Talkaphone IW-HFM-4 Interview Window 4-Button Master - Manual (Page 7)

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Talk-A-Phone
Co. • 7530 North Natchez Avenue • Niles, Illinois 60714-3804 Page 7 of 13
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Figure 5. First Interface Box Wiring
8. Connecting Paging Bus Cable to Intermediate IW-IB-6 Interface Box
On the white terminal block included with the Interface Box, connect all wires from the
paging bus cable from the previous Interface Box to similar wires from the Interface Box
as shown in Figure 6 below. Then connect an identical set of paging bus wires to the
same terminals as the first set and continue this cable to the terminal block of the next
Interface Box. Note that the shields coming from the Interface Box should not be
connected and should be taped off to prevent shorting.
NOTE: As shipped, there are 620 Ohm, 1/2 watt resistors connected on each of the pairs
coming from the Interface Box. Be sure to remove these on all but the last Interface Box.
If a music/program source is being used, connect another shielded pair from the music
terminals on the Interface Box to the last three terminals on the terminal block. Then
run this cable to the next Interface Box terminal strip or, if the paging zone is to receive
its own music program, connect directly to the source. If this is the last (or only)
Interface Box to which the music source is being connected, connect a 620 Ohm, 1/2
Watt terminating resistor (included) between the black & yellow terminals on the
Interface Box side of the terminal block as shown below.