Gentner VRC2000 - Step 8 - Two-Way Radio Connection

VRC2000 Installation and Operations Manual Page 73
Technical or Setup Assistance
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Two-Way Radio Connection (below). If your application would benefit from
four-wire connection, follow the step-by-step instructions below.
Dedicated four-wire circuits are available through two BNC connectors on
the rear panel of the VRC2000, labeled AUDIO IN and AUDIO OUT [11].
For electrical specifications, see Specifications (Page 90).
The VRC2000 can be set up to always be online by programming the ring
count to be zero. In the dedicated mode, send tones to the VRC2000 through
the AUDIO IN port, and listen for responses through the AUDIO OUT port.
The AUDIO OUT port can also be connected to an audio amplifier for easy
monitoring of VRC2000 reporting.
Step 8 — Two-Way Radio Connection
A two-way radio system can be connected to the VRC2000, eliminating the
need for any standard telephone line. All VRC2000 functions can be accessed
with a two-way radio. In other words, the VRC2000 will perform the same
functions over a two-way radio link as it will over a standard dial-up
telephone line.
If, however, your application does not require two-wire radio connection,
installation is complete; continue to Operation (next page). If your
application does require two-wire radio connection, follow the instructions
below.
At your remote site, connect your two-way radio receiver to the VRC2000
using the two BNC connectors on the VRC2000 rear panel, labeled AUDIO
IN and AUDIO OUT [11].
Connect audio to be decoded by the VRC2000 to the AUDIO IN connector.
Connect audio to be sent to the control site to the AUDIO OUT connector.
For electrical specifications, see Specifications (Page 90).
A Push-To-Talk (PTT) output appears on pin 19 of both command-channel
output connectors [10, 12] on the VRC2000’s rear panel. These outputs are
active low whenever the VRC2000 has data in its voice buffer (when the unit
has information to report) or when the Data Interface is activated.
AUXILIARY AUDIO CONNECTION NOTE:
It is possible to use the auxiliary audio connections on the rear panel of the
VRC2000 and the unit’s built-in telephone coupler at the same time. However,
the VRC2000 cannot assign a priority to either connection. In the case of two
simultaneous incoming signals, the unit will be unable to decode the DTMF tones
coming in over either connection.
At the control site, a DTMF generator must be supplied and properly
connected to the two-way radio transmitter. Use a standard telephone
instrument, a modem or other type of auto-dialer.
The VRC2000 will automatically come online when it receives the
engineering DTMF tones “A B”, in that sequence or “* #”.
DTMF GENERATOR NOTE:
The DTMF generator you supply must be capable of producing the “A B C D”
series of engineering tones in order to properly use the VRC2000 over a two-way
radio connection.