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GLOSSARY OF TERMS ( CONTINUED)
VLF--Radio frequencies from 10 to 30 KHz., (10,000 to 30,000 Hz.)
LF--Radio frequencies from 30 to 300 KHz.
DPM-~Digital
Panel Meter, found in RMC 1ST, converts analog meter inputs to
---
digital format prior to being sent as telemetry to the Studio Unit.
UART--Universal Asynchronous Receiver Bnd Transmitter, 40 pin integrated circuits
----
used to convert digital data from serial to paraLlel and/or parallel to
serial formats.
LOW TTL LOGIC LEVEL-- zero to O.8VDC.
HIGH TTL LOGIC LEVEL--l.S to 5.0 VDC.
DIGITAL-- Circuits which contain information in the form of High and Low levels,
frequencies expressed as squared or pulsed waves.
ANALOG--Circuits not restricted
co logic levels, frequencies expressed as symetrical
non-square waves.
PARALLEL
FOR}~T--Logic
levels expressed in a number of circuits at the same time.
BCD--Binary Coded Decimal, four lines with values of 1,2,4, and 8 in which high
logic on certain conbinations of these are used to represent the numbers
from zero to nine.
SERIAL FORMAT--Digital sequence in the form of a word beginning with a low level
start bit, followed by a series of information bits corresponding to a
number of parallel inputs, ending by a high logic stop bit, and may be
followed by high logic interval before next start bit.
DCD--Digital Data in Serial Format, Direct CUrrent Data.
FSK--FreQuency Shift Keying, uses alternate transmission of two adjacent fre-
---
quencies to represent high and low logic levels.
MODEM--Contraction of Mod and Demod.
MOD--Converts DCD to FSK, short
·for
modulator.
DEMOD-- Converts FSK to DCO, short for demodulator.
RECEIVE OR TRANSMIT CLOCK--Digital Frequency at sixteen times the rate of the bits.
WORD--A serles of bits in the format LXXXXXXXXH, used as the
control
word.
DOUBLE WORD--A serles of bits 1n the format LXXXXXXXXHLXXXXXXXXH, used as the
telemetry word.
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