Overview
TABLE 2-7 7200 DIGITAL I/O SPECIFICATIONS
DIGITAL INPUTS DESCRIPTION
Voltage Levels
Logic Level High Voltage Range: (+4.5 to +26.7 VDC)
Logic Level Low Voltage Range: (0 to +1 VDC)
Input Impedance 10 K Ohms (Nominal)
Transient Voltage Suppression
Electrostatic discharge (ESD) as defined in IEC 1000-4-2,
Electrical fast transients (EFT) per IEC 1000-4-4
DIGITAL OUTPUTS
DESCRIPTION
Output Type Relay Contact Closure
Maximum Input Voltage 220 VDC or 125 VAC RMS
Maximum Load Current 1 Amp
Maximum Switched Power 62.5 VA
DIGITAL I/O
DESCRIPTION
Output Type Open Collector Transistor
Maximum Input Voltage 26.7 VDC
Maximum Load Current 500 mA
Transient Voltage Suppression
Electrostatic discharge (ESD) as defined in IEC 1000-4-2,
Electrical fast transients (EFT) per IEC 1000-4-4
Specifications subject to change without notice.
2.4.1.4 Resolver-to-Digital Converter Printed-Circuit Board Assembly
The Resolver-to-Digital Converter (RDC) PCB accepts analog inputs from the
antenna-mounted AZ, EL, and/or POL resolvers (via the rear panel termination
circuit card) and provides a binary digital encoded representation of the pointing
angles for each axis to the CPU. VME bus interface circuitry is included, based
upon CPU and RDC timing requirements. The standard configuration is for single-
speed resolvers and 16-bit encoding; however, the RDC PCB can be configured to
accept dual-speed resolver inputs and provide higher resolution as required.
Alternate means of position encoding are available, including high accuracy
absolute optical encoders, in which case an alternate position interface circuit card
is provided.
2.4.1.5 Optical Encoder Daughter Board (Optional - AZ and EL)
The OE daughter card is mounted on its own VME card. This card takes the EIA-
422A serial encoder data and converts it to 24 bits for use by the CPU. Two
Complex Programmable Logic Devices (CPLDs) are employed to convert the buffered
serial data to parallel data for use by the CPU. The card reads each encoder about
4000 times per second. The bits of position resolution are dependant on the actual
optical encoder used, however, most optical encoder systems have 18 bits of
resolution.
2-14
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