Quick start manual

STER PMU Quick Start Manual Getting started
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3.2 CABLING AND CONNECTING THE DEVICE
3.2.1 CONNECTING THE POWER SUPPLY AND POWERING ON
STER PMU devices are shipped with batteries partially charged and ready for use. Batteries must be inserted
according to procedure described in chapter 5.1 Changing batteries. Device can operate on fully charged batteries
for up to 4 hours before shutting down. If the device does not power on after pressing the ON-OFF key, batteries
may need recharging.
Although the device can be immediately powered on by pressing the ON-OFF key, it is recommended to
always turn it on by plugging in the power supply.
Connect the charger to the bottom socket at the side panel, as shown on the picture below.
PS2 USB
AC/DC adapter
110VAC/12VDC
Figure 3.14: Connecting the charger (power supply)
If the device was previously powered off, it will power on automatically as soon as the charger is inserted. ON-OFF
key can only turn off the device when the charger is disconnected, to ensure that the device is never accidentally
powered off. Pressing the ON-OFF button while the charger is connected will restart the device.
Once powered on, device will start measuring and storing data immediately, storing the measurements to its
internal and, optionally, external memory.
3.2.2 CONNECTING THE GPS RECEIVER AND THE MODEM
GPS receiver is essential to the proper operation of the device. PMU measurements rely on precise time
synchronization. After a cold restart GPS receiver performs position lock-out. Acquisition time varies from few
seconds to few minutes and highly depends on GPS receiver position, obstacles to sky open view etc. For this
reason, it is recommended to connect GPS unit before connecting the measurement terminals, to allow the device
more time to synchronize with the GPS satellite system.
PS2 plug, used to connect the GPS received to the device, also provides a power supply for the external modem
device. This allows the modem to continue operating during blackout conditions
1
.
STER PMU device configures the GPRS modem automatically according to GPRS network provider settings. If SENA
Ethernet modem is used, it needs to be configured manually.
1
If Ethernet modem is used, intermediate LAN switching equipment will also need to be powered through
uninterrupted power supply (UPS) equipment, in order to keep the connection alive during blackouts.