Vaisala WS425 - Manual (Page 75)

Chapter 6 ___________________________________________________________ Troubleshooting
VAISALA _______________________________________________________________________ 75
Instructions for Opening a Serial
Terminal Connection to WS425
1. Connect an RS-232 cable between your terminal computer, power
supply and your sensor. If you are using a Vaisala
RS-232 cable with code ZZ45203, the cable colors are the
following:
Connections to power supply:
Black (WS425 pin 1)
- Ground
Brown (WS425 pin 11) - +12 VDC
Connections to terminal PC:
Red (WS425 pin 9)
- RxD (PC 9-pin serial
port, pin n:o 2)
Blu (WS425 pin 10) - TxD (PC 9-pin serial
port, pin n:o 3)
Yellow (WS425 pin 8) - GND (PC 9-pin serial
port, pin n:o 5)
2. Open the Windows HyperTerminal program. From HyperTerminal,
select File - Properties and click Configure. Set communication
parameters 9600,8,N,1 and Flow Control as None.
3. From HyperTerminal, select View - Font. Set Font as Terminal.
4. Select Call - Disconnect. Then select Call - Connect.
5. Switch the sensor power supply on and off. Make sure that the
sensor is completely powered down before reconnecting the power
supply (Many power supplies store energy and need time to be
discharged completely). During the first 5 seconds after the sensor
starts up, the serial line settings will remain as 9600, 8, N, 1. After
this, the programmed communication parameters will become
effective.
You have 5 seconds time to type: open<Enter>
Make sure that the sensor is already on when you type the first
letter. If you do not succeed, try several times and check your
connections.
6. After a successful OPEN command, the sensor should display a
configuration menu. You can now adjust the settings.