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.