User`s manual

Western Reserve Controls WRC-CANR-DF-DN User’s Manual
PUB 14.1
2
• 2 green fiber transmit and receive LEDs
1.2. Basic Operation
Two CANR-DF units are required for each application – a CANR-DF Type 1 and a CANR-DF Type 2.
These are similar devices that must be used in matching pairs. It does not matter which type is placed in
which position with respect to the network topology or other devices on the network.
There are two bus connections for each CANR-DF, referred to as the Copper Cable Network Side
(Side A) and Fiber Cable Network Side (Side B). The CAN Bus copper cable is connected to side A of the
CANR-DF receives its power from side A.
Error! Reference source not found. for a typical application.
Whenever a message is transmitted on the Bus to which CANR-DF is connected, CANR-DF
receives the message on the side where it was initiated and performs a store-and-forward of the message to
the other side. This action is performed in each direction and is performed for any valid CAN message
independent of who generated it or to whom it is intended.
There is approximately a 75µsec propagation delay of the message through the CANR-DF.
The CANR-DF 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.
1.3. Reference Documents
The following documents are referenced in this User’s Manual
• ODVA DeviceNet Specification Volume I, Release 2.0
• Honeywell Micro Switch Specification GS 052 104, “SDS Smart Distributed System Physical
Layer Specification”, release date 12/8/1994