Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
RFL VF-10D RFL Electronics Inc.
June 23, 2001 8 (973) 334-3100
5. Refer to Figure 5 and Table 1 for the location and function of DIP switches on the VF-10D.
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-10D emulates the parameters of the older
VF-10 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
remotely.
8. Select one-channel operation using “CH2 OFF” DIP switch SW9-8.
Place SW9-8 in the DOWN position for one-channel operation (Channel 2
turned off).
9. Select the Tx and Rx audio levels using DIP switches SW1-2 through SW1-8, SW2-2 through
SW2-8. 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-10D 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-10 modules, the factory default level setting is 0 dBm in and 0 dBm out
(switches set for 40 hex).
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