Specifications

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INSTALLATION & SETUP • CONNECTING EQUIPMENT
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3. In the Modem Programming window, select the bottom tab
labeled MultiTech MT2834BL.
4. Change the initialization string to
AT&SB19200&E0&E4&D2&W.
5. Click either Program as Studio Modem or Program as
Transmitter Modem depending on which modem you are
working with. A message window will indicate successful
programming.
6. Connect the second modem and repeat the programming
process.
Label your modem as transmitter or studio as soon as you finish
programming to ensure they do not get mixed up.
FOUR-WIRE MODEM CONNECTION
Begin by testing your four-wire modem on the bench. This allows
you to ensure that the modems are communicating and to
calibrate your RF equipment before you attempt remote operation.
Connect the modem using the instructions given by the modem
manufacturer.
RS-232 Interface
The serial interface port on the back of the modem is a DB25
female connector. Use the provided null-modem serial cable to
connect the modem to your PC or I/O unit. A four-wire modem
should always be connected to COM1 on the I/O unit, never to
COM2. See Four-Wire Installation Diagram on the next page.
The VRC unit must be power cycled before the modem is
detected and any outbound calls for alarms are made.
The RF audio channel
used for your connection
needs to handle 19,200
bps in both directions, or your
connection may be unnecessarily
slow or unreliable.
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The modem status needs
to be idle when you
program it. If the modem
immediately tries to connect, turn
it off, then back on while pressing
ENTER. Once the status reads idle,
press the “down arrow” two times.
This will step the modem down the
menu and prevent it from
connecting until it is returned to
the status screen.
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Please disregard the DIP
switch settings shown on
screen. They are for the
MT2834BL. The MT5600BL does
not have DIP switches.
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