User`s manual

Western Reserve Controls WRC-CANR-DF-DN User’s Manual
PUB 14.2 Series 4
2
* Up to 2.2 km fiber lengths
* CAN 2A and 2B, and remote frame, support
* Autobaud operation for DeviceNet baud rates
* Either unit in a pair can Autobaud from the other units defined baud rate
* Jumper-selectable terminating resistor on-board the CANR
* Eliminates the distinction between WRC’s earlier version Type 1 and Type 2 CANR’s
1.2. Features
The WRC-CANR-DF-DN and WRC-CANR-DF-SM have the following features:
* Extends CAN-Bus cable lengths - trunk line or drop lines
* Expands the usable applications for CAN-Bus systems
* Allows operation at higher speeds for specific distances
* Provides superior electrical interference protection to copper cables
* Operates at 9.6K, 10K, 20K, 40K, 50K, 100K 125K, 250K, 500K, 800K and 1M baud
* Switch-selectable Autobaud or fixed baud rate operation
* Automatic speed selection - no configuration required
* Isolates the two sections of the copper bus
* Transparent to the Master and Slave devices on the bus
* No address selection needed
* No configuration parameters
* DeviceNet; SDS; CANopen; J1939; CAN, V2.0, Part A and Part B compatible
* Powered from the 24Vdc supplied by bus network or the user
* Sealed NEMA-4X enclosure
* Standard round, mini-style connector with male pins for copper cable
* For WRC-CANR-DF-DN: Standard Fiber Optic ST female connector, 62.5/125
µ
m technology
* For WRC-CANR-DF-SM: Standard Fiber Optic ST female connector, 9/125
µ
m technology
* Standard CAN chips manage bus error detection
* Standard CAN chips handle message bus contention
* Less than 100
µ
sec latency
* Jumper-selectable termination built in on cable side
* 4 bi-color (red/green) status LEDs
* 2 green fiber transmit and receive LEDs
1.3. Basic Operation
Two CANR-DF units are included in an order and both are required for each application – both
units are identical. It does not matter which 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.
Figure 1-1 shows 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.