used for either ‘high’ level (24V AC/DC) or ‘low’ level (0V).

GLDM 64.1 Technical Manual rev. 1.30 February
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4. Communication and Getting started
4.1. Serial Interface
Communicating with the GLDM 64.1 is carried out e.g. via serial port RS 232.
The data format is the familiar 8/N/1 structure (8 data bits, no parity, 1 stop bit).
Available baud rates via RS232 port are: 9600, 19200, 38400, 57600, 115200, 230400 and 460800 baud.
Factory default: 115200 baud
4.2. Command Language
The command setup is based on a simple ASCII format (2 letters). This enables the user to setup the device,
get results or check parameters.
Example: Connect the GLDM 64.1 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 (GLDM 64.1)
responds
Meaning
ID
D:6410
Identity of the device
IV
V:0131
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.
• One GLDM 64.1, connected to a load cell or scale.
• A 12 to 24 VDC power supply capable of delivering approximately 0.75 W.
• One or more GLDM 64.1
• A suitable ASCII communication software **
Refer to the wiring diagram in chapter 5.
**
You can easily communicate between a PC and a GLDM 64.1 using programs such as Procomm,
Telemate, Kermit, HyperTerminal or HTerm etc.
Additional the powerful software DOP 4 (version 2.1.0.0 or higher) with graphical user interface and
oscilloscope function for the operating systems Windows XP / Vista / 7 / 8 / 10 is available.