Comparing physical layer CAN diagnostic devices

You have problems with your bus, in your system or at your customer’s site. You have to measure and stop guessing – what you need at this point is a diagnostic device.

The market is confusing, they try to deceive with false promises but giving no real comparison. We try it and compare the GEMAC devices. For this comparison, we take the three devices that do measure at the physical layer. CANalarm has special features, which has nothing to do with physics and CANvision is as protocol monitor working on logical layer only. Therefore these two products are not listed in this comparison.

A table like this with features can only be some kind of hint. Features differ from device to device, even when both of them have it. There may be a different understanding of a feature or a different expectation. Please open a ticket within the support area if there are special questions running in your mind.

In this article, we go even deeper into the agony of choice and make recommendations.

revised and updated March 2017

KONICA MINOLTA DIGITAL CAMERA

Features

In General

Bus systems (CAN, CANopen, DeviceNet, SAE J1939)  ●  ●  ●
Automatic baud rate scan / Node or Identifier Scan  ● / ●  ● / ●  ● / ●
Export data  ●  ●  ●
Print function Screenshot or Export  ●
Manage measurements  ●

Online Monitoring

Display bus status
Display bus traffic load ● with progress  ●
Display errorframe counter (absolute / per second) ● with progress  ●
Display optional CAN supply voltage ● with progress  ●
Display shield voltage ● with progress

Absolute measurements CAN_H / CAN_L against V-

Common mode voltage
CAN Level absolute / differential ● / ●

Bus wiring

Cable length
Termination resistors
Loop resistance (bus, power supply)
Shorts
Breaks

Node Measurement

Bus system CAN with ID scan
Bus system CANopen with NodeID-Scan
Bus system DeviceNet with MacID-Scan
Bussystem SAE J1939 with Sourceadress-Scan
Quality level measurement of all nodes
Quality level, disturbance-free voltage range, edge steepness
Display oscillogram, differential signal, physical or logical decoded
Display oscillogram, absolute signal (CAN_H / CAN_L vs. reference ground)

Protocol Monitor

Send CAN messages
Receive CAN messages
Symbolic decode CAN messages
Trigger / Suchfunktionen
Trace CAN messages (configurable start- / stop conditions)
Receive / decode CANopen messages
Receive / decode SAE J1939 messages as well as ISOBUS and NMEA 2000

Online Trigger

Recording time max. 1 week unlimited max. 10 years
Gauges 4x physical + 4x logical
E-Mail warning
Control point access (SNMP)
Access with browser (HTML5, mobile devices)
Error output  ●
Displays oscillogram on single measurement
Tone signal on trigger

Key

Function unsupported
in basic version included
can be unlocked by license
included in license