Technical Manual
Wireless CAN Bridge 500 (CB-500LR)
DESCRIPTION:
The Wireless CAN Bridge functions as a wireless link that transfers CAN messages.
Using the Wireless CAN Bridge, nodes on either side of a wireless link can
communicate at a separation of up to 1400 feet. A full 64 node DeviceNet* can be
implemented depending on scan rates and frame density. Since actual CAN messages
are transferred, the Wireless CAN Bridge supports any type of CAN bus standard
including CAN Open and CAN Kingdom.
Terminator Tap
SCANNER
NODE
CAN
BRIDGE
Trunk Line
MOTOR
CONTROL
NODE
Virtual
Trunk
Line
CAN
BRIDGE
Trunk Line
(extended by CAN Bridge)
I/O BLOCK
NODE
SENSOR
NODE
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Technical Manual
Wireless CAN Bridge 500 (CB-500LR)
SPECIFICATIONS:
Functional
1200 frames per second transfer rate (max)
Supports any CAN Bus or DeviceNet* (Bosch CAN 2.0b)
Network baud rate (125K, 250K, 500K)
Five pin male micro connector
16 bit CPU
CPU watchdog
Radio
Typical range of 1400 feet with unobstructed line of sight
2.4 – 2.4835 GHz with 15 channels
FSK modulation
Output power, 3.5 mW
Single heterodyne conversion
Radio complies with FCC Part 15B, no user license required
Configuration Options
Configuration via internal dip switches
Radio link master or slave
Standard versus extended CAN frame formats
Frequency agile enable / disable
Channel (1-15)
Radio retry level
Power Source
Requires SELV power supply at connector “Network”.
See installation section for wiring information.
7-30VDC, 200 mA at 24VDC +/- 5%
Status Indicators
Signal strength
Bus loading
Data Loss Cause
Power
Physical
Size: 3 1/8 X 3 X 6 5/16 Inches
Weight: 1 Lb
DIN rail or panel mount
Sealed enclosure
Operational temperature 0°C to 70°C
Storage temperature -40ºC to 85ºC
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Technical Manual
Wireless CAN Bridge 500 (CB-500LR)
APPLICATION:
The Wireless CAN Bridge provides a frame transfer rate of 1200 CAN frames per
second which is roughly equivalent to a fully loaded 125k baud system. The
effectiveness of the CAN Bridge in any particular application depends on network
loading. The loading on a CAN based network is affected by a number of factors
including: polling rate of the network scanner, node count, change-of-state activity, and
device power up behavior. According to ODVA, 30% loading is recommended for
DeviceNet systems employing change-of-state devices and 80% loading is
recommended for polled DeviceNet systems. Heavily loaded systems increase the
probability that CAN messages will be discarded due to RF bandwidth limitations.
The transfer rate of 1200 fps is based on a typical scenario of less than 1400 feet
separation without significant RF obstacles. The actual transfer rate in any application
is dependent upon the quality of the RF link. Structural components such as steel walls
or decking, earth tunnels, and metal equipment can affect the quality of the RF link.
Also, radiation sources such as other radio systems, high power switching, and
magnetic fields can affect the quality of the RF link. A site assessment should be
performed at any site where a new RF control is to be installed.
The Wireless CAN Bridge provides a point-to-point data transfer in order to achieve the
required throughput over the wireless link. A system requiring multiple wireless links
can accomplish this using multiple pairs of the Wireless CAN Bridge set to different
channels.
The rate at which CAN frames are received and transmitted by the Wireless CAN
Bridge falls within the timing constraints of Bosch CAN Standard 2.0b. While meeting
network requirements for data link and higher levels of communication, the time
required for retransmission may still have an effect on the overall timing of a control
system.
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Technical Manual
Wireless CAN Bridge 500 (CB-500LR)
CONFIGURATION:
Configuration of the Wireless CAN Bridge is accomplished by manually setting switches
inside its enclosure. The CAN Bridge enclosure lid must be removed to access the
configuration switches. Users may only perform the configuration described in this
manual. Changing other switch or trimmer settings may invalidate agency approvals.
To access configuration switches, first, use a flat screwdriver to pry off the two
decorative covers at the right and left ends of the lid. Four pry slots are provided as
shown below. Then unscrew the four screws that attach the lid to the chassis of the
Wireless CAN Bridge using a philips or a flat screwdriver.
SIGNAL
STRONG
POOR
WEAK
The Wireless CAN Bridge has 12 configuration switches arranged in 2 banks S1 and
S2. Each bank contains 6 switches. These switches allow the user to easily customize
the Wireless CAN Bridge to fit the desired application.
OFF ON
1
2
3
S1
4
5
6
LED CONNECTOR
OFF ON
1
2
3
S2
4
5
6
LOADING DATA LOSS CAUSE
HEAVY
MODERATE
NORMAL
LIGHT
BUFFER OVERRUN
RETRY EXHAUSTED
POWER
WIRELESS CAN BRIDGE
RADIO BOARD
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Technical Manual
Wireless CAN Bridge 500 (CB-500LR)
IMPORTANT: Employ ESD precautions to avoid static discharge when touching the
CAN Bridge circuit board. ESD can cause damage leading to catastrophic or
intermittent product failure modes.
