8
Selecting the "TV" (Video Termination) line termination
The bus line must be adjusted according to the cable used (impedance) and the installation topology of the
system. It is possible to use a twisted-pair cable at 100 Ω or a cable Cat. 5 (50 Ω).
The "TV video termination" dip switches on the back of the video door entry unit and near the 8-pin terminal
block must be set according to the instructions given in Fig. 3 and in the following table:
Position A No termination If the bus enters and exits the device
Position B Termination 100 Ω If the bus terminates in the device
Position C Termination 50 Ω If the bus terminates in the device
ON
12
ON
12
ON
12
ON
12
Figure 3 - Selecting the termination.
Position A
Position B
Position C
Functions of the video door entry unit
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