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Installation 3-4
B1272M001 BARNETT ENGINEERING LTD. ProTalk Cv2
Figure 10 Output Wiring
Figure 11 Serial Cable
3.4 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 10 shows the
connection for an output used as a relay driver.
3.5 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, J2, 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 11.
To restore the Cv2 to operation, the cable must be unplugged.
The serial programming cable is supplied with the Cv2.
J2 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 12 shows a stand-alone Cv2 installation.
The programming PC is present only when a configuration database is to 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 cannot be used to place outgoing calls. If the Cv2 is
to remain operational during a power outage, the DC power provided to the unit must be
uninterrupted.
Figure 13 shows a packaged Cv2 installation. The programming PC is present only when a
configuration database is to 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 7 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.