An FSK (Frequency Shift Keying) Telemetry Module for Vector Measuring Current Meters

The EG&G Vector Measuring Current Meter (VMCM) used in mooring work provides a 20 ma Serial ASCII Instrumentation Loop (SAIL) communication system. A projected application of the VMCM is to have a surface mooring communicate with a series of VMCMs via a Frequency Shift Keying (FSK) link. While a...

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Bibliographic Details
Main Authors: Fucile, Paul D, Valdes, James R
Format: Report
Language:English
Subjects:
COMMUNICATION AND RADIO SYSTEMS
DATA PROCESSING EQUIPMENT
Electrical and Electronic Equipment
FREQUENCY SHIFT KEYERS
FUNCTIONS
HIGH POWER
INSTRUMENTATION
LOOPS
MEASUREMENT
MEASURING INSTRUMENTS
MODEMS
MODULAR CONSTRUCTION
MOORING
OPERATION
PROCESSING
Radiofrequency Wave Propagation
SURFACES
TELEMETER SYSTEMS
TIME
VECTOR ANALYSIS
WUNR083400
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Summary:The EG&G Vector Measuring Current Meter (VMCM) used in mooring work provides a 20 ma Serial ASCII Instrumentation Loop (SAIL) communication system. A projected application of the VMCM is to have a surface mooring communicate with a series of VMCMs via a Frequency Shift Keying (FSK) link. While an FSK modem can communicate with the VMCM, a problem exists with the general operation of the VMCM. If the VMCM is addressed to dump data, it remains on until the unit is re-addressed. If a failure in the link occurs, then the VMCM stays on in a higher power mode and the batteries will be depleted early. The insertion of a processing block between the modem and the VMCM providers a way to look at incoming data, qualify it and re-transmit it to the VMCM. The VMCM will reply and the preprocessor can channel the data to the modem. In the event of a VMCM malfunction, the preprocessor has a timeout function and will turn off the carrier keeping the line quiet. Original contains color plates: All DTIC and NTIS reproductions will be in black and white.