LORENZ MESSTECHNIK GM 80 User manual

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Operation Manual
DC Voltage Measuring Amplifier with Data Logger
GM 80
From Firmware Rev. 3
//TODO…

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1 Imprint
Manufacturer, Place
Lorenz Messtechnik GmbH, D-73553 Alfdorf
Valid for...
DC Voltage Measuring Amplifier GM 80 (from firmware rev. 3)
Copyright Note
© 2006-2013 Lorenz Messtechnik GmbH, Alfdorf
Interdiction of Reprint
Reprint in whole or in part with written permission, only.
Change Notice
Technical changes are reserved.

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2 Notes
2.1 General Notes
This operation manual is intended for technically qualified personnel with appropriate skills in the field of
measurement and automatic control techniques. The information regarding all safety precautions and
warnings in this manual as well as their flawless technical implementation is prerequisite for the safe in-
stallation, the commissioning, the safe operation and maintenance of Lorenz Messtechnik GmbH de-
vices. Therefore it is imperative that all measures are carried out by qualified personnel, only. All per-
sons involved with project planning, installation and operation of Lorenz Messtechnik GmbH devices
must be familiar with the safety concepts in automation and control technology and qualified in the
above mentioned sense.
For the sake of clarity, this operation manual may not constitute a detailed use of Lorenz Messtechnik
GmbH devices in all possible applications. Also, not all possible types of installation, operation and
maintenance are considered. If further information is required or should particular problems arise, which
are not or not sufficiently detailed represented in this manual, please request this information from Lo-
renz Messtechnik GmbH.
The safety precautions must observed in order to prevent property damage, injuries and/or even
death results.
Lorenz Messtechnik GmbH devices may only be operated in accordance with the applications
prescribed in this manual. Built-in appliances may be used professional installations, only.
With the connection and commissioning of the device, the buyer accepts the General Terms of Sale
and Delivery of Lorenz Messtechnik GmbH. Furthermore, the buyer accepts possible incompleteness
of the manual and that information described therein is subject to change. Errors and changes are re-
served.
Provisions for Use
A Lorenz Messtechnik GmbH device is used for displaying, processing and controlling of processes. It
may not be used as a sole instrument for the prevention of dangerous conditions of machines and
plants. Machinery and equipment must be designed in a way that erroneous states do not lead to a
dangerous situation for operators (e.g. by independent limit switches, mechanical interlocks). In particu-
lar, it must be ensured that an incorrect entry on the device, its malfunction or failure does not lead to
property damage or cause hazard to persons. It is also important to prevent the evasion of the security
provisions of a plant. Emergency stop equipment must always be active.
Installation Notes
Lorenz Messtechnik GmbH devices must be installed and connected in compliance with the relevant
DIN and VDE Standards. They must be installed in a way that inadvertent operation is sufficiently ex-
cluded. In order to avoid an undefined or hazardous state caused by interruption of the supply and sig-
nal lines, the appropriate hardware and software-related safety precautions must be observed. Supply
and signal lines must be installed in such way that impairment of function of Lorenz Messtechnik
GmbH devices cannot be caused by interfering signals (such as inductive or capacitive interference).

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Malfunction, Maintenance and Repair Notes
The devices do not contain parts which need or can be serviced by the user. Repairs may be carried
out by Lorenz Messtechnik GmbH, exclusively. If assuming that safe operation of the device is no
longer possible, it must be taken out of service and secured against inadvertent operation, immediately.
This applies in particular, if:
- the device shows visible damage
- the device is no longer functional
- parts of the device are loose
- the connection lines show visible damage
It is also pointed out that all obligations of Lorenz Messtechnik GmbH are exclusively arising from the
respective sales contract in which the warranty is conclusively settled.
2.2 Intended Use
Lorenz Messtechnik GmbH devices may only be used for measurement tasks and the directly related
control tasks. Any other use is considered improper.
2.3 General Dangers by not following the Safety Precautions
The device complies with the state of current safety requirements. Residual risks can occur, if the de-
vice is improperly used and operated by untrained personnel. Any person commissioned with the instal-
lation, operation and maintenance of the device must have read and understood the operation manual
and the safety precautions, in particular.
2.4 Residual Dangers
The device only covers part of the scope of measurement technology.
Safeguarding interests of the measurement technology must be planned and realized by the plant de-
signer/supplier in a way to minimize residual dangers. The valid rules regulations and laws must be ob-
served. Residual risks in connection with measurement technology must be pointed out.

