CTrans OL acts as a transceiver for protocol transparent transmission of CAN signals between copper based sections via an optical fibre.
Several technical improvements can be obtained by optical transmission of CAN signals, such as secure separation of high voltages and insensitivity to electromagnetic perturbation. Furthermore the transparent transmission of CAN signals with CTrans OL preserves the main benefits of CAN, such as error correction and priority driven bus access.
Like repeaters Ctrans OL can be used to build flexible wiring topologies. Star and tree structures as well as stub lines can be realized. The integrated error supression reduces the influence of faulty segments onto intact sections.
For the optical connection cost effective PMMA fibres with clamped connection and 62,5µm multimode glass fibres with SMA and ST connectors are supported. Depending on the type of fibre a wiring distance up to 3000m can be achieved.
CTrans OL devices include one CAN segment (marked ‘CAN’) fed to a male and female plug of type D-Sub 9. The plugs carry the CAN signals and the supply voltage, the latter can optionally be fed into a seprarate connector (marked ‘Power’). The following table shows the function of the internally connected CAN interface. The optical connection is provided by a type dependent optical fibre adapter mounted on an additional connector (marked ‘Opto Link’).
| Pin | Characterization CAN connector | Characterization power connector | Function |
|---|---|---|---|
| 2 | CAN_L | – | CAN_L bus line (dominant low) |
| 3 | GND | GND | Ground line |
| 7 | CAN_H | – | CAN_H bus line (dominant high) |
| 9 | V+ CAN | V+ CAN | Power supply 24V |
| Parameter | Minimum | Maximum | Unit |
|---|---|---|---|
| Storage temperature | - 20 | + 80 | °C |
| Operating temperature | 0 | + 60 | °C |
| Supply voltage | - 100 | + 35 | V |
| Voltage on bus connections | - 30 | + 30 | V |
| Admissible power consumption (at 60°C) | – | 2000 | mW |
| Any (also temporary) stress in excess of the limiting values may cause permanent damage on CTrans OL and other connected devices. Exposure to limiting conditions for extended periods may affect the reliability and shorten the life cycle of the device. | |||
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Current consumption (running idle) | – | 30 | – | mA |
| Current consumption (250kBit/s, 100% busload) | – | 40 | – | mA |
| Supply voltage | 10 | 24 | 30 | V |
| Propagation delay (per pair of devices) | – | 125 | 300 | ns |
| All values, unless otherwise specified, refer to a supply voltage of 24V and an environmental temperature of 20°C. | ||||