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CAN Repeaters
Repeaters are used to establish the physical coupling of two
or more segments of a CAN bus system. They can be used to implement tree
or star topologies as well as long spur lines. In addition, network
segments can be electrically decoupled using a galvanically isolated
repeater.
The lines coupled by the repeater are independent electric
segments that can be optimally terminated in terms of signals. In this way
topologies can be implemented that are not possible with a pure line of
the bus due to electrical reflections.
The division of a CAN system into several subsystems
connected via CAN repeaters also allows the maximum number of bus
subscribers defined by the transceiver output capacities to be
increased.
As messages are not addressed in CAN, the repeater logic has
to translate the signals of the segment received into the other signals in
each case and ensure that the input signals are not back-coupled. In terms
of signals, the repeater corresponds to a line with relevant delay time.
It cannot therefore be used to extend a CAN system.
Using repeaters does not influence the real-time behavior of
a system, because in terms of transmission behavior it corresponds to a
network that only consists of lines.
Another area of application of repeaters is the coupling of
different physical CAN layers, e.g. by means of high/low-speed repeaters
or optical repeaters.
The repeaters offered by IXXAT have an additional monitoring
function. Connected network segments that are disturbed by permanent
dominant levels, are detected and automatically disconnected, thus
enabling the remaining network to continue functioning normally. After the
fault has been eliminated, the operation of a disconnected segment is
detected and the segment can automatically be reconnected to the
network.
IXXAT also offers the repeater technology for licensed
integration in customer hardware. |
Conventional bus structure
Signaling distance between
two furthest nodes (1/9) is 220 metres
Extended structure with spur line
Signaling distance
between two furthest nodes (1/6 or 6/9) is 140 metres |
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CAN Bridges and Gateways
CAN bridges and CAN gateways are infrastructure
components with which complex network structures can be implemented.
CAN bridges can connect CAN networks of
different bit rates or protocols with each other. They are based on the
store-(modify)-forward principle, where CAN messages are received by a
sub-network and then transmitted in the other sub-network.
Translation and filter rules can also be used,
by means of which, for example, a protocol adaptation can be carried out
between the sub-networks. A bridge can therefore also provide simple
gateway functions.
Compared to the CAN repeater, the CANbridge
enables the enlargement of the maximum network size, so that the
sub-systems work fully self-sufficiently with regard to bus arbitration.
CAN sub-networks connected by bridges are independent of each other in
terms of their real-time behavior and are to be regarded as independent
networks.
CAN-bridges are suited to creating hierarchical
networks by transferring only the information to the connected sub-network
via bridges which are relevant for the sub-network. The bridge function
can be executed with the aid of other transmission systems. For example,
the CAN-Ethernet-CAN bridge is connected via two Ethernet-TCP/IP gateways
which enable connection to remote CAN networks.
As an extension to the CAN bridges, CAN gateways
enable access to CAN networks via other communication systems. The
protocols of the connected bus systems are mapped in the other
communication model in each case.
In this way, for example, devices with only one
serial port can be connected to CAN/CANopen networks via CAN/CANopen-RS232
gateways. Gateways can also provide remote accesses to CAN networks. The
CAN-TCP/IP gateway, for example, thus enables worldwide access to the CAN
network, e.g. for diagnosis and service purposes. |
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Overview of IXXAT CAN topology products
Click on the name of the product for more
information: |
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CAN-Repeater -
ISO/IS 11898-2 CAN Repeater (with Low-Speed Option)
The CAN Repeater is used for the galvanic isolation of two
segments of a CAN network, and for creating star or tree topologies. One
special feature of the Repeater is that it can separate a defective
segment from the rest of the network, so that the remaining network can
continue working. After elimination of the defect, the segment is switched
into the network again.
