VRC2000 Installation and Operations Manual Page 5
Technical or Setup Assistance
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control (such as during setup; see VRC2000 Setup, Page 10).
7. Metering. This DB37 connector serves as the metering communication
link between the VRC2000 and the site equipment.
8. COM Port. This DB9 connector serves as the serial link between the
VRC2000 and a PC.
9. Status. This DB37 connector serves as the status communication link
between the VRC2000 and the site equipment.
10. Command 1–8. This DB37 connector serves as the command link (for
the first eight command channels) between the VRC2000 and the site
equipment.
11. Audio In/Out. These standard BNC connectors provide unbalanced, four-
wire interconnection, such as for two-wire radio.
12. Command 9–16. This DB37 connector serves as the command link (for
the second eight command channels) between the VRC2000 and the site
equipment.
Remote/Local Modes
The standard mode of operation for the VRC2000 is remote mode. This
allows users connected via dial-up telephone line to remotely control the
VRC2000 and issue commands.
However, suppose that the site engineer needs to perform maintenance on site
equipment. To do so, he must press the REMOTE/LOCAL button [3] (See
Figure 3, previous page.) on the VRC2000’s front panel (the button will light
red, indicating that the VRC2000 is in local mode). In this mode, the
VRC2000 is suspended from issuing command outputs, unless issued by the
DTMF telephone connected to the VRC2000’s SET jack [6] (Figure 4,
previous page). When in the local position, the VRC2000 provides direct
current to the telephone set through the SET jack, allowing use of the DTMF
pad to key in programming tones to set up the VRC2000. In other words, in
local mode, the VRC2000 can be programmed or operated directly, without
connecting through a dial-up telephone line. However, metering and status
information is still available, as before.
REMOTE/LOCAL NOTE:
Switching the VRC2000 to local mode during maintenance of site equipment is
critical. If the engineer was working on site equipment and the remote location
evoked a command channel connected to the site equipment, the engineer could
possibly be injured.
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