Direct RS-232 connection

For this simple configuration, the AVW200 can be used straight from the box without changing settings in Device Configuration Utility. Sensor(s) are attached directly to the AVW200, which is connected directly to the data logger via a DB9 pin-to-pigtail serial cable or null modem cable. The serial cable pigtail end connects to data logger control port pairs (C1/C2 through C7/C8). The null modem cable has a DB9 connector to attach to the data logger RS-232 port.

 

 

The following steps are used to measure the sensor(s):

1. Attach the vibrating-wire sensor(s) to the AVW200 as shown in Wiring for sensor connections.

2. Use the serial cable to attach the AVW200 to a control port pair (such as C1/C2, C3/C4, C5/C6, or C7/C8) on the data logger, or use the null modem cable to attach the AVW200 to the RS-232 port on the data logger.

3. Connect one end of the power cable to the 12V and G terminals on the AVW200; connect the other end to the 12V and G terminals on the data logger or external power supply. See Power and ground and Data logger wiring for a direct connection.

4. Create a CRBasic program that includes an AVW200() instruction for each sensor.

   For example, the following AVW200() instructions can be used to measure two sensors:

    
   AVW200(Result,ComC1,200,200,Dst(1,1),1,1,1,1000,3500,2,_60HZ,1,0)

   AVW200(Result,ComC1,200,200,Dst(2,1),2,1,1,1000,3500,2,_60HZ,1,0)
    

   where:

   AVW200 connects to data logger control ports C1/C2 via a serial cable (option ComC1)

   Begin frequency = 1000

   End frequency = 3500

   Excitation voltage = 12 VDC peak to peak (option 2)

Refer to Programming with the AVW200() instruction for a thorough description of the AVW200() instruction and its parameters. Refer to Direct RS-232 connection with two sensors for a complete example program that measures two vibrating-wire sensors with no multiplexer.