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2.5 Safety and Caution Symbols
If residual risks occur while working with the device, the following symbols in this operation manual
must be noted:
Warning:
Warns of a potential risk of serious life-threatening injuries. The accident preven-
tion regulations of the employer’s liability insurance association must be consid-
ered.
Caution:
Warns of a potential danger of damage for the device, process, persons, or envi-
ronment.
Note:
Supplemental information.
Important / Tip:
Reference to more detailed technical information.
2.6 Health Protection and Safety
To ensure that our products are safe and do not pose health hazard, following points must be consid-
ered:
1. All relevant sections of this manual must be read attentively in prior to the operation.
2. All warning labels on containers and packages must be noted.
3. Installation, operation and maintenance work may only be carried out by accordingly trained per-
sonnel under observance of the given instructions. If one of these instructions is not considered,
the user of the product bears the complete responsibility for all consequences, occurring from the
failure to comply.
4. Before opening the device, it must be disconnected from any power supply.
2.7 Qualified Personnel
Qualified personnel are persons who are familiar with the installation, operation and the maintenance of
the device and have appropriate qualifications. The device shall only be used by qualified personnel ac-
cording to the technical data in connection with the following safety regulations and rules. During the
operation, legal and safety rules for the respective application case must be noted. The same applies
for the use of accessories.
2.8 Changes
The device may not be changed constructively or safety-related without the explicit permission of Lo-
renz Messtechnik GmbH. Any modification shall exclude liability on our part for damages resulting
from this. Repairs and changes to the circuit boards are prohibited.
3 Continuative Documents
Following documents contain reference information about //TODO…
-080599.pdf, data sheet of the DC Voltage Measuring Amplifier GM 80
-170197.doc, printer connection to the GM 80 Measuring Amplifier
-090235.doc, description driver installation for USB interface

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4 Contents
1Imprint .................................................................................................................................... 2
2Notes...................................................................................................................................... 3
2.1 General Notes...............................................................................................................3
2.2 Intended Use.................................................................................................................4
2.3 General Dangers by not following the Safety Precautions ............................................4
2.4 Residual Dangers..........................................................................................................4
2.5 Safety and Caution Symbols.........................................................................................5
2.6 Health Protection and Safety ........................................................................................5
2.7 Qualified Personnel.......................................................................................................5
2.8 Changes........................................................................................................................5
3Continuative Documents ........................................................................................................ 5
4Contents................................................................................................................................. 6
5Introduction ............................................................................................................................ 8
5.1 Product Description.......................................................................................................8
5.2 Power Supply................................................................................................................8
5.3 Safe and Proper Use..................................................................................................... 8
5.4 Dimensions –Weight ....................................................................................................8
6Instruction / Description of the Operating Mode ..................................................................... 9
6.1 Connection Description .................................................................................................9
6.2 Switching the Device on..............................................................................................10
6.3 Menu Description ........................................................................................................ 11
6.3.1 Brief Overview of the Menu Structure for the Operation ..................................11
6.3.2 Menu description.............................................................................................. 12
6.4 Operation Examples....................................................................................................13
6.5 Measuring with the GM 80 Measuring Amplifier.......................................................... 14
6.5.1 Selected Sensor............................................................................................... 14
6.5.2 Sensor Parameters ..........................................................................................14
6.5.3 Measuring with the GM 80 Measuring Amplifier............................................... 14
6.6 Serial Interface ............................................................................................................ 14
6.6.1 Transfer rate / specification RS232 (V.24) / USB............................................. 15
6.6.2 Protocol overview............................................................................................. 15
6.6.3 Printer: Type: E-GM 80 –DR: (optionally available) .....................................17
6.6.4 Operation via the serial Interface / USB...........................................................18
6.6.5 Operation and Function of the Data Logger ..................................................... 18
6.7 Adjustment Description ............................................................................................... 19
6.7.1 Adjustment to an active sensor with control signal (ACT wCON)..................... 19
6.7.2 Adjustment to an active sensor without control signal (ACT nCON) ................ 19
6.7.3 Adjustment to a passive sensor with control signal (PAS wCON).................... 19
6.7.4 Adjustment to a passive sensor without control signal (PAS nCON) ............... 20
6.7.5 Adjustment to current 4-20mA ......................................................................... 20
6.8 Interfaces and Connections ........................................................................................ 21
6.8.1 Connection for SG Sensors: ............................................................................ 21
6.8.2 Connection for active sensors:.........................................................................21
6.8.3 Visual Evaluation: ............................................................................................ 21
6.8.4 Trigger input:.................................................................................................... 21
6.8.5 RS232 / USB:................................................................................................... 21

