Hardware, Installation and Configuration
2-11
GPS Antenna
1
The GPS option on the RCIM III includes an active GPS antenna and coaxial cable.
The antenna receives the GPS satellite signals and passes them to the receiver. The GPS
signals are spread spectrum signals in the 1575 MHz range and do not penetrate
conductive or opaque surfaces. Therefore, the antenna must be located outdoors with a
clear view of the sky.
If a different antenna or cable is used, it should match the following specifications:
•
50 Ohm impedence
•
27 dB gain
•
3.3 volt DC power max 30 ma.
External Interrupt I/O Connector
1
The external interrupt I/O connector on the RCIM III is a Molex LFH-60 (Low Force
Helix) that provides twelve outputs and twelve inputs.
The external outputs allow equipment to be attached and controlled by the RCIM. The
outputs are driven by a multiplexer which can select any of the programmable interrupt
generators (PIGs), real-time clock timers (RTCs), edge-triggered interrupts (ETIs) or
distributed interrupts (DIs) to drive the output. The selection is controlled by a set of
configuration registers.
See Chapter 3 for information on using external output interrupts and programmable
interrupts.
The pin-outs for the external interrupt I/O connector are shown in Figure 2-6.
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