HyQuest Solutions Pty Ltd
Point Velocity Display - Model PVD100
©
Copyright
5
Issue 1.00 4 Apr, 2007
3. Installation
3.1 Hardware
Connections
Current Meter Input Connector
The
PVD100
provides two banana plug
connections to the current meter.
The DB9 female connector on the
PVD100
,
provides the RS232 interface and the signal
driver output.
RS232 Interface
– This interface is designed to directly connect to a handheld computer with
an RS232C interface. Use the Comms Test function to test this interface.
Pin
PVD100 Signal Description
Direction
1 N.C.
2
Tx Data (RS232 data output)
3
Rx Data (RS232 data input)
4 N.C.
5
Data Ground 0V
6 N.C.
7 N.C.
8 N.C.
9
Signal Driver (O/C output)
Signal Driver Interface
—Pin 9 provides an interface to other instruments that may use a
current meter to perform velocity or flow measurements. Examples include the JBS
Instruments’ AquaCalc and Sutron’s DMX Discharge Measurement Recorders. The signal
provided through this connection simulates a current meter contact closure. Whenever a
contact closure is detected from the current meter, the
PVD100
outputs through this
connector, a fixed pulse-width driving signal that represents the contact closure. The signal
driver is an open-drain Field Effect Transistor (FET) that will act like a switch. The signal is
processed by the
PVD100.
To verify operation of this signal with other equipment, use the
Comms Test function which simulates a contact closure and operates this output.
CAUTION : Do not connect any type of DC voltage directly to pin 1 without a limiting
resistor as this will permanently damage the driver circuit.