(under construction)

Description

The WiCAN bridge & concentrator connects the physical CAN-bus to a proprietary 802.15.4-based 2.4GHz radio network. Such a network can consist of multiple bridges in order to join two or more CAN-bus segments to each other. Additionally these devices function as the coordinator/concentrator and physical CAN-bus gateway for our WiCAN wireless CANopen-based sensor- and measuring devices.

Wireless CAN-bus bridge & concentrator

Functionality

  • Wireless bridge for CAN-bus data
  • Operates as CANopen® device with device monitoring & configuration and SYNC regeneration
  • Transparent for J1939 or other 29-bit CAN applications
  • Supports more than 100 nodes in the wireless domain
  • Configuration via CANopen or using PC application via (internal) micro-USB port
  • Internal button activates radio association; if no 'coordinator' is found, then it becomes the coordinator. Otherwise it pairs when the found coordinator.
  • Possibility for branding or custom firmware with specific behavior

Network functions (via our gateway)

  • Stream status & power level via JSON
  • View status directly via HTML, no cloud needed
  • Logging to micro-SD card
  • Node-ID assigned via serial number
  • Remote configuration & firmware update

In a given wireless CAN network, one device is the coordinator. The coordinator manages the wireless network and can also be used to automatically apply the coordinator's CAN-bus parameters to other bridges in the network.

Each of the bridge devices contains a CANopen implementation for the purpose of settings and monitoring of the remote CAN-bus segment. This function can be disabled for non-CANopen applications.

Specifications

  • IEEE 802.15.4 protocol using XBee technology
  • Globally approved 2.4GHz ISM band
  • Maximum wireless bandwidth ~100kbps
  • Distance 60m indoors, up to 1200m outdoors. Longer distances possible using directional antennas.
  • Large FIFO buffers allow for buffering of bursts on either side
  • Separate priority FIFO helps in preserving timing of messages with ID ≤ 0x100
  • CANopen SYNC-message PLL on receiving devices to reduce radio latency jitter effects
  • Supports LSS node-ID assignment and Fastscan (CiA 305)
  • Supports automatic bit-rate detection between 10kbps and 1Mbps (CiA 801)
  • Up-to-date EDS file generated by and downloadable from the device
  • Supports firmware update via wired or wireless CAN interface, including firmware of the XBee radio module
  • Supports power management & monitoring features (CiA 302-9 + custom)
  • Bus powered Um 7-36VDC, power <500mW
  • 5-pin spring-contact termination for CAN, power and shield
  • Ground and shield individually terminated to enclosure/earth via 1nF class Y1 safety capacitors
  • Aluminium IP65 enclosure 64x58mm, height 35mm
  • Integrated mounting flanges (94mm wide), optionally without flanges
  • M16 brass cable gland entries in sides
  • Antenna (RP-SMA) connection mounted via isolated M16 gland fitting
  • Optional with 5-pole industrial M12 plug connection
  • ATEX intrinsic safety 'ic' (IEC 60079-11), increased safety 'nA' (IEC 60079-15), and dust ignition protection 'tc' (IEC 60079-31)

Plug & Play configuration

Plug&play operation

Out of the box, the device is configured to switch to OPERATIONAL state autonomously. The node-ID is programmed to 1 for a coordinator node and to 2 for a 'slave' node. Their bit-rate is preset to 250kbps. The automatic bit-rate detection kicks in when bus errors occur before any valid messages have been received. After listening for all known bit-rates with no success, it reverts to the preset value and stays there.

  • Node-ID preset at 1 for coordinator and 2 for bridge or end-device
  • Bit-rate predefined to 250kbps
  • Automatic switch to NMT state OPERATIONAL
  • TPDO1 (CAN-ID 0x180+$NODEID) sends RSSI and radio error counter upon change or every minute
  • All defaults can be changed using SDO or LSS configuration

Wireless performance & limitations

Connecting CANopen devices over a wireless link strips some of the reliability and ruggedness features of the CAN bus protocol. Additionally, there are bandwidth limitations that are less easily defined than with a wire-line approach. Use of more than 2 bridge devices in a network results in multicast transmissions, which decreases effective bandwidth proportionally to the number of bridges. When the wire-line feed bit-rate and message rate exceed the available RF bandwidth, increased message latency may occur and ultimately message loss.

CANopen

ATEX

Availability

Item: Description: Status: Price: Action:
80-951-201Wireless CAN-bus Bridge & concentratorPreorder only€ 265 ex VAT
80-951-301Wireless CAN-bus Bridge & concentrator with M12 CANopen male connectorPreorder only€ 275 ex VAT
'CANopen' is a registered trademark of CAN in Automation (CiA)
'XBee' is a registered trademark of Digi International Inc.