Barnett Engineering Pro Talk ARU CV2 - Manual (Page 13)

Installation 2-4
B1272M001 BARNETT ENGINEERING LTD. ProTalk Cv2
Figure 9 Output Wiring
Figure 10 Serial Cable
2.4 Output port connections
The output ports are open collector drivers that can
sink up to 500 mA through a load connected to a
voltage of up to +50 VDC. If an inductive load
such as a relay is connected to an output, install a
protective reverse-biased diode across the load to
prevent damage to the output from the inductive flyback voltage. Figure 9 shows the
connection for an output used as a relay driver.
2.5 Configuration programming connection
When the configuration database is transferred from
the PC to the Cv2, a serial communications cable is
connected between the COM port of the computer and
the serial programming port, J1, on the Cv2. When
the cable is attached to the connector on the Cv2, the
DTR signal is sensed by the Cv2 and it enters the
programming mode. The cable used to connect
between the two pieces of equipment is shown in
Figure 10. To restore the Cv2 to operation, the cable
must be unplugged. The serial programming cable is
supplied with the Cv2.
J1 can also be used to program the cellular radio in
the Cv2. When the Cv2 detects that the serial port is
being used to program the cellular radio, it will
automatically route the communications to the radio.
Figure 11 shows a stand-alone Cv2 installation. The
programming PC is present only when a configuration
database is be transferred to or from the Cv2; the
programming telephone can be either permanently
installed or used only for voice recording. Note that
the phone set can also be used to place outgoing calls,
if required. If the Cv2 is to remain operational during a power outage, the DC power provided
to the unit must be uninterrupted.
Figure 12 shows a packaged Cv2 installation. The programming PC is present only when a
configuration database is be transferred to or from the Cv2; the programming phone is part of
the package and can also be used to place outgoing calls. The built-in power supply contains
an 8 AH battery and is capable of running the Cv2 for at least 12 hours during a power outage.
The power supply has a power fail output signal that can be connected to any of the input ports
on the Cv2 and programmed as an alarm point.