Peak PCAN-Repeater User manual

2-Channel CAN Repeater with
galvanic isolation
User Manual
PCAN-Repeater
V1.0.3

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Products taken into account
Product Name Model Part Number
PCAN-Repeater Industry IPEH-004038
All product names mentioned in this document may be the trademarks or registered
trademarks of their respective companies. They are not explicitly marked by „™“and
„®“.
© 2011 PEAK-System Technik GmbH
PEAK-System Technik GmbH
Otto-Roehm-Straße 69
64293 Darmstadt
Germany
Phone: [phone]
Fax: [phone]
www.peak-system.com
[e-mail]
Document version 1.0.3 (2011-10-10)

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Contents
1Introduction 4
1.1 Properties at a Glance 4
1.2 Prerequisites for Operation 4
1.3 Scope of Supply 5
2Connectors 6
2.1 CAN1 / CAN2 6
2.2 Power Supply 7
3Operation 8
3.1 Operation with Bus Load and Error Display 8
3.1.1 Signal Delay 8
3.1.2 Busload- and Error Display 9
3.2 Status LEDs 10
3.3 CAN Termination 10
3.4 Listen-only Mode 12
3.5 Application Examples 14
3.5.1 Decoupling of two Bus Segments 14
3.5.2 Implementation of a Stub Line 15
3.5.3 Use as a Passive Observer 17
4Technical Specifications PCAN-Repeater 18
Appendix A CE-Certificate 20
Appendix B Dimension Drawing 21

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1Introduction
With the PCAN-Repeater a galvanic isolated connection can be
established between two High-speed CAN busses (ISO 11898-2)
with the same bit rates. The maximum isolation voltage is 5 kV. The
CAN traffic is transmitted 1:1 to the other bus. The device is
designed for use in industrial plants.
1.1 Properties at a Glance
Two High-speed CAN channels (ISO 11898-2)
Galvanic isolation up to 5 kV according to IEC60601-1, between
the CAN channels and between CAN and power supply
Bit rates up to 1 Mbit/s
CAN bus load and CAN error indication with LEDs for standard
bit rates from 20 kbit/s up to 1 Mbit/s
Termination for each CAN channel can be activated separately
Listen-only mode optionally switchable for CAN channel 1 or
CAN channel 2
Plastic casing (width: 22,5 mm) for mounting to a top hat rail
(DIN-EN 60715 TH35)
Extended operating temperature range -40 - 85 °C (-40 - 185 °F)
1.2 Prerequisites for Operation
Voltage supply source in the range of 8 to 30 V DC

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1.3 Scope of Supply
PCAN-Repeater in a top hat rail casing
3 mating connectors for power supply and CAN connectors
Manual in PDF format

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2Connectors
2.1 CAN1 / CAN2
The CAN connectors are located on the upper side of the casing.
Figure 1: Pin assignment CAN
Pin Meaning
1 CAN-High
2 CAN-Low
3 CAN-GND
4 CAN-Shield1
Figure 2: Mating connector CAN
1Capacitive connection (5 kV) to supply shield (top hat rail potential)

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2.2 Power Supply
The connection for the power supply is located on the lower side of
the casing.
Figure 3: Pin assignment Power
Pin Meaning
1 GND
2 not connected
3 Vbat (8 - 30 V DC)
4 Shield (top hat rail potential)
Figure 4: Mating connection Power

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3Operation
3.1 Operation with Bus Load and Error
Display
Do the following to install the PCAN-Repeater into your CAN
network:
1. Mount the PCAN-Repeater at the appropriate position on the
top hat rail by placing it at the top of the rail and snapping it
to the bottom.
2. Connect each of the two CAN ports with the corresponding
CAN network. Note that the two CAN busses must have the
same bit rates.
3. Connect the PCAN-Repeater to a suitable power supply
(8 - 30 V DC).
4. The PCAN-Repeater now forwards the CAN messages 1 to 1.
3.1.1 Signal Delay
The PCAN-Repeater has a transit time delay of 115 ns. This
corresponds to a cable length of 23 m. Therefore, you should
consider the dependence of the maximum length of a CAN bus on
the bit rate at the installation of the repeater. The following table
shows the maximum possible CAN bus length at different bit rates:

