Peak PCAN-Repeater DR User manual

CAN Repeater for Decoupling
Bus Segments
User Manual
PCAN-Repeater DR
Document version 2.3.0 (2023-02-22)

PCAN-Repeater DR – User Manual
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Relevant products
Product Name Model Part number
PCAN-Repeater DR Industry IPEH-004038
PCAN® is a registered trademark of PEAK-System Technik GmbH.
Other product names in this document may be the trademarks or registered
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© 2023 PEAK-System Technik GmbH
Duplication (copying, printing, or other forms) and the electronic distribution of this
document is only allowed with explicit permission of PEAK-System Technik GmbH.
PEAK-System Technik GmbH reserves the right to change technical data without
prior announcement. The general business conditions and the regulations of the
license agreement apply. All rights are reserved.
PEAK-System Technik GmbH
Otto-Röhm-Straße 69
64293 Darmstadt
Germany
Phone: [phone]
Fax: [phone]
www.peak-system.com
[e-mail]
Document version 2.3.0 (2023-02-22)

PCAN-Repeater DR – User Manual
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Contents
1Introduction 4
1.1 Properties at a Glance 4
1.2 Operation Requirements 5
1.3 Scope of Supply 5
2Installation 6
2.1 CAN Ports 6
2.2 Power supply connection 6
2.3 Influence on Maximum Bus Length 7
2.4 CAN Termination 7
2.5 Transmission Limitation 9
3Operation 11
3.1 Initial Steps 11
3.2 Status LEDs 12
3.3 Bus Load and Error Indication 12
4Application Examples 14
4.1 Decoupling of Two Bus Segments 14
4.2 Implementation of a Long Stub Line 15
5Technical Specifications 16
Appendix A Conformity 18
A.1 CE Certificate 18
A.2 UKCA Certificate 19
Appendix B Dimension Drawing 20
Appendix C Operation in a CAN FD Bus 21

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1Introduction
The PCAN-Repeater DR establishes a galvanic isolation of up to 5 kV
within a High-speed CAN bus. The two CAN ports are decoupled
from each other and from the power supply. All message traffic
including error frames is forwarded 1 to 1 between both ports. The
PCAN-Repeater DR behaves passively and is transparent from the
perspective of the CAN bus. LEDs display the current bus status.
The PCAN-Repeater finds application in the realization of long stub
lines or the galvanic isolation of two CAN bus segments. With its
DIN rail casing and extended temperature range support, it is
suitable for use in an industrial environment.
The PCAN-Repeater DR can be used in CAN FD buses with data bit
rates up to 4 Mbit/s and nominal bit rates up to 1 Mbit/s. For
operating the PCAN-Repeater DR in a CAN FD bus, there are notes
in Appendix C on page 21.
Please note: Due to the CAN protocol, the maximum length of a
CAN bus depends on the bit rate. Therefore, a bus cannot be
extended with the PCAN-Repeater DR. The physical total length of
the CAN bus is reduced with each built-in PCAN-Repeater DR
according to its signal delay.
1.1 Properties at a Glance
Two High-speed CAN ports (ISO 11898-2)
Bit rates from 5 kbit/s up to 1 Mbit/s
Compliant with CAN specifications 2.0A (11-bit ID) and
2.0B (29-bit ID)
NXP CAN transceiver PCA82C251

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Suitable for the use in CAN FD buses with data bit rates up to
4 Mbit/s and nominal bit rates up to 1 Mbit/s
Connections for CAN and power supply via 4-pin screw terminal
block (Phoenix)
LEDs display CAN bus load and CAN errors
(only for CAN 2.0 A/B)
Each CAN port can be selectively terminated
Galvanic isolation rated up to 5 kV according to IEC 60601-1,
between both CAN ports and between CAN and power supply
Plastic casing (width: 22.5 mm) for mounting on a DIN rail (IEC
60715 TH35)
Voltage supply from 8 to 30 V
Extended operating temperature range from -40 to +85 °C
(-40 to +185 °F)
1.2 Operation Requirements
Power supply in the range of 8 to 30 V DC
1.3 Scope of Supply
PCAN-Repeater DR in DIN rail plastic casing
3 mating connectors (Phoenix, type: MSTB 2,5/4-ST BK) for
power supply and CAN connectors

