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CAN Bus Repeater

CRep S4

The CRep S4 4-channel CAN Bus repeater transmits and amplifies CAN signals transparent to the CAN protocol. CRep S4 allows the design of flexible wiring topologies, with star and tree structures and stub lines easily realized.

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CRep S4 User Manual [doc rev 1.2]


Key Product Features

  • Protocol transparent 4-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

CRep S4 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 S4 repeater is used, the effect of the propagation delay through the repeater must be included in the cable length calculation.

For a CRep S4 repeater, the typical and maximum propagation delays is 130ns and 200ns, 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 36m.

Technical Data

Layout and Connection

The CRep S4 device includes 4 CAN segments, wired by terminal blocks with 3 clamps. The power supply of CRep S4 is separately wired by a terminal block with 2 clamps.

Pin Name Description
1 CAN_H CAN bus line circuit 1 (dominant high)
2 CAN_L CAN bus line circuit 1 (dominant low)
3 GND Ground line

The following table shows the terminal assignment of the power connector:

Pin Name Function
1 Power + Positive supply +24V
2 Power - Ground

Limiting Values

Parameter Minimal Maximal Unit
Storage temperature -40 +90 °C
Operating temperature 0 +60 °C
Supply voltage -100 +35 V
Voltage on signal lines -30 +30 V
Maximum power consumption (at 60°C) - tbd 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) - 26 - mA
Current consumption (250kBaud, 100% busload) - 65 - mA
Supply voltage 19 24 30 V
Propagation delay - 130 200 ns

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