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Bit rate 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 477 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
For small bit rates,
the delay of the
repeater can be
neglected
The listed values have been calculated on the basis of an idealized
system and can differ from reality
Note: The PCAN-Repeater cannot be used to extend CAN
busses.
3.1.2 Busload- and Error Display
For the bus load and error display the use of standard bit rates is
provided. As soon as the adapter is successfully put into operation
in a network, the adapter runs automatic bit rate detection. As long
as no bit rate is detected and for the duration of the detection the
traffic LED is on, colored orange. After a successful detection the
bus load and errors are displayed with the traffic and error LEDs.
Details can be found in the following chapter.
For the following bit rates, the bus load and error display are
supported:
20 kbit/s, 33.3 kbit/s, 47.6 kbit/s, 50 kbit/s, 83.3 kbit/s, 95.2 kbit/s, 100
kbit/s, 125 kbit/s, 200 kbit/s, 250 kbit/s, 500 kbit/s, 800 kbit/s, 1 Mbit/s

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3.2 Status LEDs
The PCAN-Repeater has three status LEDs that represent the
following conditions:
Upper LED Status Meaning
Error Red flashing Communication error
(error frames)
Middle LED Status Meaning
Orange on Bit rate detection is performed
or no standard bit rate is
detected
OFF No CAN communication
Green slow blinking (2 Hz) Bus load > 0 - 19 %
Green quick blinking (4 Hz) Bus load 20 - 49 %
Orange slow blinking (2 Hz) Bus load 50 - 79 %
Traffic
Orange quick blinking (4 Hz) Bus load 80 - 100 %
Lower LED Status Meaning
Power Green on Power supply is on
Note: The display of the error and traffic LEDs refers always to
the CAN bus that is connected to CAN channel 1 (only relevant
for the listen-only mode).
3.3 CAN Termination
The termination for each CAN channel can be separately activated
by a switch on the board. At delivery of the repeater the termination
is switched on.
The High-speed CAN busses connected to the device must be cor-
rectly terminated, otherwise disturbances could be the
consequence. If a connected CAN bus is completely terminated,

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deactivate the termination on the repeater. If a CAN bus is not
completely terminated, activate the internal termination for the
appropriate channel. Note that a CAN bus always must be
terminated with 120 Ohms at both ends.
Proceed as follows to switch the termination on or off:
Important note: Before opening the adapter unplug the power
supply.
In order to access the board open the casing of the PCAN-Repeater,
by pushing the latch at the top behind the CAN connectors and at
the bottom behind the power connector slightly in, e.g. with a flat
tip screwdriver. Now you can pull out the front part of the casing
with the board.
Figure 5 shows the positions of the respective switches of the
PCAN-Repeater on the board.

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Figure 5: Termination per CAN channel
Change the termination settings for the CAN channels with the
switches on the board. The affiliations and settings are labeled on
the board.
3.4 Listen-only Mode
The listen-only mode is optionally switched on for the CAN channel
1 or the CAN channel 2. If the listen-only mode for CAN-channel 1 is
activated the participants on this bus can receive the messages
from CAN channel 2, but no data (and also no Acknowledge) is
transferred from CAN channel 1 to CAN channel 2. At delivery of the
PCAN-Repeater the listen-only mode is switched off.
Note: The listen-only mode should be enabled only for one
CAN channel. If both CAN channels are running in listen-only
mode the complete repeater function is disabled.

