Distributed
Input/Output (I/O) modules from GMW enable data
acquisition and system control functions to be placed
locally at the transducer or controlled unit. This
provides significant improvement in the S/N ratio
and operational reliability, together with cost
savings in cabling, installation & configuration,
and in maintenance.
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 Analog
Signals via Optical Cable
The PPM Point-To-Point (p2p) systems allows transmission
of analog signals with a frequency response from
DC up to 10 Mhz or 40Hz up to 3GHz via a fiber-optic
cable.
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 Sentinel
II and Sentry II Fiber Optic Links
The
Sentinel II Fiber-Optic-Link offers a signal bandwidth
of 2kHz to 1GHz. The 50ohm input and output means
that they can be coupled to commonly used sensors
and measurement systems. A range of built-in attenuators
and a low noise pre-amplifier allow the user to
vary the gain of the system from a nominal +21dB
down to -24dB, and up to +33dB
The
Sentry II 250 Fiber-Optic-Link offers similar performance
to the Sentinel II, but is optimized for lower frequency
operation (40Hz to 250MHz bandwidth).
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 RS-232
to Fiber-Optic Converters
Provide voltage and ground-loop isolation with the
Group3 FTR. This device converts standard RS-232
signals to light and then transmits them up to 1km
away over low cost glass fiber. Power may be provided
externally or from the serial port.
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 Isolated
Control and Monitoring (without Computers)
Isolated control and monitoring with just a fiber
optic cable pair up to 1000 meters in length, and
without computer control. This configuration uses
two Group3 Control CNA Device Interfaces (DI) modules
in a direct communication mode. Analog I/O and digital
status & control signals are transfered optically
from one CNA to the other.
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 Fiber-optic Isolated Computer Control
With its fiber optic serial data
link, the Group3 Control system is very well suited
to charged particle accelerator or other electrically
noisy applications where voltage isolation and noise
immunity is required. Host computer options include:
PC, VME, CAMAC, or Standard Bus computers.
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