CAN-Bus Tester 2


The CAN-Bus Tester 2 is a universal diagnosis tool for the start up, analysis, monitoring, troubleshooting and service/maintenance of CAN bus systems. Typical problems which occur during the operation of CAN bus systems such as node failures, faults in the communication or complete standstill of the plant, often have their origins in the physical bus characteristics. The CAN-Bus Tester 2 provides an overview of the signal conditions on the bus, which helps you to locate and rectify frequently occurring error causes instantly. During the installation phase of CAN bus plants the integrated wiring test is especially useful. It is possible to check the bus cabling by using different measurement methods and thus the transfer properties are ensured. You can also perform comparing measurements directly on the running plant over its lifetime and thus prevent standstills.

For long-term monitoring of CAN bus systems GEMAC developed the CANobserver®. Both devices – the CAN-Bus Tester 2 and the CANobserver® – form the CAN-Bus diagnosis family.

  • Bus systems:
  • Baud rates (5 kbit/s ... 1 Mbit/s)
  • Measuring of the signal conditions:
    • General quality level (0 ... 100 %)
    • Disturbance-free voltage range, rising and falling edges
  • Continuous monitoring
    • Bus status, bus traffic load, error frame counter
  • User-friendly protocol monitor (CAN, CANopen)
  • Online trigger (real-time monitoring of the bus for logical and physical errors)
  • Testing of cables (Short-circuits, interruptions, loop resistances, cable length)
  • Straightforward application software:
    • Management of measurements (measurement types, measuring points, measuring times)
    • Comprehensive test record, broad variety of export functions
Fields of Application:
  • Commissioning of CAN bus plants
  • Wiring test, module check
  • Service/maintenance of CAN bus plants
  • Troubleshooting and analysis of the bus characteristics
  • Development of CAN modules
  • Final production testing

General Parameters and Overview of Functions

Use (CAN type)

CAN (ISO11898-2), CANopen (CiA301), DeviceNet (EN 50325-2), SAE J1939

Baud rates

All baud rates according to the particular CAN type; customized baud rates

Quality level

Signal quality level (0 ... 100 %)

Disturbance-free voltage range and edges

0 ... 4 V, resolution 50 mV, edge steepness (in 1/64th of the bit width)

Oscilloscope with message frame analysis

64-fold sampling per bit, 10,240 sample points, zooming, adjustable trigger position,

recording of complete message frames, decoding to used protocol

Bus status

Bus traffic detection (display: dominant, recessive, not defined, bus traffic)

Bus traffic load

Permanent display of the bus traffic load (0 ... 100 %),


CAN:Reception of CAN message frames incl. filtering,

Transmission of CAN message frames and sequences (message lists)

CANopen: Interpretation of all CAN messages according to the CANopen spec as SDOs, PDOs, NMT-, Heartbeat-, Emergency-, Sync- and Time stamp

(CiA301, CiA302, CiA305, CiA401, CiA402, CiA404, CiA406, CiA408, CiA410, upgradeable)

Electrical Parameters

Power supply

Via the supplied wide-range power supply pack (9 ... 36 V DC)

Measuring of the differential voltage

Measuring of the loop resistances

Measuring of the cable length

typ. -0.75 V ... 3.00 V

typ. 0 Ω ... 800 Ω

typ. 0 m ... 500 m

Measuring of the CAN supply voltage

0 ... 36 V

Mechanical Parameters

CAN connection

2 x 9-pin D-Sub 9 connectors

PC connection

Self-powered device to USB Specification 1.1, electrically isolated

Trigger output for the oscilloscope

BNC socket, electrically isolated


Aluminum plate housing, degree of protection: IP20

Temperature range

Operation: 5 ... 40 °C, storage: -20 ... 60 °C

Dimensions (Device / Case)

170 mm x 134 mm x 40 mm/ 504 mm x 354 mm x 119 mm

Weight (Device / Case)

approx. 600 g/ approx. 5000 g