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7Product Phases.................................................................................................................... 21
7.1 Transportation............................................................................................................. 21
7.2 Commissioning and Installation................................................................................... 21
7.3 Standard Operation..................................................................................................... 22
7.4 Maintenance and Cleaning ......................................................................................... 23
7.5 Safe Disposal.............................................................................................................. 24

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5 Introduction
This manual describes the features and installation procedures of the portable DC Voltage Measuring
Amplifier GM 80 from firmware version 3.
5.1 Product Description
The GM 80 is a DC Voltage Measuring Amplifier for passive or active sensors. A flexible data logger
can store up to 15288 measured values with time and date. Portable use is possible by battery or ac-
cumulator operation; however, it can also be operated with a power unit. Measuring or logging values
are transmitted via USB or RS-232 interface to a PC or a printer. Up to 10 parameter sets can be
stored. The adjustment data, the sensor designation and the physical unit are stored. Functions such as
tare, retrieve of min./max. and min./max.-delete are available during the measurement procedure. Via a
trigger input, the data logger or the interface can be controlled from the outside. If the GM 80 Measuring
Amplifier is being delivered with one or more sensors, these sensors will be adjusted to the GM 80
Measuring Amplifier and are immediately ready for operation. The assignment of the sensors to the cor-
responding parameter set can be documented on the back side of the device.
5.2 Power Supply
Mains operation:
Power supply: 6 V DC, min. 1,8A, safe from reverse polarity
Ripple: < 10%
Fuse: self-resettable fuse 1,5A
Undershoot/overshoot: can lead to erroneous measurements or defects.
Voltage peaks: are being discharged by fast protection components.
Voltage dropouts: voltage dropouts up to 10ms have no effect.
Warning:
Batteries must be removed during Mains Operation !
Use only supply voltages with ground reference, switching power supplies without ground refer-
ence can cause measurement errors.
Battery- / accumulator operation:
Battery operation: 4 x type: Mignon AA 1,5V
Accumulator operation: 4 x type: NiMH Mignon AA with min. 1500mAh and 1,2V
Power supply: if the permissible battery voltage falls below, the display will start to
blink. Please change the batteries/accumulators immediately,
otherwise no proper measurements can be ensured!
5.3 Safe and Proper Use
Caution:
- Protect the device against moisture, condensation, rain, snow....
- Protect the device against direct solar radiation
- Protect the device against dust and pollution
- Protect the device against excessive ambient temperature
- Protect the device against excessive vibration
5.4 Dimensions –Weight
Device dimensions in mm: L x W x H: 200x100x40 Weight: 0,5kg

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6 Instruction / Description of the Operating Mode
6.1 Connection Description
Key Description:
ENTER: Switch-on
Confirm, one step forward in the menu
ESC: Switch-off
Discard, one step back in the menu
: Scroll up, (press key constantly 
automatic display of the next digit etc.)
: Scroll down, (press key constantly 
automatic display of the next digit etc.)
USB: USB-socket for: USB-connector type B
RS232: RS232- socket for: 3,5mm pin 3pol.;front: GND; middle: RxD; outside: TxD
6V DC: Power supply socket for: 2,1mm barrel connector; inside: +6V DC; outside: GND
Trig: Trigger socket for: 2,5mm pin 2pol.; front: Trigger+; outside: GND
SENSOR: Sensor socket for: SUB-D HD 15pol.

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6.2 Switching the Device on
The device is activated and ready to operate as soon as ENTER was pressed.

