Technical Description
The SDM-CAN interface allows a Campbell Scientific datalogger to sample data directly from a CANbus communications network. CANbus data can be stored (and synchronized) with other data values measured directly by the datalogger, allowing testing and verification of CANbus-based data alongside measurements made independently via the datalogger'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).
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SDM-CAN Specifications
- Operating Voltage: 7 to 26 Vdc
- Optional (switch selectable) galvanic isolation between the datalogger and the CANbus. The
minimum isolation breakdown is 50 V; this barrier is for signal isolation only (i.e., it is not a safety barrier)
- 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)
- A three-way, unpluggable screw terminal block for CAN High, Low, and G provided
- For safety reasons, can disable CANbus transmit and acknowledge via a jumper (e.g. for in-vehicle, listen only monitoring)
- Dimensionsa:
17.5 x 10.0 x 2.3 cm
(6.9” x 3.9” x 0.9”)
- Weight: 0.3 kg (0.14 lb)
Current Consumption
- Typical Active in Self-Powered, Isolated Mode:
70 mA (recessive state);
120 mA (dominant state)
- Typical Active, Non-Isolated:
30 mA (recessive state);
70 mA (dominant state)
- Typical Standby (with or without isolation): < 1 mA
- Communications with Datalogger: typically 50 mA
- RS-232 Port Active: typically 50 mA
a - The device can be vertically mounted with all the connectors on the top surface.
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