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2Installation
2.1 CAN Ports
Both CAN ports CAN 1 and CAN 2 are located on the upper side of
the casing.
Pin Assignment
1 CAN-High
2 CAN-Low
3 CAN-GND
4 CAN-Shield1
2.2 Power supply connection
The connection for the power supply is located on the lower side of
the casing.
Pin Assignment
1 GND
2 not connected
3 Vbat (8 to 30 V DC)
4 Shield (DIN rail potential)
1Capacitive connection (5 kV) to supply shield (DIN rail potential)

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2.3 Influence on Maximum Bus Length
The PCAN-Repeater DR has a transit delay of 115 ns. This
corresponds to a cable length of 23 m which reduces the maximum
bus length.
Due to the characteristics of the CAN protocol, the maximum bus
length depends on the bit rate.
Bit rate Maximum bus length Bus length with repeater
1 Mbit/s 40 m 17 m
500 kbit/s 110 m 87 m
250 kbit/s 240 m 217 m
125 kbit/s 500 m
50 kbit/s 1.3 km
20 kbit/s 3.3 km
10 kbit/s 6.6 km
5 kbit/s 13.0 km
Using these bit rates, the
transit delay of a repeater
can be disregarded.
The listed values have been determined on the basis of an idealized
system and can differ from reality.
Note: The PCAN-Repeater DR cannot be used to extend the
length of a CAN bus beyond the maximum bus length.
2.4 CAN Termination
The termination for each CAN port can be separately activated with
switches on the board. At delivery, the termination is switched on.
A High-speed CAN bus (ISO 11898-2) must be terminated on both
cable ends with 120 Ohms, otherwise, malfunctions will arise. Both
CAN bus segments that are coupled by the PCAN-Repeater DR must
be fully terminated.

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Proceed as follows to change the termination settings:
1. Before opening the PCAN-Repeater DR, disconnect it from
the power supply.
2. Open the plastic casing by slightly pushing the latches on
the front above the CAN connectors and at the bottom
behind the power connector, e.g. with a flat tip screwdriver.
3. Pull out the circuit board including the front part of the
casing.
Switch blocks S1 and S2 for the termination of the CAN ports
4. Change the termination settings for the CAN ports using the
switches on the circuit board (switch blocks S1 and S2). For
a CAN port, both switches of a switch block must have the
same setting.
5. For the assembly of the PCAN-Repeater DR, slide the board
including the front part back into the plastic casing and
press the casing together (the latches click in).

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2.5 Transmission Limitation
Note: Use this function only for special purposes. An in-depth
understanding of CAN bus communication is required.
On delivery of the PCAN-Repeater DR, CAN communication is done
in both directions without limitation.
The transmission of CAN signals can be completely blocked in one
direction. This allows to observe a CAN bus segment without
physical interference.
Note: CAN nodes on the observing CAN bus segment must not
transmit. Therefore, you must activate the listen-only mode for
each of those CAN nodes. Background: If transmission is
limited to one direction, no collision detection can take place
between both CAN bus segments.
Proceed as follows to change the setting for the transmission
direction:
1. Before opening the PCAN-Repeater DR, disconnect it from
the power supply.
2. Open the plastic casing by slightly pushing the latches on
the front above the CAN connectors and at the bottom
behind the power connector, e.g. with a flat tip screwdriver.
3. Pull out the circuit board including the front part of the
casing.

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Switch block S4 for setting the transmission direction
4. Set the transmission direction with switch block S4
according to the following table.
Switch block S4 Transmission direction
CAN 1 CAN 2 Remark
Default setting
(recommended)
CAN 2 is observer
(only for special purposes)
CAN 1 is observer
(only for special purposes)
No communication!
5. For the assembly of the PCAN-Repeater DR, slide the board
including the front part back into the plastic casing and
press the casing together (the latches click in).

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3Operation
3.1 Initial Steps
To integrate the PCAN-Repeater DR into your CAN bus, proceed
as follows:
1. Mount the PCAN-Repeater DR at the appropriate position on
the DIN rail by hanging it in at the top of the rail and
snapping it to the bottom.
2. Connect each of the two CAN ports with the corresponding
CAN bus segment. Make sure that the same bit rate is used
on both CAN bus segments.
3. Connect the PCAN-Repeater DR to a power supply (8 to 30 V
DC).
The PCAN-Repeater DR now forwards the CAN messages 1 to 1.
For operating the PCAN-Repeater DR in a CAN FD bus, there are
notes in Appendix C on page 21.

