ROC364 Instruction Manual
G-2 Glossary Rev Jun/05
Duty Cycle – Proportion of time during a cycle that a device is activated. A short Duty Cycle conserves
power for I/O channels, radios, and such.
DVM – Digital voltmeter.
E
EDS – Electronic Static Discharge.
EEPROM – Electrically Erasable Programmable Read-Only Memory, a form of permanent memory.
EFM – Electronic Flow Metering or Measurement.
EIA-232 (RS-232) – Serial Communications Protocol using three or more signal lines, intended for
short distances.
EIA-422 (RS-422) – Serial Communications Protocol using four signal lines.
EIA-485 (RS-485) – Serial Communications Protocol requiring only two signal lines. Can allow up to
32 devices to be connected together in a daisy-chained fashion.
EMF – Electro-motive force.
EMI – Electro-magnetic interference.
EU – Engineering Units.
F
FCC – Federal Communications Commission.
Firmware – Internal software that is factory-loaded into a form of ROM. In the ROC, the firmware
supplies the software used for gathering input data, converting raw input data calculated values,
storing values, and providing control signals.
FlashPAC Module – Memory module (uses Flash ROM and RAM) that contains the operating system,
applications firmware, and communications protocol in a ROC.
Flash ROM – A type of read-only memory that can be electrically re-programmed. It is a form of
permanent memory (needs no backup power).
FSK – Frequency Shift Keyed.
FST – Function Sequence Table, a type of program that can be written by the user in a high-level
language designed by Emerson Process Management.
G
GFA – Ground fault analysis.
GND – Electrical ground, such as used by the ROC power supply.
GP – Gauge Pressure.
H
HART – Highway Addressable Remote Transducer.
hw – Differential pressure.
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