FloBoss 407 Instruction Manual
G-2 Rev 5/00
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 — Distinct or non-connected elements. 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.
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 — Serial Communications Protocol using three or more signal lines, intended for short
distances.
EIA-422 — Serial Communications Protocol using four signal lines.
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.
EMF — Electro-motive force.
EMI — Electro-magnetic interference.
ESD — Electro-static discharge.
EU — Engineering Units. Units of measure, such as MCF/DAY.
F
Firmware — Internal software that is factory-loaded into a form of ROM. In the ROC or FloBoss,
the firmware supplies the software used for gathering input data, converting raw input data
calculated values, storing values, and providing control signals.
FlashPAC — ROM and RAM module that contains the operating system, applications firmware,
and communications protocol in a ROC300-Series unit.
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). Also called Flash memory.
FloBoss — A specialized Remote Operations Controller (ROC), Fisher Control’s microprocessor-
based unit that provides remote monitoring and control.
FM — Factory Mutual.
FSK — Frequency Shift Keyed.
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