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6.3 Menu Description
6.3.1 Brief Overview of the Menu Structure for the Operation

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6.3.2 Menu description
1 MEASURE
Measuring mode
SENSOR__
Sensor selection for measuring mode, Sensor 0 –9
Selection of the sensor parameter set for the measurement. The sensor pa-
rameter set must comply with the connected sensor.
2 SYSTEM
All system parameters are stored in this menu column.
2.1 LANG
Language adjustment
The menu language is available in English, German, French and Spanish.
2.2 INFO
Information query was factory-configured and is not modifiable.
SW no.
Firmware version, important for technical questions.
2.3 SCI
Interface configuration
BAUD
Baud rate adjustment; it must comply with the receiver (Pc or printer).
SCI MODE
The interface configuration only refers to the measuring mode, not the
log mode!
SCI off
Interface switched off
HAND
When pressing ENTER in the measuring mode, a measured value is dis-
played.
AUTO1
Interval time, adjustable from 10ms to 1h (at high measuring rate only possible
with the highest baud rate).
TRIGGER
INTERFAC
USB
RS232
At rising edge on the trigger input, in measuring mode a measured value is
displayed.
Interface selection.
USB interface is activated.
RS232 interface is activated.
2.4 RATE
Measuring rate1and average value
RATE
Measuring rate adjustment, selectable from 1/s to 1000/s. For fast procedures
(screw joint, insert press...) always select a fast measuring rate, e.g. 1000/s,
for very slow procedures select a small rate, e.g. 1/s.
AVERAGE
Average determination, the numbers indicate the average determination by the
amount of measurements. Applicable for e.g. vibrations, control oscillations...
2.5 PASS
Password query
Entering password 9373 allows to change to menu 3 ADJUST. Here, the sen-
sor parameters can be changed.
2.6 LCD
LCD contrast setting
If the LCD becomes unreadable by external influences, e.g. solar radiation,
heat or cold, the LCD contrast can be changed by pressing key or .
2.7 LOGG
Data logger settings
LOGGMODE
Data logger configuration
LOGG off
Off-switch for logger operation, measuring mode possible, only.
HAND
With each keystroke on ENTER a log value is accepted.
AUTO
Adjustment of the measurement intervals for the automatic measured value
storing.
DIAGRAM
With each rising edge of the trigger signal, a log value is accepted.
WINDOW
The window operation is started by a rising trigger edge and can be finished
only by a falling edge. During this time, measured values are stored in 1ms
raster in the data logger.
LOGGSEND
Log values are issued through the interface, press ENTER twice.
LOGG DEL
Log values are deleted after a safety query. Before deleting, please assure that
the data was received as requested.
2.8 DATE
Date and time setting
DATE
Date
TIME
Time
3 ADJUST
Adjustment Menu
This menu is active only, if the password has been entered in menu mode
2.5PASS. For the adjustment, the sensor must be connected to the sensor
socket.
Sensor__
Sensor number or the name of the sensor to be adjusted.
POINTDIS
Final measurement value of the sensor with decimal indication e.g. 1000;
100,0; 10,00; 1,000. The numerical values are variable, 4 digits are available.
Change to menu mode POINTDIS. After pressing ENTER, the final measure-
1If the SCI AUTO interval time is shorter than the adjusted measuring rate, the same measured value will be
issued on the interface until a new value is entered.

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ment value of the sensor can be entered. With keys and/or the first digit
can be edited, go to the next figure by pressing ENTER. When all 4 digits are
edited, the decimal point gets shifted by keys and/or . Press ENTER to
complete the entry, the final value will then be stored in the GM 0 measuring
amplifier.
UNIT
Entry of the physical unit, e.g. kg, Ncm, t, gr, kN, Nm, bar...
ADJUST
Sensor type selection (active with 100 % control signal, with 100 % control
signal, active without 100 % control signal, passive with 100 % control signal,
passive without 100 % control signal, 4 –20mA
DESIG
Name of the sensor, e.g. sensor 1, 2, 3, DR-2112, silo, tank, mixer, scale1,
motor, test1..
6.4 Operation Examples
- The GM 80 measuring amplifier is activated by pressing ENTER.
- Check time and date in menu mode SYSTEM and adjust if necessary.
-Adjust language
Enter menu mode 2 SYSTEM –2.1 LANG. When the ENTER key is pressed, the GM 80 Measur-
ing Amplifier is in the selection mode. With key or  the language can be selected. With EN-
TER, the selected language will be stored. Now, the menu is displayed in the selected language.
With ESC, the selected language is discarded.
-Adjust time
Enter menu mode 2 SYSTEM –2.8 TIME. Select TIME. When the ENTER key is pressed, the ac-
tual adjusted time will be displayed. Press ENTER again and the time can be adjusted. Adjust the
hours with key or . Press the ENTER key again and the minutes can be adjusted with key 
or . Press ENTER and time will be stored. By ESC, the currently adjusted time will be discarded
- Change to measuring mode
In menu mode 1 MEASUR, a list of all sensors is called by pressing ENTER the list of all sensors is
called. With key or a sensor parameter set can be selected. By ENTER the GM 80 Measuring
Amplifier is being adjusted to this sensor parameter set. The ESC key allows to return to the menu
mode 1 MEASUR from any menu mode.
- Change measuring rate from the measuring mode
The measuring mode can be left by pressing ESC. After pressing ESC again, the GM 80 Measuring
Amplifier is in menu mode 1 MEASUR. From there, the menu mode 2 SYSTEM –2.4 Rate can be
called. Select RATE by key or . By pressing ENTER the first adjusted measuring rate is dis-
played. By key or a new measuring rate can be adjusted. By ENTER the new measuring rate will
be taken over, by ESC the new measuring rate will be discarded
- Switch-off the GM 80 Measuring Amplifier
In menu mode 1 MEASUR, the GM 80 Measuring Amplifier can be switched-off by pressing ESC for
>1 sec.

