Jetter JCM-501-E01 User manual

User Manual
JCM-501-E01
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Jetter AG
Graeterstrasse 2
71642 Ludwigsburg
Germany
Phone
Switchboard [phone]
Sales [phone]
Technical Hotline [phone]
E-mail
Technical Hotline [email protected]
Sales [email protected]
Translation of the original User Manual
Revision 4.08.1
Date of issue 1/29/2020
This document has been compiled by Jetter AG with due diligence, and based on the known
state of the art. Revisions and further development of our products are not automatically
mentioned in a reviewed document. Jetter AG shall not be liable for errors in form or content,
or for missing updates, as well as for damages or disadvantages resulting from such failure.

Jetter AG Table of contents
JCM-501-E01 User Manual iii
Table of contents
1 Introduction .....................................................................................................................................6
1.1 Information on this document .................................................................................................. 6
1.2 Typographical conventions......................................................................................................6
2 Safety ...............................................................................................................................................7
2.1 General information.................................................................................................................7
2.2 Purpose ...................................................................................................................................7
2.2.1 Intended use................................................................................................................7
2.2.2 Usage other than intended ..........................................................................................7
2.3 Warnings used in this document ............................................................................................. 7
3 Product description ........................................................................................................................8
3.1 Design .....................................................................................................................................8
3.2 Features ..................................................................................................................................8
3.3 Status indication ......................................................................................................................8
3.3.1 Diagnostics capabilities by means of status indication................................................9
3.4 Scope of delivery.....................................................................................................................9
3.5 Nameplate ...............................................................................................................................9
4 Technical specifications...............................................................................................................10
4.1 Dimensions............................................................................................................................10
4.2 Electrical properties............................................................................................................... 10
4.3 Mechanical specifications......................................................................................................11
4.4 Environmental conditions ...................................................................................................... 11
4.5 Acoustic signal generator ...................................................................................................... 11
4.6 Ports and interfaces ..............................................................................................................11
4.6.1 CAN port....................................................................................................................11
4.6.2 USB interface ............................................................................................................12
4.6.3 RS-232 interface .......................................................................................................12
4.7 EMI values.............................................................................................................................13
5 Mechanical installation.................................................................................................................14
5.1 Requirements for the installation location ............................................................................. 14
5.2 Installing the control ..............................................................................................................15
6 Electrical connection ....................................................................................................................16
6.1 Pin assignment of Deutsch connector................................................................................... 17
7 Programming.................................................................................................................................18
7.1 Abbreviations, module register properties and formats......................................................... 18
7.2 CANopen® STX API .............................................................................................................19
7.2.1 STX Functions...........................................................................................................19

Table of contents Jetter AG
iv JCM-501-E01 User Manual
7.2.2 Heartbeat monitoring.................................................................................................20
7.2.3 CANopen® Object dictionary ....................................................................................20
7.3 SAE J1939 STX API..............................................................................................................21
7.3.1 STX Functions...........................................................................................................21
7.4 Serial interface RS-232 ......................................................................................................... 22
7.4.1 Operating principle ....................................................................................................22
7.4.2 Registers - Description ..............................................................................................24
7.4.3 Programming.............................................................................................................29
7.4.3.1 Activating the serial interface ....................................................................................29
7.4.3.2 Configuring the serial interface..................................................................................29
7.4.3.3 Sending characters ...................................................................................................29
7.4.3.4 Receiving characters.................................................................................................29
7.4.3.5 Sending Texts ...........................................................................................................30
7.4.3.6 Sending values..........................................................................................................30
7.4.3.7 Receiving values .......................................................................................................30
7.5 Real-time clock...................................................................................................................... 31
7.6 File system ............................................................................................................................ 31
7.6.1 Directories .................................................................................................................31
7.7 Storage options - Overview ................................................................................................... 31
7.7.1 Types of program and data memory .........................................................................31
7.7.2 Operating system memory ........................................................................................32
7.7.3 File system memory ..................................................................................................32
7.7.4 Application program memory ....................................................................................32
7.7.5 Flash disk ..................................................................................................................32
7.7.6 USB flash drive..........................................................................................................33
7.7.7 Storing registers and variables..................................................................................33
7.7.8 Flag ...........................................................................................................................33
7.8 Automatic copying of controller data ..................................................................................... 34
7.8.1 Loading the Autostart function...................................................................................34
7.8.2 Executing the AutoStart function ...............................................................................35
7.8.3 Terminating the AutoStart mode ...............................................................................35
7.8.4 autostart.bat - Structure.............................................................................................35
7.8.5 Example of a command file .......................................................................................36
7.8.6 Data files ...................................................................................................................36
7.9 Operating system update ...................................................................................................... 37
7.9.1 Performing the operating system update via USB ....................................................37
7.9.2 Performing an OS update via JetEasyDownload ......................................................38
7.10 Application program .............................................................................................................. 38
8 Registers - Overview.....................................................................................................................40

