Videotec ULISSE MAXI - Manual (Page 28)

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7.4.5.3 RS485-1 line reception, RS485-2 line
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.
RS485-1
Max 1200m Max 1200m
RS485-1 RS485-2
Control
Keyboard
Fig. 54
j It only works with mono-directional
protocols.
7.4.5.4 RS485 TX/RX line
With this type of setting it is possible to obtain a
bi-directional, half/duplex, communication on the
RS485-1 line.
The RS485-2 serial line is not used.
RS485-1
Max 1200m
TX/RX
Control
keyboard
Fig. 55
j This function is only available for
bi-directional protocols (e.g. PELCO,
AMERICAN DYNAMICS, Macro, etc.).
7.4.5.1 RS485 RX line
The line RS485-1 will operate according to the
settings in the Address, Baudrate and Protocol
dip-switch.
The RS485-2 serial line is not used.
Personal
Computer
Max 1200m Max 10m
RS485-1 RS232
Control
Keyboard
Fig. 52
h The system is of the TNV-1 type, do not
connect it to SELV circuits.
7.4.5.2 RS422 line (RS485-1 RX and RS485-2
TX)
This setting allows full duplex communication
according to the RS422 standard. This means that
both the RS485-1 and RS485-2 lines are used.
Max 1200m
RS485-1 RS485-2
Control
Keyboard
Fig. 53
j This function is only available for
bi-directional protocols (e.g. PELCO,
AMERICAN DYNAMICS, Macro, etc.).