Videotec NXPTZT - Manual (Page 22)

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22 MNVCNXPTZT_1343_EN
7.2.5.1 Two-way RS-485 TX/RX line
With this type of setting it is possible to obtain a
bi-directional, half/duplex, communication on the
RS-485-1 line.
The RS-485-2 serial line is not used.
RS-485-1
TX/RX
Control
keyboard
Fig. 19
7.2.5.2 Line RS-485-1 reception, line RS-485-
2 repetition
With this type of setting it is possible to connect more
than one device in cascade. The signal is repeated
from every unit, making it possible to markedly
increase total distance.
It only works with mono-directional
protocols.
This configuration does not allow the
remote updating of the firmware.
RS-485-1 RS-485-1 RS-485-2
Control
keyboard
Fig. 20
7.2.5.3 Two-way RS-422 line
This setting allows full duplex communication
according to the RS-422 standard.
Line RS-485-1 is always in receiving mode (RS-422-
RX).
Line RS-485-2 is always in transmission mode (RS-
422-TX).
RS-485-1 RS-485-2
Control
keyboard
Fig. 21
7.2.5.4 One-way RS-485 line
The first line (RS485-1) will operate according to the
settings in the Address, Baudrate and Protocol dip-
switch.
The RS-485-2 serial line is not used.
It only works with mono-directional
protocols.
This configuration does not allow the
remote updating of the firmware.
RS-485-1
Control
keyboards
Fig. 22