Jetter AG Table of contents
JCM-501-E01 User Manual v
8.1 Default address on the CANopen® bus ................................................................................40
8.2 General overview - Registers ................................................................................................ 40
8.3 Flags - General overview ...................................................................................................... 40
8.4 Electronic nameplate.............................................................................................................40
8.5 Electronic name plate (device as a whole)............................................................................ 41
8.6 LEDs......................................................................................................................................41
8.7 CAN.......................................................................................................................................41
8.8 Serial interface RS-232 ......................................................................................................... 41
8.9 Flash memory........................................................................................................................42
8.10 System information................................................................................................................42
8.11 USB flash drive......................................................................................................................43
8.12 General system registers ...................................................................................................... 43
8.13 Application program .............................................................................................................. 44
8.14 File system/data file function ................................................................................................. 45
8.15 Application registers .............................................................................................................. 45
8.16 Flag .......................................................................................................................................45
8.17 System Functions..................................................................................................................46
8.18 System Functions..................................................................................................................48
8.19 Real-time clock...................................................................................................................... 48
9 Maintenance and repairs ..............................................................................................................50
9.1 Maintenance, repairs and disposal........................................................................................50
9.2 Storage and shipment ........................................................................................................... 50
10 Service ...........................................................................................................................................51
10.1 Customer service .................................................................................................................. 51
11 Spare parts and accessories .......................................................................................................52
11.1 Accessories ...........................................................................................................................52

Jetter AG Introduction | 1
JCM-501-E01 User Manual 6 / 55
1 Introduction
1.1 Information on this document
This document forms an integral part of the product and must be read and under-
stood prior to using it. It contains important and safety-related information for the
proper use of the product as intended.
Target groups This document is intended for specialists with appropriate qualifications.
Only competent and trained personnel is allowed to put this device into operation.
During the whole product life cycle, safe handling and operation of the device
must be ensured. In the case of missing or inadequate technical knowledge or
knowledge of this document any liability is excluded.
Availability of infor-
mation
Make sure this document is kept at the ready in the vicinity of the product
throughout its service life.
For information on new revisions of this document, visit the download area on our
website. This document is not subject to any updating service.
Start | Jetter - We automate your success.
For further information refer to the following information products:
■Version updates
Information about new versions of software products or of the operating sys-
tem of your controller.
■Online help of the JetSym software
Detailed description of software functions with application examples
■Application-oriented manuals
Information on file systems and communication interfaces
1.2 Typographical conventions
This manual uses different typographical effects to support you in finding and
classifying information. Below, there is an example of a step-by-step instruction:
üThis symbol indicates requirements which have to be met before executing
the following action.
►This sign or a numbering at the beginning of a paragraph marks an action in-
struction that must be executed by the user. Execute the instructions one after
the other.
ðThe target after a list of instructions indicates reactions to, or results of these
actions.
More information on this subject is available on our website.
Start | Jetter - We automate your success.
INFO In the info box you will find helpful information and practical tips about your prod-
uct.

