Contemporary Research TD960801-0MC - Manual (Page 13)

TD960801-0MC
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2.4.4 AC Powered with Battery Backup
The EXTEND-A-BUS can also be powered from both an AC
and DC power source. Usually, the DC source is from a battery
supply which is connected as the DC powered option. Refer to
Figure 2-4. In this application, the EXTEND-A-BUS does not
charge the battery so separate provisions are required for
charging. If the AC source fails, the EXTEND-A-BUS will
operate from the battery source.
Figure 2-4. AC Powered with Battery Backup
2.5 Connecting to the CAN Port
The CAN port complies to the DeviceNet physical layer
specification for an isolated port. Since the port is isolated, bus
power (V+, V–) must be present in order for the port to
function. A bus power sensor has been provided in the
EXTEND-A-BUS to ensure that in the absence of bus power,
the port will not enter the “bus off” state.
2.5.1 CAN Port Assignments
A five position open style male connector has been provided on
the EXTEND-A-BUS for connections. See figure 2-5 for
connector assignments. A mating female connector has been
provided in order to make field connections.