Operation Manual
SYSTEM
OCR-504 Multispectral Radiometer
SECTION
D - OPERATION
frames are output from the instrument according to the
maximum frame rate
configuration parameter.
Network Operation
Network operation for the OCR-504 is defined as continuous operation of the
instrument within the scope of a SatNet™ network. Furthermore, standard
network operation means that the instrument is
not
operating as a Network
Master device. While operating in this mode, only the network interface is used
for communication. The telemetry interface is disabled.
To enable network operation, a number of criteria must be met; otherwise
operation will default to running autonomously. First, the
network mode
configuration parameter must be enabled. Secondly, the network interface pins,
NA and NB, must be physically connected to another SatNet™ instrument
operating as a Network Master device. These first two conditions will ensure
that network operation is invoked. However, to ensure proper operation of the
network, additional criteria must be adhered to. Namely, the
network baud rate
configuration parameter must be set to the same baud rate as the Network
Master. Finally, the
network address
configuration parameter must be unique
to all other instruments in the network.
During network operation, the OCR-504 is completely controlled by the Network
Master. All communication is relayed through the network between the Network
Master and the other instruments running in network operation mode. Instead
of sending a telemetry frame through the telemetry interface, as is done in
autonomous operation, each instrument sends its telemetry through the
network interface to the Network Master. The Network Master then channels
the telemetry through its telemetry interface where it can be collected by a data
acquisition system.
The only way to gain control access of an instrument running in network
operation mode is through the telemetry interface of the Network Master. A
Network Master has a set of commands for controlling telemetry similar to that
of an instrument running autonomously. These commands can also control
other instruments in the network. For more information on the Network Master
and its operational command structure, refer to the operating manual of your
Network Master device.
While operating in a network, the OCR-504 accepts commands only from the
Network Master. At the N
etwork Master’s discretion, instruments are either
commanded to sample their sensors and compose a telemetry frame, or free
run at their own frame rate setting. Instead of sending the telemetry frame
through the telemetry interface, as is done in autonomous operation, each
instrument sends its telemetry through the network interface to the Network
Master. The Network Master then channels the telemetry through its telemetry
interface where it can be collected by a data acquisition system.
