Vaisala Hydromet Data Collection Platform - Manual (Page 136)

User's Guide ______________________________________________________________________
134 _________________________________________________________________ M210933EN-C
The QML logger modem control allows optional timed powering to
gain lower total power consumption. This means that the modem is
powered only when necessary, for example, when it is transmitting data
or it is needed for service operation.
In optional power control, the power cable is connected to the terminal
strip via the relay that is controlled using a free excitation pin from the
logger channels 0, 1, 2, or 3. These pins supply only 12 V/25 mA, which
is not sufficient for powering the modem without the relay.
In excitation control, the additional relay control for the power supply
is set in the Timers view.
Modem Control Parameters
0711-155 Figure 65 Device Configurations View
Regardless of the external interface used (PSTN, GSM network or
other), similar interface and parameters are used for configuring the
operation of the modem.
NOTE Excitation control must be used with the Answer incoming calls
option, as in optional power control the modem is powered only when
a connection is established by the QML logger.