Publication Date:
2022-05-26
Description:
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
the VMCM provides a way to look at incoming data. qualify it
re-transmit it to the VMCM. The VMCM will reply and
preprocessor can channel the data to the modem. In the event
VMCM malfunction. the preprocessor has a timeout function
will turn off the carrier keeping the line quiet.
Description:
Funding was provided by the Office of Naval Research
under contract Number N00014-84-C-0134, NR 083-400.
Keywords:
Flow meters
;
Oceanographic instruments
Repository Name:
Woods Hole Open Access Server
Type:
Technical Report
Format:
application/pdf