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6.5 Measuring with the GM 80 Measuring Amplifier
Description with an example:
6.5.1 Selected Sensor
Force sensor, meas. range: 200kN
Sensitivity.: 2mV/V
Designation e.g.: PRESS
Parameter set: sensor no.: 3
Option: 100 % control signal
6.5.2 Sensor Parameters
After entering the password (9373) in menu mode 2SYSTEM-2.5PASS, the sensor can be applied in
the adjustment menu.
Following parameters are available:
Sensor__ Sensor no. 3 Sensor 0 –9 possible
POINTDIS 200,0 Adjust meas. range and decimal point (max. 9999)
UNIT _kN 1 –3-digit unit possible
DESIGN Press Up to 8 digit name (or numbers) freely selectable
ADJUST PAS_wCON Select “Passive with 100 % control signal”. See sensor data
sheet.
0% LOAD Unload sensor 0% sensor value is assigned to display 0.
100% CON Autom. adjustment 100% sensor value is assigned to display 200,0kN.
SAVE ENTER or ESC Confirm or discard
6.5.3 Measuring with the GM 80 Measuring Amplifier
In order to measure with this sensor, the sensor "Press" is selected in the measuring mode. During the
measurement, a minimum and maximum value buffer can be accessed with key . The displayed min-
imum or maximum value in each case can be deleted by pressing ENTER.
If the measured value will be sent to a pc or printer via an interface, the appropriate interface must be
selected, the baud rate must be matched to the recipient and in SCI-MODE, the operating mode must
be chosen. For example: HAND, a measured value with time is displayed each time you press ENTER
during the measurement.
For data logging, adjust the operating mode in the logger mode, e.g. choose AUTO and interval time
e.g. 10 sec and go to the measuring mode. A measured value with time is now stored every 10 sec. In
mode LOGGSEND, these data can then be sent via the interface
Note:
During operation with a USB-interface, the baud rate must also be set correctly. It must match
the baud rate of the virtual COM port of the receiving PC.
6.6 Serial Interface
For the serial data transmission the GM 80 Measuring Amplifier uses either an
RS232 or a USB interface. The PC manages the USB interface as a virtual COM
port. For the use of the USB interface, must have a Windows operating system (2k,
XP, Vista, 7) and the Lorenz Messtechnik GmbH USB driver must be installed
(see Chapter 3 –Continuative Documents for the Installation). After installing the
drivers, the virtual COM port can be used as described below.

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6.6.1 Transfer rate / specification RS232 (V.24) / USB
Parity: none
Number data bits: 8 (1Byte)
Stop bit: 1
Baud rate: settable (2400; 4800; 9600; 19200; 38400; 115200 Baud)
In the USB mode, the baud rate in the GM 80 Measuring Amplifier must match
with the connected device
6.6.2 Protocol overview
Via the serial interface, the GM 80 Measuring Amplifier can issue the measured values individually or
automatically. The commands can be send to the GM 80 Measuring Amplifier via a terminal program or
a PLC. Following commands are available:
6.6.2.1 Command overview
ASCII
HEX
Description
In Measuring
Mode
Not in Measuring
Mode
k
0x6B
ENTER


l
0x6C



m
0x6D



n
0x6E
ESC


A
0x41
Read-out data logger


C
0x43
Read-out current sensor parameters


D
0x44
Read-out status


E
0x45
Read-out complete status


g
0x67
Change protocol setup


0
0x30
Continuous measured value query (signed integer)