The following paragraphs describe each switch setting in more detail. The format Sb:s,
where b is the bank number and s is the switch number within that bank, will be used.
The “as shipped” settings are shown with an asterisk “*”.
The CB-500LR must be reset (power cycled) before switch settings take effect.
Switch S1:1 Selects Node Communication Type for internal radios. A
Radio System must consist of only one Server (master) and
only one Client (slave) per channel. The Server is the
initiator of the radio pair. Before the radios link, the Client
will only listen for a Server and the Server will transmit to find
a Client.
Radio Operation S1:1
Server ON
Client OFF*
Switch S1:2 Reserved.
Switches S1:3,4,5,6 Selects the operating channel. A master/slave pair must be
set to the same channel to operate properly.
Channel S1:3 S1:4 S1:5 S1:6 Freq (GHz)
1*
2 ON ON ON OFF 2.410
3 ON ON OFF ON 2.415
4 ON ON OFF OFF 2.420
5 ON OFF ON ON 2.425
6 ON OFF ON OFF 2.430
7 ON OFF OFF ON 2.435
8 ON OFF OFF OFF 2.440
9 OFF ON ON ON 2.445
10 OFF ON ON OFF 2.450
11 OFF ON OFF ON 2.455
12 OFF ON OFF OFF 2.460
13 OFF OFF ON ON 2.465
14 OFF OFF ON OFF 2.470
15 OFF OFF OFF ON 2.475
15 OFF OFF OFF OFF 2.475
ON
*
ON
*
ON
*
ON
*
2.405*
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Wireless CAN Bridge 500 (CB-500LR)
Switches S2:1,2 Selects the bit rate of the CAN or DeviceNet network.
Switches S2:3 Selects Standard or Extended CAN framing. DeviceNet*
Switches S2:4 Enables frequency agile mode. Units will hop to a clear
Switches S2: 5,6 Selects the number of retries. The radio will retransmit an
Bit Rate (Bits/Sec.) S2:1 S2:2
*
125K
250K ON OFF
500K OFF ON
125K OFF OFF
ON
*
ON
*
uses standard framing. Some varieties of CAN may use
extended framing.
CAN Type
11 bit (Standard CAN)
29 bit (Extended CAN) OFF
S2:3
*
ON
*
channel if errors are encountered (retry count exceeded).
Note: Both units must have this enabled for the feature to
work properly.
Frequency Agile
Enabled
Disabled * OFF *
S2:4
ON
unsuccessful packet the selected number of times before
discarding the packet (or hopping if frequency agile mode is
enabled). Increasing retries may slow the communication
process, but may help reduce discarded packets.
Retries S2:5 S2:6
1 ON ON
16 * ON * OFF *
64 OFF ON
128 OFF OFF
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Technical Manual
Wireless CAN Bridge 500 (CB-500LR)
INDICATORS:
The Wireless CAN Bridge provides three separate groups of diagnostic LED indicators.
The groups are labeled “Signal”, “Loading”, and “Data Loss Cause.” In addition to
these groups, a power indication LED is also provided.
Signal Indicators The signal indicators provide information about the integrity and
robustness of the RF Signal. The three levels may be described as
a function of data throughput.
Data Loss Cause The data loss cause indicators provide information about packets
Strong Indicates the best data throughput. Data packets are
being transferred to the radio at a rate equivalent to
between 100% and 110% of full CAN trunk line
loading (at 125k baud).
Poor Reduced data throughput. Data packets are being
transferred at a rate between 50% and 100% loading
at 125k baud.
Weak Radios are linked, but data throughput is low. Data
packets are being transferred at a rate between 0% to
50% loading.
No Indicators Data rate is zero. No RF link established.
that are discarded due to throughput constraints. Two indications
are provided, Buffer Overrun and Retry Exhausted. Scanner retries
must be set at a level that mitigates data loss at the system level.
Buffer Overrun CAN packets entering the transmit buffer have
overrun the RF link capacity. One or more
CAN messages are discarded.
Retry
Exhausted
No Indicators No data loss.
The configured number of RF transmit retries
has been exceeded. One or more RF packets
are discarded. Note: RF data packets may
contain up to 2 CAN messages.
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Wireless CAN Bridge 500 (CB-500LR)
Loading Indicators The loading indicators show the number of CAN packets that are
being written to the RF transmit buffer. The four levels may be
described as a function of RF bandwidth usage by CAN packets.
Note: Buffer overruns may affect this indicator due to discarded
CAN packets.
Power Indicator The power indicator implies the presence of electrical power. It is a
Heavy 50 % - 100 % of the available bandwidth is
being utilized for CAN messages.