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3.2 Status LEDs
LED Status Meaning
Error Red flashing once Communication error (error
frames)
Orange on Bit rate detection is executed or a
bit rate could not be detected
Off No CAN communication
Green slow blinking (2 Hz) Bus load up to 19 %
Green quick blinking (4 Hz) Bus load 20 to 49 %
Orange slow blinking (2 Hz) Bus load 50 to 79 %
Traffic
Orange quick blinking (4 Hz) Bus load 80 to 100 %
Power Green on Power supply is present
Note: The Error and Traffic LEDs only work with CAN 2.0 data
traffic.
3.3 Bus Load and Error Indication
In order to be functional, the bus load and the error indication (LEDs
Traffic and Error) require the use of standard bit rates at CAN 2.0
data traffic.
Bus load and error indication
Supported CAN bit rates (kbit/s) 1000, 800, 500, 250, 200, 125, 100, 95.2,
83.3, 50, 47.6, 33.3, 20
Behavior of the indicator function:
The used CAN bit rate is detected automatically. The supported
transmission rates are tried out. During the detection phase, the
Traffic LED is lit orange. The duration of this process depends on
the CAN traffic and on the bit rate being used on the CAN bus
(200 successive CAN messages must have been detected
faultlessly).

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The indication function does not influence the transmission of
CAN messages.
If the indication function detects a significantly increased error
rate, it assumes that the bit rate has changed and re-executes
the bit rate detection.
After switching off the PCAN-Repeater DR and switching it on
again later, the indication function uses the last detected bit rate.

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4Application Examples
This section describes two application examples for the PCAN-
Repeater DR:
Decoupling of Two Bus Segments (below)
Implementation of a Long Stub Line (on page 15)
Note: The PCAN-Repeater DR cannot be used to extend the
length of a CAN bus beyond the maximum distance of two
nodes.
4.1 Decoupling of Two Bus Segments
The PCAN-Repeater DR is used to establish a galvanic isolation
between two bus segments (A and B).
Both new bus segments must each be terminated with two 120-
Ohm resistors. As the PCAN-Repeater DR has already an activated

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internal termination (120 Ohms) on each CAN port, no further action
is required during installation.
4.2 Implementation of a Long Stub Line
The PCAN-Repeater DR is used to implement a long stub line.
Normally, a CAN bus must have a line structure. Stub lines (connec-
tions for nodes on the CAN line) may only be short in order to avoid
a star structure that can affect high-frequency electronic signals.
Since a fully terminated CAN bus C is assumed, the internal termi-
nation for CAN port 1 must be deactivated (activated on delivery,
see section 2.4 on page 7). Because the PCAN-Repeater DR forms
one end of the long stub line, the termination on CAN port 2
remains activated.

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5Technical Specifications
Connectors
CAN 2 x Phoenix connector 4-pin2
Power Phoenix connector 4-pin2
CAN
Specification ISO 11898-2, High-speed CAN
2.0A (Standard format) and 2.0B (Extended format)
Bit rates 5 kbit/s to 1 Mbit/s
Transceiver NXP PCA82C251
Galvanic isolation Up to 5 kV DC or 3.5 kV AC (in accordance with
IEC 60601-1),
between both CAN ports
and between CAN and power supply
Termination 120 Ohm, switchable for each CAN port, activated
on delivery
Transit delay 115 ns (corresponds to about 23 m cable length)
Power supply
Supply voltage 8 to 30 V DC
Current consumption 70 mA at 9 V
30 mA at 24 V
Measures
Size 22.5 x 99 x 114.5 mm (W x H x D)
See also dimension drawing in Appendix B on page
20
Weight 96 g
2Phoenix Contact type MSTB 2,5/4-ST BK - 1756298

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Environment
Operating temperature -40 to +85 °C (-40 to +185 °F)
Temperature for storage
and transport
-40 to +100 °C (-40 to +212 °F)
Relative humidity 15 to 90 %, not condensing
Ingress protection
(IEC 60529)
IP20
Conformity
RoHS EU Directive 2011/65/EU (RoHS 2) + 2015/863/EU
DIN EN IEC 63000:2019-05
EMC EU Directive 2014/30/EU
DIN EN 61326-1:2022-11
Extended interference immunity:
IEC 61000-4-6 (10 V eff.)
IEC 61000-4-3 (20 V/m)

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Appendix A Conformity
A.1 CE Certificate

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A.2 UKCA Certificate

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Appendix B Dimension Drawing
The figure does not show the actual size of the product.