1
0x31
Query of max. value (signed integer)

2
0x32
Query of min. value (signed integer)

3
0x33
Tare of display

4
0x34
Reset max. value

5
0x35
Reset min. value

6
0x36
Actuate 100 % 100 % control signal –for sensors with 100 %
control resistance

7
0x37
Switch-off 100 % 100 % control signal –for sensors with 100
% control resistance

B
0x42
Delete data logger

a
0x61
Write time

b
0x62
Read-out time

c
0x63
Write company head

e
0x65
Write all sensor parameters (not supported yet)

f
0x66
Read- all sensor parameters (not supported yet)

In menu 3: ADJUSTUNIT and ADJUST-DESIG, the adjustments cannot
be changed by the commands “l” and “m”.
8N1

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6.6.2.2 Read-out of actual sensor parameters:
Sensor designation
8Byte
ASCII
Final display value
2Byte
packed BCD-number
Unit
3Byte
ASCII
Sensor type and digit
1Byte
0xAB: A ... 0xAB: A ... Sensor type, B ... digit (binary coded)
Sensor type:
0xXXXX XXXX
||||
0000 ...active with 100 % control signal adjust 0%Load and 100%Load
0001 ...active without 100 % 100 % control signal adjust 0%Load and 100%Load
0010 ...active without 100 % 100 % control signal adjust 0%Load and 100%Load V
0011 ...active without 100 % 100 % control signal adjust 0%Load V and 100%Load V
0100 ...passive with 100 % 100 % control signal adjust 0%Load and 100%Load
0101 ...passive without 100 % 100 % control signal adjust 0%Load and 100%Load
0110 ...passive without 100 % 100 % control signal adjust 0%Load V and enter
100%Load in mV/V
0111 . passive without 100 % 100 % control signal enter 0%Load mV/V and enter
100%Load in mV/V
1000 ... Current adjust 0%Load and 100%Load
1001 ... Current adjust 0%Load and enter 100%Load in mA
1010 ... Current enter 0%Load in mA and enter 100%Load in mA
Digit:
0xXXXX XXXX
||||
|000 ... _5000___
|001 ... _5,000__
|010 ... _50,00__
|011 ... _500,0__
|100 ... 5,000___
0%Load
2Byte
HEX-value (MSB/LSB)
100% Load
2Byte
HEX-value (MSB/LSB)
6.6.2.3 Read-out status:
Status
2Byte
General error condition of the GM 80 measuring amplifier
6.6.2.4 Read-out complete status:
Status
2Byte
General error condition of the GM 80 measuring amplifier
Meas. rate
1Byte
0x01 … 1000/s
0x02 … 100/s
0x03 ... 10/s
0x04 ... 1/s
Average value
1Byte
0x01 ... x/1
0x02 ... x/2
0x04 ... x/4
0x08 ... x/8
0x10 ... x/16
0x20 ... x/32
SCI_MODE
1Byte
0x00 ... interface is off mode
0x04 … hand mode
0x08 … automatic mode
0x0C … trigger mode
SCI_MODE_DELAY
1Byte
0x02 … 10ms
0x03 … 100ms
0x04 … 1s
0x05 … 10s
0x06 ... 1min
0x07 ... 10min
0x08 ... 1h
LOGGMODE
1Byte
0x00 ... logger is off mode
0x04 ... hand mode
0x08 ... automatic mode
0x0C ... DIAGRAM mode
0x10 ... windows mode
LOGGMODE_DELAY
1Byte
0x01 … 1ms
0x02 …10ms
0x03 … 100ms
0x04 … 1s
0x05 … 10s
0x06 ... 1min
0x07 ... 10min
0x08 ... 1h
Language
1Byte
0x00 ... GERMAN
0x02 ... ENGLISH
0x04 ... FRENCH
0x06 ... SPANISH
Protocol status
1Byte
0xXXXX XXXX (binary coded)
|||| ||||
|||| |||1 ... do not send final character
|||| ||1 ... send CR/LF
|||| |1 ... send CR
|||| 1 ... send LF
6.6.2.5 Write time:
Writing time is the same as the data block for the receipt of time. However, the data block for writing is
secured with a check sum and the associated weighted check sum.