Jetter AG Safety | 2
JCM-501-E01 User Manual 7 / 55
2 Safety
2.1 General information
At the time of placing on the market, this product corresponds to the current state
of the art and meets the recognized safety rules.
Besides this user manual, laws and regulations in the operator's country are rele-
vant to the operation of the product. The operator is responsible for complying
with the directives mentioned below:
■Applicable legislation, rules, and regulations
■Relevant accident prevention regulations
■Accepted safety rules
■EU directives and other country-specific regulations
2.2 Purpose
2.2.1 Intended use
The device is intended for controlling applications in the field of commercial vehi-
cles and mobile machines.
Operate the device only in accordance with the intended conditions of use, and
within the limits set forth in the technical specifications.
Intended use of the product includes its operation in accordance with this man-
ual.
SELV/PELV If this device is not used in a vehicle or mobile machine, a SELV or PELV power
supply unit must be used to supply the device.
2.2.2 Usage other than intended
This device must not be used in technical systems which to a high degree have
to be fail-safe.
Machinery Directive This device is no safety-related part as per Machinery Directive 2006/42/EC, and
must, therefore, not be used for safety-relevant applications. This device is NOT
intended for the purpose of personal safety, and must, therefore, not be used to
protect persons.
2.3 Warnings used in this document
DANGER High risk
Indicates an imminently hazardous situation which, if not avoided, will result in
death or serious injury.
WARNING Medium risk
Indicates a potential hazardous situation which, if not avoided, could result in
death or serious injury.
CAUTION Low risk
Indicates a hazardous situation which, if not avoided, could result in minor or
moderate injury.
NOTICE Material damage
Indicates a situation which, if not avoided, could result in malfunctions or material
damage.

Jetter AG Product description | 3
JCM-501-E01 User Manual 8 / 55
3 Product description
The JCM-501-E01 controller forms the heart of compact, distributed architec-
tures. With its numerous interfaces, as well as the proven, powerful 32-bit CPU, it
can be used in system solutions of simple to medium complexity.
3.1 Design
3
2
1
1 1
1
Fig.1: Device configuration
1Screw hole 2Deutsch connector
3Nameplate
3.2 Features
■Deutsch connector DT06-12S
■Ports and interfaces: 2x CAN, 1x USB, 1x RS-232 (all in Deutsch connector)
■CPU: ARM11, 500 MHz, 128 MB RAM, 512 MB Flash
■Front/rear degree of protection: IP65/IP65:
■Integrated real-time clock
3.3 Status indication
The JCM-501-E01 has 2 LEDs which can be configured by the user.
1 2
Fig.2: Status indication
1"D2" LED 2"D1" LED

Jetter AG Product description | 3
JCM-501-E01 User Manual 9 / 55
3.3.1 Diagnostics capabilities by means of status indication
Colors and flashing patterns of the LEDs are an excellent source of information to
analyze problems.
Diagnostics via the setup window of the JetSym software is another option.
LED Status Color Description
D2 OFF --- This LED is controlled by register 108008. If bit
2 and bit 3 of register 108008 are 0 at the same
time, the LED is off.
ON Red Bit 3 is set in register 108008.
ON Green Bit 2 is set in register 108008.
ON Orange In register 108008, bits 2 and 3 are set simulta-
neously.
D1 OFF --- This LED is controlled by register 108008. If bit
0 and bit 1 of register 108008 are 0 at the same
time, the LED is off.
ON Red Bit 1 is set in register 108008.
ON Green Bit 0 is set in register 108008.
The system is switched on (MR 108008=1).
ON Orange In register 108008, bits 0 and 1 are set simulta-
neously.
3.4 Scope of delivery
Scope of delivery Item number Quantity
JCM-501-E01 10001818 1
Installation manual 60884762 1
3.5 Nameplate
Fig.3: Nameplate
1Logo 2Serial number
3Barcode 4Article number and hardware re-
vision
5Model code number

Jetter AG Technical specifications | 4
JCM-501-E01 User Manual 10 / 55
4 Technical specifications
4.1 Dimensions
27.955
83
41.5
63.4
44.4
28
45.6
22.2
38.1
Ø
2.3
2x
R200
2.5°
119.8
104.8
R9.9
Fig.4: Dimensions (in mm)
4.2 Electrical properties
Power supply
VBAT_ECU
Category Description
Rated voltage DC 12 V or 24 V
Permissible voltage range
VBAT_ECU
DC 8 V ... DC 32 V
Maximum current 2 A
Typical current consumption
logic circuit (VBAT_ECU)
170 mA at DC 12 V
90 mA at DC 24 V
Power consumption Approx. 2 W
Integrated protective func-
tions
Reverse polarity protection, overvoltage, voltage
surges
Tab.1: Power supply VBAT_ECU

