Vaisala Drycap DMT152, Руководство пользователя

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7. Troubleshooting
7.1 Typical Problems
If you have a problem with DMT152, first read the following sections concerning the behavior
and error indications of the transmitter:
• Configuring Analog Outputs (page 35)
• Error State (page 57)
• Error Codes (page 58)
Possible causes of errors include insufficient supply voltage, excessive supply voltage
fluctuation, physical damage to the transmitter, and incorrect connections. Connection
problems can be caused by misconfiguration of the analog outputs or the serial line. Also
remember that the startup of the transmitter may take up to 15 minutes.
Some problems can be solved by simply resetting the transmitter. You can reset the
transmitter by disconnecting the power or issuing the
RESET command on the serial line.
If you cannot locate the source of the error and return the transmitter to the normal state,
contact Vaisala technical support. See
www.vaisala.com/support for more information.
7.2 Unknown Serial Settings
If you are not sure what the serial settings of your transmitter are, follow these steps to view
and change the settings.
1. Make sure there are no other transmitters on the serial line.
2. Provide the transmitter with a 9 V supply voltage. This voltage is enough to start it in the
error state.
3. Connect to the serial line using the error state serial line settings
19200 N 8 1
.
4. Give the ? command to view the transmitter settings, including the serial settings and
address. For an output example, see Show Device Information (page 33) .
You may have to give the command several times if there are characters in the buffer.
5. If necessary, set new serial line settings using the SERI command. For instructions on
using the command, see Set Serial Line Settings (page 39) .
7.3 Error State
If the voltage supplied to DMT152 is too low for reliable operation, or fluctuates heavily, or
there is some serious problem that prevents measurement, DMT152 will enter an error state.
The error state is indicated by the following:
• Analog current output at 0 mA or 4 mA (according to selected range)
• Analog voltage output at 0 V
Chapter 7 – Troubleshooting
57