Campbell Hausfeld SDM-CAN - Manual (Page 9)

Section 1. Introduction
• A 3 way, unpluggable screw terminal block for CAN High, Low and G also
provided.
• Transmit and acknowledge to CAN-Bus can be disabled by a hardware
jumper for safety reasons, e.g. for in-vehicle, listen only monitoring.
• I/O terminal used for interrupts is pulled low by a 100Kohm resistor and is
driven to 5V via a 1Kohm impedance when an interrupt is pending.
1.2.2.1 Power Consumption
• Typical active current in self-powered, isolated mode with the CAN-Bus in
the recessive state: 70mA. (this is when the SDM-CAN is not transmitting).
• Typical active current in self-powered, isolated mode with the CAN-Bus in
the dominant state: 120mA (this is when data is being transmitted from the
SDM-CAN device).
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.
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