VRC2000 Installation and Operations Manual Page 95
Technical or Setup Assistance
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Current Samples To change the metering-channel inputs to read current (rather than voltage),
properly place a Berg shorting jumper across the desired metering channel’s dual-
row post.
Data Interface This accessory includes a 2,400bps internal modem plus a RS232 serial COM port.
See Appendix C: Accessories (Page 100).
Default Command ChannelsAny command channel can be tied to any metering channel. This allows
commands to be issued immediately after requesting information about a metering
channel.
Dial-Tone Wait Some older telephone systems or systems with poor quality lines do not have
reliable prevision dial tone. In such cases, the VRC2000 can be programmed to
wait six seconds before beginning to dial an outbound telephone number.
Disarm Functions See Mute Functions.
DTMF Dual-tone multi-frequency (touch-tones by AT&T) for dialing on the phone system.
FCC Registration Number The VRC2000 us registrered with the FCC, and is governed by FCC Rules and
Regulations Part 68 regarding devices to be connected to the switched telephone
network. The FCC registration number and ringer equivalency numbers appear on
a printed label attached to the VRC2000 chassis.
First Low Limit The first low limit is the low value closest to the nominal value set for each
metering channel. See also Tolerance Limits.
First High Limit The first high limit is the high value closest to the nominal value set for each
metering channel. See also Tolerance Limits.
Four-Wire Connections Using a four-wire connection, all VRC2000 functions can be accessed with a
dedicated line. The DTMF tones required for VRC2000 operation will be sent over
this hard-wired circuit via two BNC connectors on the back panel.
Inactivity Timer When the inactivity timer is active, the VRC2000 must receive at least one valid
DTMF command every five minutes or it will automatically exit set-up/user/
operator mode. If the inactivity timer is inactive, the unit will exit set-up/
operator mode after one hour if it has received no DTMF commands; user mode
will only be exited when the line is properly hung up or the user has properly
signed off.
Indirect Meter Readings A metering channel defined as an indirect output multiplies the readings of the two
previous consecutive metering channels together. Indirect inputs are used
primarily to calculate power readings.
Internal Lithium Battery See Battery.
Latching A control signal (in this case, a command-channel output) that remains in a fixed
state until you release it. This is opposed to a momentary control which is a pulsed
signal.
LED Light Emiting Diode. A semiconductor diode used in an electronic display that
emits a light when subjected to an applied voltage.
Linear Metering Readings A metering channel defined as a linear input multiplies the sample voltage by a
mathematical constant. See also Calibration Constant.
Local User Mode Local modes are used when you are on-site with your VRC2000. User modes allow
readings to be taken from metering/status channels, and commands to be issued via
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