Campbell Scientific SDM-CAN Datalogger to CANbus Interface - Manual (Page 12)

SDM-CAN Datalogger-to-CANbus Interface
• Where the DC-DC converter is not used, and power is provided to the
isolated CAN driver circuits by an external source, the current drain by the
SDM-CAN is approximately 50 mA lower than the figures quoted above.
• Typical active current, non-isolated with the CAN-Bus in the recessive
state: 30mA.
• Typical active current, non-isolated with the CAN-Bus in the dominant
state: 70mA
• Typical Standby Current with or without isolation is less than 1mA (in this
mode the CAN hardware is turned off so the module cannot wake on
receipt of CAN data). Current consumption increases to typically 50 mA
during periods of communication to the datalogger or when the RS232
port is active.
1.2.3 Physical Specifications
• Maximum dimensions: width 175mm, height 100mm, depth 23mm
(without mounting brackets).
• Weight: 300g without mounting brackets.
• The device can be vertically mounted with all the connectors on the top
surface.
• The SDM address switch is on the right hand side.
• Fittings are available to allow vertical mounting in the CR9000 or on
enclosure chassis plates.
2. Installation
The SDM-CAN can be mounted in a normal card slot of a CR9000 (using
optional special end brackets), on a chassis plate (using the standard brackets
supplied) or can be left free-standing.
CR9000 and CR7 dataloggers require optional SDM connection kits and all
dataloggers may require an upgrade to a version of operating system which
supports the SDM-CAN interface.
2.1 Address Switch Configuration
Before installing the SDM-CAN, set the SDM address switch to ensure that the
interface has a unique address on the SDM bus, and that the address is set to
match the commands in the datalogger program relevant to each interface.
The SDM address switch can be set to 1 of 16 addresses. The factory-set
address is 00. TABLE 2-1 shows switch position and the corresponding
address. The Base 4 address is also shown, as this is the address entered in the
datalogger program.
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