As an option, the Repeater can be equipped
with a low-speed bus interface according to ISO/IS 11898-3. This allows
operation of the Repeater as a high/low-speed converter. Its galvanic
isolation isolates both CAN segments against each other as well as against
the power supply.
| Display |
Transmit (2 green LEDs), defective segment
(2 red LEDs) |
| CAN bus
interface |
ISO/IS 11898-2, Terminals (CAN-High,
CAN-Low, CAN-GND) Both CAN lines are isolated from the power supply
DC/DC converter and against each other by a galvanic isolation. CAN
termination resistors are integrated (can be disabled). |
| Baudrate |
Up to 888 kbps |
| Delay |
150 ns (translates into ~30 m (~90ft.) bus
length) |
| Power
supply |
9-35 V DC, 3 W typ., through
terminals |
| Temperature
range |
-20 ºC ... +70 ºC |
| Housing,
Size |
Plastic enclosure, 110 x 75 x 22
mm | |
CAN-CR200 -
Modular ISO/IS 11898-2 CAN Repeater
The CAN-CR200 is used for the galvanic isolation of two
segments of a CAN network and for creating star or tree topologies.
Several CAN-CR200 can be connected to a CAN-hub via the integrated
backbone bus. One special feature of the Repeater is the automatic
recognition and separation of a defective segment from the rest of
the network so that the remaining network can continue working. After
elimination of the defect, the segment is switched into the network
again.
The galvanic isolation isolates the CAN segments
from each other as well as from the power supply.
| Display |
Transmit and defective segment (three duo
LEDs), Power (one LED) |
| CAN bus
interface |
ISO/IS 11898-2 with CAN choke. Two Sub-D9
connectors and one backbone bus. CAN 1, CAN 2, backbone bus and
power supply are galvanic isolated against each other. CAN
termination resistors are integrated (can be disabled). |
| Baudrate |
Up to 888 kbps |
| Delay |
200 ns (corresponds ~40 m (~120ft.) bus
length) |
| Power
supply |
9-32 V DC, 1.5 W typ., through
terminals |
| Temperature
range |
-20 ºC ... +70 ºC |
| Housing,
Size |
Plastic enclosure, 22.5 x 100 x 115
mm |
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CAN-CR220 -
ISO/IS 11898-2 CAN Repeater with 4 kV Galvanic
Isolation
The CAN-CR220 is used for the galvanic isolation of two
segments of a CAN network and offers a very high galvanic isolation of 4
kV, allowing it be utilized in medical applications. One special feature
of the Repeater is the automatic recognition and separation of a
defective segment from the rest of the network so that the remaining
network can continue working. After elimination of the defect, the segment
is switched into the network again.
The galvanic isolation isolates
the CAN segments from each other as well as from the power
supply.
The CAN-CR220 is tested according DIN/EN 50178 (DIN VDE
0160: 1988-05 and DIN VDE 0160/A1: 1989-04).
| Display |
Transmit and defective segment (three duo
LEDs), Power (one LED) |
| CAN bus
interface |
ISO/IS 11898-2 with CAN choke. Two Sub-D9
connectors. CAN 1, CAN 2 and power supply are galvanic isolated
against each other. Galvanic isolation 4 kV/1 second, 2.5 kV/60
seconds. CAN termination resistors are integrated (can be
disabled). |
| Baudrate |
Up to 888 kbps |
| Delay |
200 ns (corresponds ~40 m (~120ft.) bus
length) |
| Power
supply |
9-32 V DC, 1.5 W typ., through
terminals |
| Temperature
range |
-20 ºC ... +70 ºC |
| Housing,
Size |
Plastic enclosure, 22.5 x 100 x 115
mm |
Product Announcement
- please call for
availability
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FO-Repeater -
Converter from ISO/IS 11898 to fiber optic
cable
The FO Repeater is used for the conversion of the
CAN-signal from copper wire (ISO/IS 11898-2) to fiber optic cables.
Complete isolation and protection against EM-influences can thus be
achieved. In addition, special topologies, star or tree, can be created
with the Repeater.