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6.6.2.6 Read Time:
With following read-out:
DAY.MONTH.YEAR
2xSpace
HOURS:MINUTES:SECONDS
6.6.2.7 Write Company Head:
The entry ends either if 256 characters are received or if the character ETX (0x03) Strg-C is contained
in the character string.
6.6.2.8 Read Company Head:
By this command, the company head, which is stored in the GM 80 Measuring Amplifier, is read-out.
6.6.2.9 Write all Parameters:
The writing data block of all sensor parameters is identical with the receiving data block for reading all
parameters. However, for the writing of the sensor parameters a check sum and the referring weighted
checksum is required.
6.6.2.10 Read all Parameters:
The read-out of all parameters from sensor 1 to sensor 10 occurs in following sequence:
Sensor designation
Final displayed value
Unit
Sensor type (adjustment type) / decimal point
Adjustment values 0% Load, 100% Load with 2Bytes each
See command „read current sensor parameters“
6.6.2.11 Change Protocol Setup:
Protocol status
1Byte
0xXXXX XXXX (binary coded)
|||| ||||
|||| |||1 ... do not send final character
|||| ||1 ... send CR/LF
|||| |1 ... send CR
|||| 1 ... send LF
6.6.2.12 Calculation of the Check Sum (CS) and the Weighted Check Sum (gewCS):
The calculation occurs via all parameter bytes (without the command byte). At the CS all bytes are add-
ed (overflows are not considered here). For the calculation of the gewCS, the CS is added to the
gewCS. At an overflow, the gewCS is incremented by 1.
6.6.3 Printer: Type: E-GM 80 –DR: (optionally available)
With this small thermal printer and the supplied connection cable enables read-out and printing of the
measured values and the corresponding time from the GM 80 Measuring Amplifier. By the integrated
accumulators, mobile application is possible. The accumulators can be charged by using a power sup-
ply unit; mains operation is also possible. A baud rate of 9600 baud must be adjusted at the GM 80
Measuring Amplifier.

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6.6.4 Operation via the serial Interface / USB
Formatting the serial interface output:
Output format in SCI Mode:
HAND:
Sign, measured value, unit, time and CRLF
AUTO:
10ms
Signed integer and CRLF
100ms
Signed integer and CRLF
1s
Sign, measured value, unit, time and CRLF
10s
Sign, measured value, unit, time and CRLF
1min
Sign, measured value, unit, time and CRLF
10min
Sign, measured value, unit, time and CRLF
1h
Sign, measured value, unit, time and CRLF
TRIGGER:
Signed integer and CRLF
Output format in LOGG mode:
HAND:
Sign, measured value, unit, time and CRLF
AUTO:
Sign, measured value, unit and CRLF
DIAGRAM:
Sign, measured value, unit and CRLF
WINDOW:
Sign, measured value, unit and CRLF
Adjustments in SCI-Mode
SCI Off
In this setting, a transfer of measured values from the GM 80 is disabled. However, the
GM 80 can be addressed with the GM 80 commands
HAND
In this mode, a measured value is issued via the serial interface when ENTER is
pressed at the GM 80 Measuring Amplifier.
AUTO
In this mode a measured value is issued via the serial interface in the adjusted delay.
TRIGGER
At a trigger event in this mode, a measured value is issued via the serial interface. The
trigger pulses can occur in 10ms raster. The edge of the trigger pulse must be on HIGH
for at least 4ms. After that, it must be on LOW for at least 6ms.
6.6.5 Operation and Function of the Data Logger
If the GM 80 Measuring Amplifier is not the measuring mode, the data logger can be read either via
menu point 2.7 LOGG –SENDING, or by the command “A” via the interface. Outside of the measuring
mode, the data logger can only be deleted via menu point 2.7 LOGG –DELETION.
If the GM 80 Measuring Amplifier is in the measuring mode, the data logger can be read by command
"A" and deleted by command "B"
If the measuring mode is being selected from the menu point 1MEASURING-sensor selection, the start-
ing time of the measurement, the current sensor designation, the final value of the measuring range, the
adjusted measuring rate and the logger mode (e.g.: AUTO 1ms) are saved in the logger.
NOTE: All previous measured values are deleted by this!
During the read-out of the data logger via the serial interface, different adjustments are sent by the GM
80 Measuring Amplifier
a) Company head
b) Starting time of the measurement
c) Sensor designation
d) Final displayed value
e) Adjusted measuring rate
f) Adjusted logger mode
g) Thereafter, the measured values
In the HAND MODE the measured values and the time are logged.
Only the measured values are logged in the LOGGMODE AUTO. The time can be assigned to each
measured value by the indicated starting time. Since in GRAPHS and in the WINDOW MODE, trigger
events < 1sec can occur, an additional time log is not realizable at the moment.

