Vaisala DMP248 Instrukcja Obsługi Pobierz pdf (Strona 36)

OPERATING MANUAL_______________________________________________________________

30 _____________________________________________________________________ U263EN-1.4

RX GND TX

X17

FIGURE 4-6 Location and connections of connector X17.

NOTE

Some PC computers can generate interferences to the measured

humidity and temperature values if the transmitter and the PC are

connected to different mains outlets. To minimize the possibility of

these interferences, always use the same main outlet (same phase of

the main electricity) for the PC and the power supply of DMP248. It

is always preferable to use the connector X6 instead of the connector

X17 because it is more immune to interferences.

Reverting to factory settings of the serial port

If the serial port settings are not known, no commands can be given

via the serial interface. The settings can be reverted to the factory

settings by inserting a jumper in connector X16. The jumper must be

inserted when the power is on!

OPENED COVER OF THE DMP248

X16

FIGURE 4-7 Forcing the serial port settings back to factory settings.

When the jumper is inserted the serial line factory settings become

valid, but only temporarily. The transmitter must be given new

settings; otherwise, the transmitter uses the old, unknown settings

after power-up. When the new settings have been given, the

transmitter must be reset. The jumper must be removed before the

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Vaisala DMP248 Instrukcja Obsługi Strona 36