One special feature of the Repeater is that it
can separate a defective segment from the rest of the network, so that the
remaining network can continue working. After elimination of the defect,
the segment is switched into the network again.
The Repeater is
available for plastic (POF) or for glass fibre (please indicate which you
require when ordering).
| Display |
Sending (2 green LEDs), defective segment (2 red
LEDs) |
| CAN bus
interface |
ISO/IS 11898-2, Terminals (CAN-High, CAN-Low,
CAN-GND). CAN termination resistors are integrated (can be
disabled). |
| FOC
connection |
2 x F-SMA terminals for duplex line (Glass 50/125 µm
duplex; POF 980/1000 µm duplex) |
| Baudrate |
Up to 888 kbps |
| Power supply |
9-35 V DC, 3 W typ., through terminals |
| Temperature
range |
0 ºC ... +60 ºC |
| Housing, Size |
Plastic enclosure, 110 x 75 x 22 mm (without FO
connector) | |
CANbridge -
Configurable CAN/CAN Gateway
The CANbridge allows the coupling of two CAN networks,
including networks with different bit rates. Unlike a CAN-Repeater, which
only translates the electric signals, the CAN messages are received
completely by the CANbridge and then sent to the other CAN network under
consideration of filter and conversion rules (Store-Forward principle).
With the aid of conversion rules (gateway tables), CAN messages can be
filtered or forwarded under another identifier. With these mechanisms, the
bus load can be reduced in the individual networks by only
sending messages to the other network which are of
interest.
The CANbridge has a powerful 16-bit microcontroller that
can process bursts at higher data rates without message loss. LEDs
show the current status of the coupled networks.
The CANbridge is
configured via serial interface with a convenient Windows program. The
configuration of the CAN-interfaces, setting of the operating modes and
the filter- and conversion tables are saved on the bridge.
The
CANbridge is available in three different versions: as an industrial
version in a top hat rail housing or in a robust metal housing and as an
automotive version in a robust metal housing.
| Microcontroller |
Fujitsu MB90F543 |
| Memory
extension |
128 k Flash on-chip, 6 k RAM on-chip (optional 256 k
externes SRAM), 256 Bytes I2C EEPROM |
| CAN
controller |
2 x CAN on-chip, 11-/29-Bit Identifier CAN 2.0A,
2.0B |
| CAN bus
interface |
2x ISO 11898-2 (High Speed),as an option
electrically isolated or 1x ISO 11898-2 and 1x ISO 11898-3
(low-speed) |
| Serial
interface |
RS232 for device configuration |
| Voltage
supply |
9-36 V (Industrial Version), 7-16 V
(Automotive Version), 1.5 W |
| Temperature
range |
-20 ºC ... +70 ºC |
| Certification |
CE, FCC |
| Housing,
Size |
Robust metal housing approx. 100 x 85 x 32 mm or
plastic top hat rail housing approx. 110 x 75 x 22
mm | |
CAN@net II/Generic -
CAN-Ethernet Gateway or CAN-Ethernet-CAN Bridge
Gateway mode
In the gateway mode the CAN@net
II/Generic is connected to a PC or to a controller platform via TCP/IP.
The application program on the host communicates via a standard TCP/IP
socket and uses a simple ASCII protocol. The CAN@net II/Generic therefore
provides simple, flexible access to CAN systems via a LAN or via the
Internet.
Bridge mode
Using 2 CAN@net
II/Generic, a CAN-Ethernet-CAN bridge can be implemented. This bridge
enables the exchange of CAN messages between two CAN systems, where filter
tables can be defined.