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Adjustments in the LOGG-Mode
LOGG OUT
Here the data logger is switched off. The log mode in the measuring mode is switched
to "LOGG OUT" as soon as the entire data logger has been edited.
HAND
In this mode a measured value is written into the data logger when the ENTER key was
pressed at the GM 80 Measuring Amplifier. By an additional log of time, there is a time
assignment for each measured value.
AUTO
In this mode, depending on the adjusted delay, a measured value is written into the data
logger. By the stored starting time there is a time assignment for each measured value.
GRAPH
In this mode, at a trigger event, a measured value is written into the logger. Since the
trigger pulses occur in 10ms raster, an additional log of the time is not possible. The
edge of the trigger pulse must stand on HIGH for 4ms at least. Then it must be on LOW
for at least 6ms.
WINDOW
This mode reacts to rising and/or falling edges. At a falling edge, the logging of the
measured values is started. From now on the measured values are written in the data
logger with 1ms raster. A falling edge ends the recording.
Trigger Signal
Read Values
Memory depth of the data logger –see chapter 0.
6.7 Adjustment Description
6.7.1 Adjustment to an active sensor with control signal (ACT wCON)
Adjustment possibilities:
- After pressing ENTER, the automatic adjustment procedure is started. The device first reads the 0%
load value and displays WARM UP. Then the 100% load value is read-in and displayed during the
WARM UP again. After this procedure, the device displays SAVE?. This indicator should be con-
firmed either by pressing ENTER to store the adjustment values in the GM 80 Measuring Amplifier,
or ESC to cancel.
6.7.2 Adjustment to an active sensor without control signal (ACT nCON)
Adjustment possibilities:
- adjust 0% load and 100% load
- adjust 0% load and enter hub [100% load in V –0% load in V]
- enter 0% load in V and the hub [100% load in V –0% load in V]
By pressing or 0% LOAD or the nominal value can be selected.
0%LOAD unload sensor
or NOMVALUE input of the nominal value in V.
By pressing or 100% LOAD or the nominal value can be selected
100%Load adjustment by 100 % load (apply the nominal load)
or NOMVALUE input of the nominal value in V:
SAVE Query for takeover of the adjusted data.
6.7.3 Adjustment to a passive sensor with control signal (PAS wCON)
Adjustment possibilities:
- After pressing ENTER, the automatic adjustment procedure is started. The device first reads the 0%
load value and displays WARM UP. Then the 100% load value is read-in and displayed during the
WARM UP again. After this procedure, the device displays SAVE?. This indicator should be con-
firmed either by pressing ENTER to store the adjustment values in the GM 80 Measuring Amplifier,
or ESC to cancel.

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6.7.4 Adjustment to a passive sensor without control signal (PAS nCON)
Adjustment possibilities:
- adjust 0% load and 100% load
- adjust 0% load and enter 100% load in mV/V
- enter 0% load in mV/V and 100% load in mV/V
Select between 0 % load or nominal value by pressing or 
0%LOAD unload sensor
or NOMVALUE input of the nominal value in mV/V
Select between 100 %load or nominal value by pressing or 
100%Load Adjustment by 100 % load (apply nominal load)
or NOMVALUE input of the nominal value in mV/V
SAVE Query for takeover of the adjusted data.
.
6.7.5 Adjustment to current 4-20mA
Adjustment possibilities:
- adjust 0% load and 100% load
- adjust 0% load and enter 100% load in mA
- enter 0% load in mA and 100% load in mA
Select between 0 % load or nominal value by pressing or 
0%LOAD unload sensor
or NOMVALUE input of the nominal value in mA (fixed value 4 –20mA)
Select between 100 %load or nominal value by pressing or 
100%Load Adjustment by 100 % load (apply nominal load / nominal torque)
or NOMVALUE input of the nominal value in mA
SAVE Query for takeover of the adjusted data
.
Note:
If no sensor can be selected and/or the sensor does not enter into the meas-
uring mode, the sensor/parameter set was not adjusted correctly.
Re-adjustment