User`s manual

Western Reserve Controls WRC-CANX-xx Series 3
PUB 14.0 User’s Manual
3
• Less than 500 µsec latency
• 4 bi-color (red/green) status LED's
• CE Compliant for WRC-CANX-NEM-xx versions
•EN 55011 Class A
•EN 50082-2: 1994
1.3. Basic Operation
There are two bus connections for each CANX, referred to as Network A and Network B. The CAN
Bus is connected to each side of the CANX and each side receives its power and signals from the Bus on
its respective side. See
Figure 1-3 for a typical application.
Whenever a message is transmitted on the Bus to which CANX is connected, CANX receives the
message on the side where it was initiated and performs a store-and-forward of the message to the other
side. It then transmits the message to the bus on the other side, following the defined bus arbitration rules.
This action is performed for any valid CAN message independent of who generated it or to whom it is
intended.
There is approximately a 75 µsec propagation delay of the message through the CANX.
The CANX is not addressed as a specific device on the Bus and cannot be interrogated by other
nodes. It is transparent to all other nodes on the bus.
Figure 1-3 Typical CANX network configuration
1.4. Ordering Options
Several options are available, depending upon which bus network is used and which package choice
is desired.
Network B
A
B
PS PS
CAN-Bus
Master
T T T T
Network A
Terminating resistor requirements indicated by “T”
WRC-CANX
I/O Nodes I/O Nodes