Page 108 VRC2000 Installation and Operations Manual
Technical or Setup Assistance
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VRC2000 Unit
The VRC2000 is a microprocessor-based system (MC146805E2) which
permits conventional remote control of broadcast transmitters and other
equipment as well as automatic transmission systems (ATS) operation. The
system’s internal Central Processing Unit (CPU) and memory circuitry allow
the VRC2000 to be set up by the user to make decisions and take actions
based on predetermined criteria, provide telemetry to the user, or to respond
to commands directly.
DTMF Control
The VRC2000 is primarily controlled by standard telephone DTMF signals.
When receiving instructions, the VRC2000 responds in plain English with
its internal digital-voice synthesizer. The VRC2000 has a vocabulary of
almost 800 words, numbers, prefixes, and suffixes. (See Appendix I,
Page 125.) You may program the VRC2000’s voice responses during the
set-up operation (VRC2000 Setup, Page 10).
An automatic telephone coupler is built into the VRC2000. This device
senses telephone company ringing and disconnect signals, providing
automatic connection to and disconnection from the dial-up telephone line.
The VRC2000 can also dial out to a preprogrammed telephone number with
either DTMF or pulse signals. The VRC2000 comes standard with
additional four-wire connections to allow use with almost any bidirectional
audio link.
The VRC2000 may be programmed to automatically dial to up to five
telephone numbers upon the presence of an alarm condition, using either
pulse dialing or DTMF. The system will also automatically answer incoming
telephone calls based on a programmed number of rings.
Real-Time Clock and Memory
The VRC2000 incorporates a highly accurate real-time clock and calendar.
Internal lithium battery maintains real-time clock and user memory
(non-volatile CMOS RAM). These allow the VRC2000 to tag registered
alarms with the time of day and date, and to perform automatic functions
according to the time of day, day of week or date.
Inputs
The VRC2000 contains a number of different types of inputs: metering,
status and command. These inputs (channels) can be connected to your
transmitter and/or other equipment to provide a complete and accurate
picture of how attached equipment is operating.
Metering Channels
The VRC2000 has 16 metering-channel inputs. These inputs accept an
analog voltage or current sample; the VRC2000’s internal circuitry converts
these samples into four-digit numbers, which the system can then report over
the telephone line. Each metering channel can be set up with four tolerance
(threshold) limits, two upper and two lower. You can also program the
system to issue an automatic command from any of these tolerance limits.
You may also set up the VRC2000 to recognize any tolerance limit as an
alarm condition.
Appendix E: Technical
Description
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