Barnett Engineering ARU CV2 Output port connections, Configuration programming connection

Figure 10 Serial Cable

Figure 9 Output Wiring

Installation 2-4

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.

B1272M001 BARNETT ENGINEERING LTD. ProTalk Cv2