Glossary of Terms
G-2 Rev 2/01
DCD — Data Carrier Detect modem communications signal.
Deadband — A value that is an inactive zone above the low limits and below the high limits. The
purpose of the deadband is to prevent a value such as an alarm from being set and cleared
continuously when the input value is oscillating around the specified limit. This also prevents the
logs or data storage location from being over-filled with data.
DI — Discrete Input.
Discrete — Input or output that is non-continuous, typically representing two levels such as on/off.
DO — Discrete Output.
DMM — Digital multimeter.
DP — Differential Pressure.
DSR — Data Set Ready modem communications signal.
DTR — Data Terminal Ready modem communications signal.
Duty Cycle — Proportion of time during a cycle that a device is activated. A short duty cycle
conserves power for I/O channels, radios, etc.
DVM — Digital voltmeter.
DVS — Dual-Variable Sensor. Provides static and differential pressure inputs to a FloBoss 503 Flow
Manager or eFlow EF-Series Flow Computer.
E
EEPROM — Electrically Erasable Programmable Read Only Memory, a form of permanent memory.
EFM — Electronic Flow Measurement.
EIA-232 — Serial Communications Protocol using three or more signal lines, intended for short
distances. Also called RS-232.
EIA-422 — Serial Communications Protocol using four signal lines. Also called RS-422.
EIA-485 — Serial Communications Protocol requiring only two signal lines. Can allow up to 32
devices to be connected together in a daisy-chained fashion. Also called RS-485.
EMF — Electro-motive force.
EMI — Electro-magnetic interference.
ESD — Electro-static discharge.
EU — Engineering Units.
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