Campbell Scientific CS450/CS455 Pressure Transducer - Manual (Page 10)

CS450/CS455 Pressure Transducer
3.1 Connection
Communicating with the CS450/CS455 requires the sensor to be either
connected to a PC or an SDI-12 Recorder. The sensor typically connects to a
PC via the A200 sensor to PC interface. Many SDI-12 Recorders allow
communication to the sensor via a terminal screen. Configurable settings can
be changed via SDI-12 commands or by using Campbell Scientific’s software
Device Configuration Utility.
3.1.1 Using the A200
The A200 or another device is required to connect the CS450/CS455 to a PC.
This allows sensor settings to be changed via our Device Configuration Utility.
3.1.1.1 Driver Installation
If the A200 has not been previously plugged into your PC and your PC
operating system is not Windows 7, the A200 driver needs to be loaded onto
your PC.
Drivers should be loaded before plugging the A200 into the PC. NOTE
The A200 drivers can be downloaded, at no charge, from:
www.campbellsci.com/downloads .
3.1.1.2 Wiring
One end of the A200 has a terminal block while the other end has a type B
female USB port. The terminal block provides 12V, G, TX, and RX terminals
for connecting the sensor (see FIGURE 3-1 and TABLE 3-2).
A data cable (pn 17648) ships with the A200. This cable has a USB type-A
male connector that attaches to a PC’s USB port, and a type B male connector
that attaches to the A200’s USB port.
3.1.1.3 Powering the Sensor
The A200 provides power to the sensor when it is connected to a PC’s USB
port. An internal DC/DC converter boosts the 5-Vdc supply from the USB
connection to a 12-Vdc output that is required to power the sensor.
3.1.1.4 Determining Which COM Port the A200 Has Been Assigned
When the A200 driver is loaded, the A200 is assigned a COM port number.
This COM port number is needed when using the Device Configuration Utility
or a PC terminal software such as HyperTerminal.
Often, the assigned COM port will be the next port number that is free.
However, if other devices have been installed in the past (some of which may
no longer be plugged in), the A200 may be assigned a higher COM port
number.
To check which COM port has been assigned to the A200, you can monitor the
appearance of a new COM port in the list of COM ports offered in your
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