Configuration and firmware
update
The configuration of the TCP/IP parameters can be
performed using an easy to handle PC tool with automatic device
detection. The configuration of the bridge functionality and the CAN
communication is supported by an implemented webserver.
| PC bus interface |
10/100 Mbit/s Ethernet (10-Base T/100-base T),
Autodetect, RJ45 connector |
| IP address
allocation |
DHCP, via PC tool |
| Microcontroller |
Freescale MCF5234, 150 MHz |
| Memory extension |
8 Mbyte DRAM, 4 Mbyte Flash |
| CAN controller |
1 x Philips SJA1000 and 1 x internal |
| CAN bus
interface |
ISO/IS 11898-2, Sub D9 galvanically decoupled
(500V) |
| Current
supply |
9-32 V DC, 3 W |
| Temperature
range |
-20 ºC ... +70 ºC |
| Certification |
CE, FCC |
| Housing, Size |
Plastic housing for top hat rail mounting,
approx. 22,5 x 100 x 115 mm | |
CANblue/Generic -
CAN-Bluetooth-CAN Bridge or CAN-Bluetooth Module with ASCII
Protocol
Bridge Mode
he bridge mode allows the user to
set-up a CAN-Bluetooth-CAN bridge by using two CANblue/Generic devices.
Message exchange occurs on layer 2 and is transparent. The CANblue/Generic
can also be used in systems that work with CANopen, DeviceNet or
customer-specific protocols. Filters for CAN identifiers can be stored in
the devices for data exchange via Bluetooth. By using more than two
CANblue/Generic devices the coupling of the devices can be made
dynamically. The maximum distance between the CANblue/Generic devices is
100m, depending on environmental conditions.
ASCII
Protocol Mode
In ASCII protocol mode, functions for
transmitting and receiving CAN messages and for configuring the
CANblue/Generic are available to the user based on simple ASCII
commands. The CANblue/Generic is ideal for "non-Windows" systems or
embedded platforms that will be connected wirelessly to CAN.
| Bluetooth interface |
Bluetooth specification v1.1 +20dBm (100m
range) |
| Microcontroller |
Infineon 161 |
| Memory extension |
256k Flash, 128k RAM |
| CAN controller |
One Philips SJA 1000 |
| CAN bus interface |
ISO/IS 11898-2 (high-speed) and
ISO/IS
11898-3 (low-speed), switchable,
Sub D9 plug according to DS 102,
electrically isolated |
| Current supply |
9-30V DC |
| Temperature range |
0 ºC ... +55 ºC |
| Certification |
CE, FCC |
| Housing, Size |
Sturdy metal housing, approx. 85 x 72 x 35
mm (W/H/D) | |
CANmodem/CANopen -
For remote access to CANopen systems via telephone
line
CANmodem is an intelligent gateway that allows remote access
to CANopen systems via a conventional AT compatible modem.
The
programming interface for Windows 2000/XP (API) provides functions for
transmitting and receiving SDO messages as well as for configuration of
the CANmodem. PC-based service and monitoring programs can simply access
the CANmodem by means of the API via a telephone dial-up
connection.
The CANmodem is a full CANopen node and has an object
directory, two server SDOs and 127 client SDOs. Data of any
length can be read and written via the client SDOs (segment size via
Modem is 231 bytes). The module can act as a heartbeat producer and
as a heartbeat consumer, can monitor up to 16 devices and transmit
corresponding events in the CANopen network such as NMT events or
heartbeat events. In addition, transmission and reception of any
layer 2 messages is possible. This function can be used for transmitting
and receiving any PDOs or for using the CANmodem with any CAN
protocol.
In the event of service, many SDO accesses to the
individual devices occur. The API not only allows SDO accesses to be
initiated individually, but a whole list of SDO accesses, to be initiated,
can be transmitted to the CANmodem. This list is then processed locally by
the CANmodem and the result is then returned. With many SDO accesses, the
propagation time via the telephone line plays a minor role.
The
CANmodem can be connected to a conventional external AT-compatible modem
via the full-duplex RS232 interface or directly to the PC. Communication
occurs via a serial protocol based on the HDLC standard. For modem
adaptation, a configurable init string can be saved in the object
directory.
