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4-2 How to Wire to Host Device
4-15
Internal configuration of the 1:N connection of an antenna and host device through RS-485 (2-wire) is shown below.
• Signal lines (Rx, Tx and SG) of RS-232C are disconnected.
• If RS-485 is selected with the link unit, the terminating resistance (220
Ω
) can be turned ON/OFF.
Microwave
antenna
Station No. 00
Link unit
RS-422A/485 link
unit connecting
cable
Power sup-
ply circuit
Setting
mode
Antenna
RS-422A circuit
RS-232C circuit
Cut in a connector.
Antenna
power
supply
switch
Setting switch
Link unit
When switching
RS-485
G
rou
nd
in
g