The CRep Opto two-channel Isolated CAN Bus repeater transmits and amplifies CAN signals transparent to the CAN protocol. It allows the design of flexible wiring topologies, with star and tree structures and stub lines easily realized.
Key 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)
- Single or Dual 12-24V power supply
- Rail Mountable
- FCC Class A Verified (use restricted to commercial, business, and industrial environments)
- Backed by 25+ years CAN expertise
Baud Rate Settings & Overall Cable Length Restrictions
CRep Opto 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 with single CRep Opto added When a CRep Opto repeater is used, the effect of the propagation delay through the repeater must be included in the cable length calculation. For a CRep Opto repeater, the typical and maximum propagation delays is 125s and 200ns, respectively. Assuming a 5.5ns/m propagation delay for cable, the maximum propagation delay through the repeater is equivalent to a cable length of roughly 37m (rounding-up). |
| 500kbit/s | 100 – 37 = 63m |
| 250kbit/s | 250 – 37 = 213m |
| 125kbit/s | 500 – 37 = 463m |
| 50kbit/s | 1000 – 37 = 963m |
Specifications
Layout and Connection
CRep Opto devices include 2 CAN segments fed to a male and a female plug of type D-Sub 9. The plugs carry the CAN signals and the supply voltage. The following table shows the function of the internally connected CAN interface.
| Pin | Name | Function |
| 2 | CAN_L | CAN bus line (dominant low) |
| 3 | GND | Ground line |
| 7 | CAN_H | CAN bus line (dominant high) |
| 9 | Vcc | Power supply +24V |
Limiting Values
| Parameter | Minimal | Maximal | Unit |
| Storage temperature | -20 | +80 | °C |
| Operating temperature | 0 | +60 | °C |
| Supply voltage | -100 | +35 | V |
| Voltage on bus connections | -30 | +30 | V |
| Maximum power consumption (at 60°C) | – | 2000 | 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) | – | 30 | – | mA |
| Current consumption (250kBaud, 100% busload) | – | 40 | – | mA |
| Supply voltage | 10 | 24 | 30 | V |
| Propagation delay | – | 125 | 200 | ns |
All values, unless otherwise specified, refer to a supply voltage of 24V and an environmental temperature of 20°C.
