GE TruVision DVR 20 User Manual page 19

49BChapter 2: Installation
Incorrect
Use an RS-485/KTD-83 signal distributor to increase the maximum number of devices
on the bus as well as the total range. Each distributor output provides another RS-
485 bus, extending the output an additional 1200 m. Up to 31 TVR 20s can be
connected to each output. See Figure 9 below.
Figure 9: Expanding the system with an RS-485 signal distributor
Caution: Most signal distributors are unidirectional. This means that the signal only
flows from the input towards the outputs. Consequently it is not possible to connect
several keypads.
See "RS-232 and RS-485 port settings" on page 96 to configure the RS-485 port
communication settings.
TruVision DVR 20 User Manual 15