Jetter AG Technical specifications | 4
JCM-501-E01 User Manual 11 / 55
4.3 Mechanical specifications
Category Description Standards
Vibration
Broadband noise 10 Hz / 0.005 (m/s2)2/Hz DIN EN 60068-2-64
200 Hz / 0.02 (m/s2)2/Hz
300 Hz / 0.01 (m/s2)2/Hz
350 Hz / 0.002 (m/s2)2/Hz
Period 3x 24 h
Shock resistance
Type of shock Half-sine wave DIN EN 60068-2-27
Intensity and duration 30 g (300 m/s2) for 18 ms
Number and direction 18 shocks in all 6 direc-
tions
Degree of protection
Front panel: IP65 DIN EN 60529
Rear panel: IP65
Tab.2: Mechanical specifications
4.4 Environmental conditions
Category Description Standards
Operating temperature -20 … +65 °C ISO 16750-4
Climatic conditions Humid heat
Storage temperature -20 … +70 °C ISO 16750-4
DIN EN 60068-2-1
DIN EN 60068-2-2
Air humidity 10 … 95 % DIN EN 61131-2
Pollution degree 2 DIN EN 61131-2
Tab.3: Environmental conditions
4.5 Acoustic signal generator
Category Description
Type Speakers Adjustable frequency
and volume.
Volume 83 dB 10 cm distance and res-
onance frequency 2.670
Hz
Tab.4: Acoustic signal generator
4.6 Ports and interfaces
4.6.1 CAN port
CAN interfaces Category Description
Quantity 2 CAN_1 and CAN_2
Baud rate 125, 250, 500 kBaud
Protocol CANopen® SAE J1939
Default node ID on
the CANopen® bus
127 (0x7F)

Jetter AG Technical specifications | 4
JCM-501-E01 User Manual 12 / 55
Category Description
Bus terminating resistor CAN 1 Internally not installed.
CAN 2 Internally installed (120
Ω).
External bus termination Required for CAN 1 120 Ω
Cable specification Twisted pair conductors, unshielded
Tab.5: CAN interfaces
Specification - CAN
bus cable
Category Description
Wire cross-section 500 kBaud: 0.34 … 0.50 mm2
250 kBaud: 0.34 … 0.60 mm2
Cable capacitance 60 pF/m max.
Resistivity 500 kBaud: Max. 60 Ω/km.
250 kBaud: Max. 60 Ω/km.
Number of cores 2
Twisting CAN_L and CAN_H cables are twisted pairwise
Tab.6: Specification - CAN bus cable
Line lengths The maximum permitted cable length depends on the baud rate used and the
number of CANopen® devices connected.
Baud rate Max.
line length
Max. stub
line length
Total
line length
500 kBaud 100 m 5 m 30 m
250 kBaud 250 m 10 m 60 m
Tab.7: Line lengths
4.6.2 USB interface
INFO The USB port does not meet the immunity requirement of the E1 directive.
Therefore, use the USB port only for service purposes and not while the unit is in
operation.
Category Description
Supply unit 5 V, 500 mA max.
Data rate USB 2.0
High-speed type 480 MBaud max.
Protocol USB host interface
Line length limitation 30 cm
Tab.8: USB interface
4.6.3 RS-232 interface
Category Description
Baud rates Up to 115,200 baud 8N1
Connection topology 1x Deutsch connector socket
Tab.9: RS-232 interface

Jetter AG Technical specifications | 4
JCM-501-E01 User Manual 13 / 55
4.7 EMI values
The JCM-501-E01 has E1 approval according to ECE R10 Rev. 5 and CE con-
formity according to ISO 14982.
INFO The USB port does not meet the immunity requirement of the E1 directive.
Therefore, use the USB port only for service purposes and not while the unit is in
operation.
Pulses to ISO
7637-2
Test pulse Values Functional class
1 -450V C
2a +37V A
2b +20V C
3a -150V A
3b +150V A
4 Ua1: -12 V / 50 ms
Ua2: -5 V / 500 ms
A (24 V systems)
Ua1: -6 V / 15 ms
Ua2: -2.5 V / 1000 ms
C (12 V systems)
Tab.10: Pulses to ISO 7637-2
Irradiation to ISO
11452
Parameter Values Functional class
Protection against RF
noise
20 MHz ... 2 GHz 30 V/m A
Tab.11: Irradiation to ISO 11452
ESD EN 61000-4-2 ESD EN 61000-4-2 Values Functional class
Contact discharge ±4 kV (to conductive sur-
faces)
A
Discharge through air ±8 kV (to insulating sur-
faces)
A
Tab.12: ESD EN 61000-4-2

