ATEN IC-485AI, Руководство пользователя

Страница: 17 / 24

- 17 -
RS-422 / RS-485 Installation Diagrams
RS-422 Full Duplex
Note: When the distance between both ends of the installation
is large and/or the transmitted signals are unstable,
insert 120
Ω
terminal resistors between pins 1 and 2 and
between pins 3 and 4 on the terminal blocks of the two
units at each end of the installation.
RS-485 Half Duplex
Note: When the distance between both ends of the installation
is large and/or the transmitted signals aren’t stable,
insert a 120
Ω
terminal resistor between pins 1 and 2 on
the terminal blocks of the two units at each end of the
installation.
Primary
T+
T -
R -
R+
Secondary 31
R+
R -
T -
T+
Secondary 1 Secondary 30
4,000'
Primary
T+
T -
R -
R+
Secondary 31
R+
R -
T -
T+
Secondary 1 Secondary 30
4,000'