IXXAT CAN Manuals

Copyright IXXAT Automation GmbH CAN Repeater - Manual, Version 3.6 1 CAN-Repeater Manual 1. Description The CAN-Repeater is used for electrical isolation of two segments of a CAN- network, to increase the number of possible CAN nodes, for signal regeneration and for setting up star or tree topologies. A special feature of the IXXAT Repeater is an error detection mechanism with which a defective segment is detected and shut down. The remaining network can thus continue communicating without faults. The segment is reconnected to the network automatically after the problem has been solved. The automatic separation of a defective network segment is made after reception of a permanent dominant level for more than 20 bit times. The separated network will be reconnected after reception of a recessive bit. 2. LEDs The status of the CAN Repeater and the CAN communication lines are indicated by four LEDs mounted at the front of the housing. Transmitting CAN 2 (green) Status LEDs Transmitting CAN 1 (green) CAN 2 segment defect (red) CAN 1 segment defect (red) CAN 1 CAN 2 figure 2-1: Status LEDs of the CAN Repeater Automation GmbH Copyright IXXAT Automation GmbH CAN Repeater - Manual, Version 3.6 2 3. Power and CAN Connectors At the left and right side of the housing are screw connectors for the power supply and CAN line. The pinning of these connectors is as shown in figure 3-1. 1: +9 - 35 V DC 2: GND Power supply First CAN line 6: CAN High 7: CAN Low 8: GND Second CAN line 3: CAN High 4: CAN Low 5: GND figure 3-1: Terminal allocation. Copyright IXXAT Automation GmbH CAN Repeater - Manual, Version 3.6 3 4. Bus termination configuration For optimum communication, the individual electrical CAN-segment is to be terminated at both ends with the impedance of the line. The termination resistors prevent reflections on the line ends and ensure a current path for discharging the dominant to the recessive level. Termination resistors are mounted on the repeater and could be activated or deactivated by soldering jumper. Attention: Open the device only on electrostatic safe areas! Bus termination: Default configuration: Order number 1.01.0064.44000, 1.01.0064.90001: Termination CAN1 and CAN2 Rt=120 Ω active (Soldering jumper closed at „120R Term.“). Order number 1.01.0064.90003: No termination at CAN1 Termination at CAN 2 Rt = 120 Ω active. Order number: 1.01.0064.46000: Termination Rt= 120 Ω at CAN 1 active. No termination at CAN2 allowed (Low Speed- CAN). To close the soldering jumper means to activate the termination resistor of Rt= 120 Ω between CAN_H and CAN_L at the described CAN segment To disable the bus termination open the soldering jumper.