Connection between the PC and the CANmodem is made by
means of a safe callback procedure. For this, the caller gives the
CANmodem his callback number, which is checked by the CANmodem based on a
white list. If the relevant number is entered in the white list, the modem
calls the caller back and starts an authorization phase based on the CHAP
protocol. After successful authorisation, the PC application can run all
functions on the CANmodem.
| Microcontroller |
Fujitsu MB90F543 |
| Memory extension |
128 kB FLASH, 256 kB RAM |
| CAN controller |
Fujitsu on-chip CAN controller |
| CAN bus
interface |
High-Speed ISO/IS 11898-2, galvanically
isolated |
| Baudrate |
Up to 1 MBit/s |
| Serial
interface |
Full-duplex RS232 interface |
| Voltage
supply |
9 - 36 V DC, 1.5 W |
| Temperature
range |
-20 ºC ... +70 ºC |
| Certification |
CE, FCC |
| Housing, Size |
Plastic housing for hat-rail assembly, 100 x 75 x 20
mm | |
CANlink II -
RS232-CAN Converter
With the CANlink II devices with a serial port can be connected to the
CAN bus.
Two modes are available for use in CAN and CANopen
networks.
In the CAN mode (layer 2) the received CAN data are
transmitted transparently to the RS232 interface. Data sent by means of
RS232 are packed in CAN telegrams and transmitted. One configurable
identifier each is available for transmission and reception.
In
the CANopen mode the CANlink works as a CANopen subscriber, where the
serial data is saved as a bytestream object in the manufacturer-specific
object dictionary range.
Supported CANopen features
are:
- 1 server SDO expedited, non-expedited, no CRC check
- 1TX PDO static mapping
- 1 RX PDO static mapping
- Emergency
message
- Heartbeat producer
- NMT slave
The communication
interfaces and modes are configured with a configuration file which is
saved on the device with an upload program.
The CANlink II is
available in two housing versions, a plastic housing for top hat rail
assembly or as a table-top device in a sturdy aluminum housing.
| Microcontroller |
Fujitsu MB90F543 |
| Memory extension |
128 k Flash on-chip, 6 k RAM on-chip (optional: 256
k externel SRAM), 256 Bytes I2C EEPROM |
| CAN controller |
1 x CAN on-chip, 11-/29-Bit Identifier CAN 2.0A,
2.0B |
| CAN bus
interface |
1x ISO 11898-2 (High Speed), optional: galvanically
isolated |
| Serial port |
RS232 (600, 1200, 2400, 4800, 9600,19200, 38400,
57600, 115200 bits/s) |
| Power supply |
9-36 V, 1.5 W |
| Temperature
range |
-20 ºC ... +70 ºC |
| Certification |
CE, FCC |
| Housing,
Size |
Sturdy metal housing approx. 100 x 85 x 32 mm or
plastic top hat rail housing approx. 110 x 75 x 22
mm | |
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Powerful LIN-CAN-Gateway
The LIN-CAN gateway is a
universal device for the analysis of LIN networks via the CAN bus and for
the emulation of LIN slave or master modules. In addition, the device can
be used as a LIN-PC interface for PC-based configuration and monitoring
software or for PC-supported LIN device development.
The LIN-CAN
Gateway supports four operating modes:
- LIN-CAN Gateway
-
LIN-Slave Emulation
- LIN-Master-Slave Emulation
- LIN-PC
Interface
| Microcontroller |
Fujitsu MB 90FS43 |
| Interfaces |
1x CAN ISO 11898-2 High-Speed,
1x CAN ISO 11898-3
Low-Speed,
1x LIN, 1x RS232 |
| Memory
extension |
6 k RAM data memory, 128 Kbyte Flash |
| Extras |
Configurable Sleep mode with Wake up via CAN, LIN or
RS232 |
| Power
supply |
7 V ... 16 V DC, 1.5 W |
| Temperature
range |
-20 ºC ... +70 ºC |
| Certification |
CE, FCC | |
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