Accession Number : ADA192142
Title : An FSK (Frequency Shift Keying) Telemetry Module for Vector Measuring Current Meters.
Descriptive Note : Technical rept.,
Corporate Author : WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
Personal Author(s) : Fucile, Paul D ; Valdes, James R
PDF Url : ADA192142
Report Date : Dec 1987
Pagination or Media Count : 48
Abstract : 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.
Descriptors : *COMMUNICATION AND RADIO SYSTEMS, *TELEMETER SYSTEMS, *VECTOR ANALYSIS, DATA PROCESSING EQUIPMENT, FREQUENCY SHIFT KEYERS, FUNCTIONS, HIGH POWER, INSTRUMENTATION, LOOPS, MEASUREMENT, MEASURING INSTRUMENTS, MODEMS, MODULAR CONSTRUCTION, MOORING, OPERATION, PROCESSING, SURFACES, TIME
Subject Categories : Radiofrequency Wave Propagation
Electrical and Electronic Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE