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SDM-CAN Interface CANbus para el datalogger
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Resumen

The SDM-CAN allows a Campbell Scientific datalogger to sample data directly from a CANbus communication network. This allows 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.

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Ventajas y características

  • Supports various CAN modes
  • Utiliza el último controlador Can de Philips
  • Puede usarse en aplicaciones de red, incluyendo ensayos automoción

Imágenes

Descripción detallada

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).

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 datalogger enables individual modules through an addressing scheme; up to 15 SDM-CANs can be connected to one datalogger.

SDM-CAN Helper

SDM-CAN Helper is an add-on program for our RTDAQ Real-Time Data Acquisition Soft ware. This add-on program walks users through the process of configuring their SDM-CAN, connecting the SDM-CAN to the datalogger, sending an appropriate program to the datalogger, and setting up their datalogger 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.

Preguntas frecuentes

Número de FAQs relacionadas con SDM-CAN: 3

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  1. Four byte IEEE4 (floating point) decoding can be handled Up to 24 bit signed and unsigned integer decoding can be handled. However, there are methods to use byte math in the datalogger program code to decode CAN frame integer data values larger than 24 bits.


Especificaciones

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
  • The device can be vertically mounted with all the connectors on the top surface.
  • 17.5 x 10.0 x 2.3 cm (6.9 x 3.9 x 0.9 in.)
Weight 0.3 kg (0.14 lb)

Typical Current Consumption

Active in Self-Powered, Isolated Mode
  • 70 mA (recessive state)
  • 120 mA (dominant state)
Active, Non-Isolated
  • 30 mA (recessive state)
  • 70 mA (dominant state)
Standby < 1 mA (with or without isolation)
Communications with Data Logger 50 mA
RS-232 Port Active 50 mA

Compatibilidad

Nota: lo siguiente muestra información de compatibilidad notable. No es una lista de todos los productos compatibles.

Dataloggers

Producto Compatible Nota
CR1000 (retired)
CR1000X
CR200X (retired)
CR216X (retired)
CR300 (retired)
CR3000 (retired) For the CR3000, SDMs are connected to the ports labeled SDM-C1, SDM-C2, and SDM-C3.
CR310
CR350
CR5000 (retired) For the CR5000, SDMs are connected to the ports labeled SDM-C1, SDM-C2, and SDM-C3.
CR6
CR800 (retired)
CR850 (retired)
CR9000X (retired) For the CR9000X, SDMs connect to ports provided on the CR9032 CPU module.

Miscelaneo

Producto Compatible Nota
21X (retired)
CR10 (retired)
CR10X (retired)
CR23X (retired)
CR500 (retired)
CR510 (retired)
CR9000 (retired) For the CR9000, SDMs connect to ports provided on the CR9080 PAM module.
GRANITE 10
GRANITE 6
GRANITE 9

Información de compatibilidad adicional

Data Logger Considerations

Programming

Data is transferred between the SDM-CAN interface and the data logger using Campbell Scientific’s high-speed SDM communications protocol. The CANBUS Instruction controls the SDM-CAN operation in CRBasic; Instruction 118 controls the SDM-CAN operation in Edlog.

Power Considerations

The SDM-CAN draws 1 mA quiescent, up to 120 mA active. The data logger's sealed rechargeable power supply (or an external one) connected to a continuous charging source is recommended.

Enclosures

The SDM-CAN requires a desiccated, non-condensing environment; a Campbell Scientific enclosure is recommended. The SDM-CAN has built-in keyhole flanges for mounting to the backplates of Campbell Scientific enclosures.

Descargas

SDM-CAN OS v.4 (612 KB) 21-11-2006

Current version of the SDM-CAN firmware.

Artículos y notas de prensa