Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
RFL VF-15C RFL Electronics Inc.
August 7, 2012 8 (973)
334-3100
6. Set the module address using DIP switches SW9-1 through SW9-6 for the desired remote
address (SCB address).
For remote access, each channel module in the IMUX 2000 must have a distinct
module address. Valid addresses are the numbers “1” to “36”. In most
installations the address will be set to the number of the slot the module is
occupying. Table 2 shows the switch settings for the module address. (Consult
your multiplexer manual for details on using the remote access and configuration
features of the system.)
7. Select normal or enhanced mode using DIP switch SW9-7.
Place SW9-7 in the DOWN position for normal mode, or in the UP
position for enhanced mode. In normal mode the VF-15C emulates the parameters
of the older VF-15 series of modules. Enhanced mode allows remote programming
of Tx and Rx levels as shown in Table 3. It also allows a user to program signaling
delay for each channel remotely.
8. Select one-channel or two-channel operation using “CH2 OFF” DIP switch SW9-8.
Place SW9-8 in the UP position for two-channel operation, or in the DOWN
position for one-channel operation (Channel 2 turned off). Unless otherwise
specified at time of order, SW9-8 is set in the UP position at the factory for two-
channel operation.
9. Select the Tx and Rx audio levels using DIP switches SW1-2 through SW1-8, SW2-2 through
SW2-8, SW3-2 through SW3-8, and SW4-2 through SW4-8. These switches are used to alter
the translation between analog signal levels and digital data. Optimum performance is realized
when full scale analog swings are converted to nearly full-scale digital swings. The VF-15C is
designed to make this process simple if the analog input signal level and the desired analog
output signal levels are known.
The switches are binary coded with a minimum step size of 0.5 dB. An offset of 32 dB is
included to allow the signals to be attenuated or amplified. Table 3 shows the switch settings
for both the Tx and Rx level adjustments. The table only includes full dB steps for clarity.
Adjustments can be made in 0.5 dB increments by changing switch position 8 on the
appropriate switch. A Tx or Rx level can be set 0.5 dB lower by placing switch SWX-8 to the
UP position. For example, to set -25.5 dB, set SWX-2 through SWX-8 as follows:
U, U, U, D, D, U, U. Note that the level used to determine the switch setting should allow for
the maximum anticipated signal, or clipping may occur.
The switch encoding scheme is as follows;
a. Take the negative of the signal level. Most signal levels will be negative.
b. Multiply by two. This is to compensate for the 1/2 dB step size.
c. Add 40 hex (64 decimal).
d. Convert to binary, and then set the switches.
Note that for typical audio signals (for example -16 dBm) all that is required is to set the
switches for 32 (20 hex) while leaving switch 2 up (adding 40 hex). To maintain consistency
with earlier VF-15 modules, the factory default level setting is 0 dBm in and 0 dBm out
(switches set for 40 hex).
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