Jetter AG Mechanical installation | 5
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5 Mechanical installation
NOTICE Damages to material or functional impairment
Welding on the chassis may cause damages to material of the device, or impair
its functions.
►Before you start welding, disconnect all connections between the device and
the electric system of the vehicle.
►Protect the device from flying sparks and welding beads (splatter).
►Do not touch the device with the welding electrode or earth clamp.
5.1 Requirements for the installation location
The installation location must meet the following requirements:
■The installation location must allow air to circulate.
■The installation location must be of sufficient size.
■The device must be easily accessible to allow for service work.
Space required for
installation and ser-
vice
It should be possible to disconnect the connectors at any time.
70
Fig.5: Space requirements for installation work (in mm)
Avoiding unsuit-
able installation lo-
cations
The following installation locations are unsuitable for mounting the device:
Unsuitable installation location Reason
Outdoor installation The device must not be exposed to rain
or a jet of water. Do not use a steam jet
or other such devices to clean the de-
vice.
Installation location close to heat-sensi-
tive materials
The materials could become warped or
misshapen as a result of heat produced
by the device.
Tab.13: Unsuitable installation locations

Jetter AG Mechanical installation | 5
JCM-501-E01 User Manual 15 / 55
5.2 Installing the control
Screw holes
27.955
83
O3.1
4 x
Fig.6: All dimensions of screw holes are in millimeters.
Installing the strain
relief
Install strain reliefs for the connecting cables.
■Ensure that there is sufficient clearance between the strain reliefs and the con-
nectors.
■Connectors must not be obstructed, so that they can be removed in the event
of service.
Fig.7: Installing the strain relief

Jetter AG Electrical connection | 6
JCM-501-E01 User Manual 16 / 55
6 Electrical connection
NOTICE Damages to material or functional impairment
Improper implementation of the wiring harness may cause mechanical stress.
►Protect the cables from bending, twisting or chafing.
►Install strain reliefs for the connecting cables.
NOTICE Surges resulting from missing protection or fusing
Surges may cause malfunctions or damage to the product.
►Protect the voltage inputs from surges according to the requirements.
►Ensure that the device is handled in accordance with ESD regulations.

Jetter AG Electrical connection | 6
JCM-501-E01 User Manual 17 / 55
6.1 Pin assignment of Deutsch connector
Features The Deutsch connector has the following functions:
■Power supply to the JCM-501-E01
■CAN communication
■USB
■RS232
INFO Current consumption
When the JCM-501-E01 is energized, the current consumption is temporarily
higher. To ensure a reliable start-up of the device, provide at least 3 times the
typical current required.
1 6
712
Fig.8: Deutsch connec-
tor, 12 pins
12 CAN_2_H 1GND
11 CAN_2_L 2USB_+5V
10 CAN_1_H 3USB_D+
9CAN_1_L 4USB_D-
8RXD_RS232 5GND
7TXD_RS232 6VBAT_ECU
Mating parts Compatible mating parts for the 12-pin DEUTSCH connector are as follows:
Category Description
Manufacturer Deutsch
Manufacturer item num-
ber - Housing
DT06-12S
Manufacturer item num-
ber - Wedgelock
W12S
Manufacturer item num-
ber - Crimp contact (re-
ceptacle)
0-462-201-16141
Wire size range 1.0 ... 1.5 mm2(AWG 18 ... 16)

Jetter AG Programming | 7
JCM-501-E01 User Manual 18 / 55
7 Programming
7.1 Abbreviations, module register properties and formats
Abbreviations The abbreviations used in this document are listed in the table below:
Abbreviation Description
R 100 Register 100
MR 150 Module register 150
Tab.14: Abbreviations
Module register
properties
Each module register is characterized by certain properties. For many module
registers most properties are identical. For example, their value after reset is 0. In
the following description, module register properties are mentioned only if a prop-
erty deviates from the default properties listed below.
Property Standard design
Type of access Read/write
Value after reset 0 or undefined (e.g. revision/version number)
Takes effect Immediately
Write access Always
Data type Integer
Tab.15: Module register properties
Numerical formats The numerical formats used in this document are listed in the table below:
Notation Format of numerical val-
ues
100 Decimal
0x100 Hexadecimal
0b100 Binary
Tab.16: Numerical formats
JetSym sample pro-
grams
The notation for sample programs used in this document is listed in the table be-
low:
Notation Format of numerical val-
ues
Var, When, Task Keyword
BitClear(); Commands
100 0x100 0b100 Constant numerical values
// This is a com-
ment
Comment
// ... Further program processing
Tab.17: JetSym sample programs

