3. Configuration of the CAN-CBM-Bridge/2 - esd electronics, Inc.

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This page is intentionally left blank. Connector Assignments CAN-CBM-BRIDGE/2 Hardware Rev. 1.2 23
24 CAN_H CAN_L CAN_GND Wiring 5. Correctly Wiring Electrically Isolated CAN Networks Generally all instructions applying for wiring regarding an electromagnetic compatible installation, wiring, cross sections of wires, material to be used, minimum distances, lightning protection, etc. have to be followed. The following general rules for the CAN wiring must be followed: 1. 2. 3. A CAN net must not branch (exception: short dead-end feeders) and has to be terminated by the wave impedance of the wire (generally 120 W ±10%) at both ends (between the signals CAN_L and CAN_H and not at GND)! A CAN data wire requires two twisted wires and a wire to conduct the reference potential (CAN_GND)! For this the shield of the wire should be used! The reference potential CAN_GND has to be connected to the earth potential (PE) at one point. Exactly one connection to earth has to be established! 4. The bit rate has to be adapted to the wire length. 5. Dead-end feeders have to kept as short as possible (l < 0.3 m)! 6. 7. 8. When using double shielded wires the external shield has to be connected to the earth potential (PE) at one point. There must be not more than one connection to earth. A suitable type of wire (wave impedance ca. 120 ±10%) has to be used and the voltage loss in the wire has to be considered! CAN wires should not be laid directly next to disturbing sources. If this cannot be avoided, double shielded wires are preferable. Wire structure Signal assignment of wire and connection of earthing and terminator Shielded wire with transposed wires 120 Ohm CAN wire with connectors DSUB9 connector (female or male) CAN_GND DSUB9 connector (female or male) pin designation (at wire shield) pin designation 1 2 n.c. CAN_L n.c. 1 2 3 3 4 n.c. n.c. 4 5 n.c. n.c. 5 6 7 n.c. CAN_H n.c. 6 7 8 n.c. n.c. 8 9 n.c. n.c. 9 connector case n.c. n.c. connector case n.c. = not connected Figure: Structure and connection of wire CAN-CBM-BRIDGE/2 Hardware Rev. 1.2 120 Ohm earth (PE)
Page 1 and 2: CAN-CBM-BRIDGE/2 Intelligent CAN-Br
Page 3 and 4: CAN-CBM-BRIDGE/2 Hardware Rev. 1.2
Page 5 and 6: 2 This page is intentionally left b
Page 7 and 8: i Overview 1.2 Front View with Conn
Page 9 and 10: i Overview 1.3.3 CAN Interface 6 Nu
Page 11 and 12: 8 Order Information 1.4 Order Infor
Page 13 and 14: Description of Units 2.2 Serial Int
Page 15 and 16: Description of Units 2.4 LED Displa
Page 17 and 18: Configuration Bn:HexIndex By means
Page 19 and 20: Configuration Mm:n:zzzzzzzzzzzzzzzz
Page 21 and 22: Configuration 3.1.2 Change Existing
Page 23 and 24: Connector Assignments 4.2 RS-232 In
Page 25: Connector Assignments 4.4 Power Sup
Page 29 and 30: Wiring Wire Length Optical coupler
Page 31: 28 CAN-CBM-BRIDGE/2 Hardware Rev. 1

3. Configuration of the CAN-CBM-Bridge/2 - esd electronics, Inc.

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