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CAN Bus Repeater

CRep N

The CRep N 2-channel CAN Bus repeater transmits and amplifies CAN signals transparent to the CAN protocol. CRep N allows the design of flexible wiring topologies, with star and tree structures and stub lines easily realized.

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Download Area

CRepN User Manual (pdf)


Key Product Features

  • Protocol transparent 2-channel CAN repeater
  • Low Propagation Delay
  • Shutdown of erroneous bus segments
  • Choice of Baud Rate: 10/20/50/125/250/500kBaud (selected at order time via factory set inhibit time)
  • Rail Mountable
  • FCC Class A Verified (use restricted to commercial, business, and industrial environments)

CPC-USB/ARM7 USB to CAN Bus Interface


Baud Rate Settings & Overall Cable Length Restrictions

CRepN repeaters are available in a number of baud rate configurations. The maximum CAN cable length, which is the distance between the furthest two nodes in the network, is related to the operating baud rate as follows:

Baud Rate Maximum Cable Length (m)
1Mbit/s 25
800kbit/s 50
500kbit/s 100
250kbit/s 250
125kbit/s 500
50kbit/s 1000

When a CRep N repeater is used, the effect of the propagation delay through the repeater must be included in the cable length calculation.

For a CRep N repeater, the typical and maximum propagation delays is 100ns and 175ns, respectively. Assuming a 5.5ns/m propagation delay for cable, the maximum propagation delay through the CRep N repeater is equivalent to a cable length of roughly 32m.

Technical Data

Layout and Connection

CRep N devices include 2 CAN segments, wired by a terminal block with 8 clamps. Besides the CAN signals the terminal block also carries the power supply for CRep N. The following table shows the terminal assignment.

Pin Name Description
1 CAN1_H CAN bus line circuit 1 (dominant high)
2 CAN1_L CAN bus line circuit 1 (dominant low)
3 GND Ground line
4 GND Ground line
5 CAN2_H CAN bus line circuit 2 (dominant high)
6 CAN2_L CAN bus line circuit 2 (dominant low)
7 GND Ground line
8 +24V Power supply +24V

Limiting Values

Parameter Minimal Maximal Unit
Storage temperature -40 +90 °C
Operating temperature -20 +80 °C
Supply voltage -100 +35 V
Voltage on bus connections -30 +30 V
Maximum power consumption (at 60°C) - 1000 mW

Any (also temporary) stress in excess of the limiting values may cause permanent damage on CRep N and other connected devices. Exposure to limiting conditions for extended periods may affect the reliability and shorten the life cycle of the device.

Nominal Values

Parameter Minimal Typical Maximal Unit
Current consumption (running idle) - 25 - mA
Current consumption (250kBaud, 100% busload) - 35 - mA
Supply voltage 11 24 30 V
Propagation delay - 100 175 ns

All values, unless otherwise specified, refer to a supply voltage of 24V and an environmental temperature of 20°C.