Moderate 35 % - <50 % of the available bandwidth is
being utilized for CAN messages.
Normal 10 % - <35 % of the available bandwidth is
being utilized for CAN messages.
Light 0+ % - <10 % of the available bandwidth is
being utilized for CAN messages.
No Indicators No CAN messages transferred.
hardwired LED that does not indicate the quality of the power
detected.
Power LED On DC Power is On.
No Illumination DC Power is Off.
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Technical Manual
Wireless CAN Bridge 500 (CB-500LR)
INSTALLATION:
The Wireless CAN Bridge can be bolted directly to a control panel, or mounted to a DIN
rail. Remove the two decorative covers at the right and left ends of the lid to access the
mounting holes for direct panel mount (or to attach the DIN rail clips). See the
Configuration section for instruction on removing the decorative covers.
Use adequate material and fasteners when panel mounting the CAN Bridge unit with
consideration to any vibration or shock the unit may experience. Suggested
specifications are listed below.
Panel Fastener
1/2 inch plywood 5/8 x #8 wood screw
1/8 inch aluminum 10-32 machine screw to threaded hole or bolt
1/2 inch plaster board Wall anchor with #6 machine screw
CAUTION: Many types of threadlock will weaken the plastic enclosure of the CAN
Bridge. Instead, use lock washers, or a threadlock that will not damage plastic (such as
Premabond MM115) to secure mounting screws. Do not over-torque panel mounting
screws. Use washers between the CAN Bridge and panel to protect the enclosure and
provide a solid base for tightening mounting screws.
A DIN rail mounting kit is included for attaching the Wireless CAN Bridge to either EN
50-022 or EN 50-035 DIN rails. The DIN rail mounts are attached to the same holes
used for panel mounting.
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Wireless CAN Bridge 500 (CB-500LR)
The Wireless CAN Bridge provides a sealed micro style connector (labeled “Network”)
that complies with the physical standards for DeviceNet* connectors. The CB-500LR
requires a tap to interface into the DeviceNet* trunk line. The pinout for the connector is
shown below. Note: The CAN Bridge 500 requires a SELV power supply with power
output intrinsically limited to under 8 amps at a maximum of 30VDC. If a protective
device is used with a power supply that exceeds this requirement it must be rated to trip
at a current equal to 1000/Vin. Protective devices must be fuses or breakers and must
be non-adjustable, nonautoreset, electromechanical devices.
Network
Male (pins)
1 – Drain (bare)
2 – V+ (red)
3 – V- (black)
4 – CAN_H (white)
5 – CAN_L (blue)
The Wireless CAN Bridge provides factory test functions via a sealed micro style
connector (labeled “Auxiliary”). This connector is not used during normal operation.
43
5
12
5
4
3
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Technical Manual
Wireless CAN Bridge 500 (CB-500LR)
APPROVALS:
The Wireless CAN Bridge has been tested and found to comply with the limits for a
Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed
to provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment.
The Wireless CAN Bridge generates, uses, and can radiate radio frequency energy and,
if not installed and used in accordance with the instruction manual, may cause
interference to radio communications and harmful microwave emissions. To limit
exposure radio frequency radiation, the CAN Bridge should be installed and operated
with a minimum distance of 20 centimeters between the antenna and all persons and
must not be collocated or operating in conjunction with any other antenna or transmitter.
Per Industry Canada RSS210, the installer of this radio equipment must ensure that the
antenna is located or pointed such that it does not emit RF field in excess of Health
Canada limits for the general population. (Consult Safety Code 6, obtainable from
Health Canada’s website at www.hc-sc.gc.ca/rpb.) These simple precautions must be
taken to prevent general population and installation personnel from exposure to RF
energy in excess of specified MPE levels.
Operation of this equipment in a residential environment is likely to cause harmful
interference to other residential devices in which case the user will be required to
correct the interference at their own expense.
Changes or modifications not expressly approved by Matric could void the user’s
authority to operate the Wireless CAN Bridge.
Operation is subject to the following two conditions:
(1) this device may not cause interference, and
(2) this device must accept any interference, including interference that may cause
undesired operation of the device.
The Wireless CAN Bridge has been designed to operate with the antennas listed below,
and having a maximum gain of 16.0 dBi. Antennas not included in this list or having a
gain greater than 16.0 dBi are strictly prohibited for use with this device. The required
antenna impedance is 50 ohms.
Approved Antennas
Manufacturer Part Number Description
Centurion WCR2400SMRP ½ wave coaxial dipole
Terrawave
FAB-CORP RSMADUCK5 full wave coaxial dipole
Cushcraft PC2415N Yagi directional
T24100O10006 w/ N
collinear array
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Technical Manual
Wireless CAN Bridge 500 (CB-500LR)
For technical support, contact:
Matric
2099 Hill City Road
Seneca, PA 16346
(814) 677-0716
www.matric.com
*DeviceNet is a registered trademark of ODVA
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