Sokkia GSR2700 IS, Инструкции по эксплуатации, Страница: 25 / 87

14 GSR2700 IS Operations Manual
Chapter 2 GSR2700 IS Components
2.2.2 Power port and power input
The GSR2700 IS has one power input port for connecting an
external power source to the receiver, such as an external battery,
as an alternative to using the internal batteries. See Section 2.4,
Batteries , page 15 for more information about the internal
batteries, and Section 5.2, Power Source , page 42 for more
information about power input.
2.2.3 Communication ports
The two communication ports enable you to communicate with
accessory devices, such as a data collector or radio. As well, each
communication port provides a power output for powering
accessory devices (for example, an external UHF radio).
Typically, the COM1 port is intended for use with a data collector.
The COM2 port is typically intended for use with a radio. You
can also connect your PC’s USB port to the COM2 port for high-
speed data transfer from internal memory.
The GSR2700 IS can provide power output through the COM1
and COM2 ports for powering accessories. The output voltage
from the COM port is approximately the same as the input to the
unit. For more information about powering peripheral devices,
see Section 5.3,
Powering Peripheral Devices , page 44.
2.3 Cables
Each GSR2700 IS cable connector is keyed to ensure that the cable
can be inserted in only one way, to prevent damage to both the
GSR2700 IS and the cables. In addition, the connectors that are
used to secure the cables to the receiver have a latching
mechanism that requires careful insertion and removal.
Cables are color coded according to the port they connect to (red
for the power port, blue for the COM1 port, and white for the
COM2 port). Both the cable and the corresponding port on the
receiver indicate the appropriate color.