Jetter AG Programming | 7
JCM-501-E01 User Manual 19 / 55
7.2 CANopen® STX API
CANopen® is an open standard for networking and communication, e.g. in the au-
tomotive sector. The CANopen® protocol has been further developed by the CiA
e.V. (CAN in Automation) and works on the physical layer with CAN Highspeed in
accordance with ISO 11898.
Specifications The CANopen® specifications can be obtained from the CiA e.V. homepage at
http://www.can-cia.org.
The key specification documents are:
■CiA DS 301 - This document is also known as the communication profile and
describes the fundamental services and protocols used under CANopen®.
■CiA DS 302 - Framework for programmable devices (CANopen® Manager,
SDO Manager)
■CiA DR 303 - Information on cables and connectors
■CiA DS 4xx - These documents describe the behavior of a number of device
classes in, what are known as, device profiles.
7.2.1 STX Functions
Application STX functions are used in the communication between the JCM-501-E01 and
other CANopen® nodes.
The JCM-501-E01 supports the following STX functions:
Features Description
CanOpenInit() The function CanOpenInit() lets you initialize
one of the CAN busses.
CanOpenSetCommand() The function CanOpenSetCommand() lets you
change the heartbeat status of the device itself and
of all other devices (NMT slaves) on the CAN bus.
CanOpenUploadSDO() The function CanOpenUploadSDO() lets you ac-
cess a particular object in the Object Directory of
the message recipient and read the value of the
object. Data is exchanged in accordance with the
SDO upload protocol.
CanOpenDownloadSDO() The function CanOpenDownloadSDO() lets you
access a particular object in the Object Directory of
the message recipient and specify the value of the
object. Data is exchanged in accordance with the
SDO download protocol.
CanOpenAddPDORx() By calling up the CanOpenAddPDORx() function,
process data, sent by other CANopen® devices,
can be entered for reception.
CanOpenAddPDOTx() By calling up the CanOpenAddPDOTx() function,
process data can be placed on the bus.
INFO Further information about STX functions can be found in the application-oriented
manual "CANopen® STX-API" on our homepage and in the JetSym online help.

Jetter AG Programming | 7
JCM-501-E01 User Manual 20 / 55
7.2.2 Heartbeat monitoring
The heartbeat protocol is for monitoring the activity of communication partners. If
the inactivity exceeds the set interval (Heartbeat consumer time), the status is set
to "offline".
The application program lets you define heartbeat functions, such as
■Displaying information to the user
■Rebooting the device
■Ignoring process data
INFO Further information about this subject can be found in the topic "Heartbeat moni-
toring" in the application-oriented manual "CANopen®-STX-API" on our home-
page.
7.2.3 CANopen® Object dictionary
The operating system of the JCM-501-E01 supports the following objects:
Index
(hex)
Object
(code) Object name Data type Type of access
1000 VAR Device type Unsigned32 RO (read
only)
1001 VAR Error Register Unsigned8 RO
1002 VAR Manufacturer status Unsigned32 RO
1003 ARRAY Pre-defined error field Unsigned32 RO
1008 VAR Manufacturer
Device Name
String const 1008
1009 VAR Manufacturer
Hardware Version
String const 1009
100A VAR Manufacturer
Software Version
String const 100A
100B VAR Node ID Unsigned32 RO
1017 VAR Producer
Heartbeat Time
Unsigned16 R/W
(read &
write)
1018 RECORD Identity Identity RO
1200 RECORD Server 1 -
SDO parameter
SDO
parameter
RO
1201 RECORD Server 2 -
SDO parameter
SDO
parameter
R/W
1203 RECORD Server 3 -
SDO parameter
SDO
parameter
R/W
1203 RECORD Server 4 -
SDO parameter
SDO
parameter
R/W
INFO Further information about this subject can be found in the topic "CANopen® Ob-
ject Directory" in the application-oriented manual "CANopen® STX-API" on our
homepage.