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Proceed as follows to switch the listen-only mode on or off:
Important note: Before opening the adapter unplug the power
supply.
In order to access the board open the casing of the PCAN-Repeater,
by pushing the latch at the top behind the CAN connectors and at
the bottom behind the power connector slightly in, e.g. with a flat
tip screwdriver. Now you can pull out the front part of the casing
with the board.
Figure 6 shows the positions of the respective switches of the
PCAN-Repeater on the board.
Figure 6: Listen-only mode per CAN channel
To turn on the listen-only mode for the CAN channels, switch S4 to
Listen only for each CAN channel. The settings of the switch are
labeled on the board.

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3.5 Application Examples
3.5.1 Decoupling of two Bus Segments
The PCAN-Repeater is used to establish a galvanic isolation
between two bus segments. If a connected CAN bus is completely
terminated, deactivate the termination on the repeater. If a CAN bus
is not completely terminated, activate the internal termination for
the appropriate channel. Note that a CAN bus always must be
terminated with 120 Ohms at both ends.
With the switchable listen-only mode, the direction of message
forwarding can be set up as required. With a suitable bit rate (see
chapter 3.1.2) the bus load and errors will be displayed with the
traffic and error LEDs.
Figure 7: Decoupling of two CAN busses

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CAN 1 Status CAN 2 Status
Termination On, at a not
terminated CAN bus
Off, at a completely
terminated CAN bus
Termination
On, at a not
terminated CAN bus
Off, at a completely
terminated CAN bus
Listen-only
mode
Optional On or Off Listen-only
mode
Optional On or Off
3.5.2 Implementation of a Stub Line
The PCAN-Repeater is used to establish a physical coupling of two
or more segments of a CAN network. With a tap on a CAN bus a
long stub line can be implemented with several participants.
If the CAN bus B is not completely terminated, activate the internal
termination for CAN channel 1. Note that a CAN bus always must be
terminated with 120 Ohms at both ends. As this tap on the CAN bus
A is not a cable end, deactivate the termination on CAN channel 2.
With the switchable listen-only mode, the direction of message
forwarding can be set up as required. With a suitable bit rate (see
chapter 3.1.2) the bus load and error will be displayed with the
traffic and error LEDs.

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Figure 8: Implementation of a stub line
CAN 1 Status CAN 2 Status
Termination On, at a not
terminated CAN bus
Off, at a completely
terminated CAN bus
Termination
Off, a termination
may only be done
on the cable ends of
a CAN bus
Listen-only
mode
Optional On or Off Listen-only
mode
Optional On or Off

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3.5.3 Use as a Passive Observer
A CAN bus can be terminated and observed by the PCAN-Repeater.
Use the CAN channel 1. Note that the termination of the open CAN
channel (CAN 2) is activated.
Figure 9: Use as a passive Observer
CAN 1 Status CAN 2 Status
Termination On, at a not
terminated CAN bus
Off, at a completely
terminated CAN bus
Termination
On
Listen-only
mode
Off Listen-only
mode
Off

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4Technical Specifications
PCAN-Repeater
Connectors
CAN 2 x Phoenix connector 4-pin
Power Phoenix connector 4-pin
CAN
Specification ISO 11898-2
High-speed CAN (up to 1 Mbit/s)
2.0A (standard format) and 2.0B (extended format)
Transceiver NXP PCA82C251
Galvanic isolation Up to 5 kV, between the CAN channels and
between CAN and power supply
Termination 120 Ohm, switchable for each CAN channel, at
delivery activated
Listen-only mode Switchable for CAN channel 1 or 2
Transmit time delay 115 ns (equals 23 m cable length)
Power supply
Supply voltage 8 - 30 V DC
Power 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 Appendix B
on page 21
Weight 96 g

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Environment
Operating temperature -40 - 85 °C (-40 - 185 °F)
Temperature for storage and
transport
-40 - 100 °C (-40 - 212 °F)
Relative humidity 15% - 90%, not condensing
EMC EN 61326-1:2006-10
EC directive 2004/108/EG
Extended interference resistance:
IEC61000-4-6 (10 V eff.)
IEC61000-4-3 (20 V/m)
Security IEC 60601-1
Ingress protection (IEC 60529) IP20

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Appendix A CE-Certificate