CANbus data can be stored (and synchronized) with other data values measured directly by the data logger, allowing testing and verification of CANbus-based data alongside measurements made independently via the data logger's input channels. The SDM-CAN also supports transmission of data onto a CANbus network.
The SDM-CAN uses the latest Philips SJA1000 CAN controller clocked at 16 MHz; CAN 2.0A and 2.0B active and passive modes are supported, which includes SAE J1939. The CANbus protocol is used in a number of networking applications, including vehicle data acquisition systems (VDAS).
The SDM-CAN can act as a passive “listen-only” device, poll remote devices for data, or act as a sensor. To poll remote devices it sends or responds to Remote Frame Requests. It acts as a sensor by sending data packets to the CANbus network. The SDM-CAN supports baud rates up to 1 MB (1 M, 800 k, 500 k, 250 k, 125 k, 50 k, 20 k, and lower). Non-standard baud rates may be possible. CAN data frames can also be built and sent.
The data logger enables individual modules through an addressing scheme; up to 15 SDM-CANs can be connected to one data logger.
SDM-CAN Helper is an add-on program for our RTDAQ Real-Time Data Acquisition Software. This add-on program walks users through the process of configuring their SDM-CAN, connecting the SDM-CAN to the data logger, sending an appropriate program to the data logger, and setting up their data logger to collect specific values from the CANbus network.
SDM-CAN Helper is available, at no charge, from the Downloads section. Users must have a valid installation of RTDAQ on their computer to install the SDM-CAN Helper program.
| Function | Allows a data logger to sample data directly from a CANbus communication network. Uses latest CAN controller. |
| Number of Channels | 1 |
| Operating Temperature | Tested from -40° to +80°C. |
| Operating Voltage | 7 to 26 Vdc |
| Isolation | Optional (switch-selectable) galvanic isolation between the data logger and the CANbus. The minimum isolation breakdown is 50 V; this barrier is for signal isolation only (that is, it is not a safety barrier). |
| Controller | Uses the latest Philips SJA1000 CAN controller clocked at 16 MHz. |
| CANbus Physical Connection | Conforms to CIA draft standard 102 version 2, 9-pin D connector. (The interface will differ from this standard only with respect to pin 9, which outputs 5 Vdc instead of 7 to 13 Vdc.) |
| Screw Terminal Block | A three-way, unpluggable screw terminal block for CAN High, Low, and G is provided. |
| Safety | For safety reasons, can disable CANbus transmit and acknowledge via a jumper (for example, for in-vehicle, listen-only monitoring) |
| Dimensions |
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| Weight | 0.3 kg (0.14 lb) |