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The Programmable Input/Output Device for the CAN Bus

The CANextender is a programmable input/output device for CAN systems that can be used where analog and digital measurements must be acquired and transmitted to the CAN bus via CAN messages. For this purpose, the CANextender reads in digital and analog signals and evaluates them according to a configuration program created by the user. The configuration program thus specifies via which CAN messages and how often the measurement values are transmitted on the CAN bus.

Features and Advantages:

Features of the CANextender hardware:
I/O interfaces via DB-37 male connectors:

  • 8 voltage inputs: -16 V .. +16 V, 12-bit resolution, increments of 8 mV, precision ± 0.1 %
  • 8 digital switch outputs: 36 V / 0.5 A (Low-Side)
  • 8 digital inputs: 0..36 V (common connections with the digital outputs)

Only CANextender AT:

  • 2 thermocouple inputs: type K (-200 °C .. 1220 °C, ± 3 °C)

Only CANextender AA:

  • 4 voltage outputs: 0 V .. 5 V, 12-bit resolution, ± 0,1 %
  • CAN interface: high-speed (82C251) or low-speed (TJA1054)
  • Automotive-power supply range 8,5 V to 18 V
  • Large operating temperature range: -40 °C.. +70 °C
  • Low power consumption: type 3 W
  • Robust aluminium housing: (185 mm x 105 mm x 35 mm)


Using the configuration software included in the delivery, the CANextender can be configured and controlled via a RS-232 PC serial interface. Various system objects such as variables, timeouts, counters, flags, timers, message rates, and time integrals can be specified. The CANextender can operate in two different operating modes. The current operating mode is determined by whether or not the serial interface cable is plugged in when the device is switched on. The received operating state is displayed on the device's LEDs directly after switching it on.

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