Specifications

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GLOSSARY
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PBX: Post Branch Exchange.
POTS: Plain Old Telephone Service. See Telephone Line.
Push-On Block: A connector block that simplifies pin-for-pin
wiring between a VRC I/O unit and a Command Relay Unit or
Wiring Interface Unit. No soldering is required; the block uses
setscrews to lock down connections.
Remote Control System: Any system that is used to monitor
and control equipment from a distance. The VRC2500 is a remote
control system.
Remote Facilities Management: A more expansive term for
remote control system. It refers to a remote control that is
completely self-sufficient and self-monitoring, capable of
controlling complete facilities instead of only limited equipment.
RF Link: Radio-Frequency communications link. An RF link
refers to any modulated frequency communication between the
VRC software and any other system including the VRC2500. This
includes any sub-carrier generator/demodulator link using STL
transmitters and receivers, microwave communication, spread-
spectrum transceivers, etc.
RS-232: A standard DB9 serial connector used for connecting
data processing units and control systems.
Serial Cable: The cable which connects the PC to a VRC2500
unit or modem. See Null-Modem Cable.
Source Code: The textual representation of programming
instructions. With macros, the source code tells each macro how
to perform its function and may include logical statements,
functions, unit commands, and comments.
Telephone Line: In this manual, a telephone line is defined as
the line delivered by the telephone company to an individual
subscriber. Sometimes known as a POTS line, this is an analog
line required by modems or fax machines.
Wiring Interface Unit: The Wiring Interface is designed to
simplify connection of equipment to the VRC's I/O unit. It provides
easy pin-for-pin wiring using push-on blocks. Used for connecting
status and metering inputs only.