![background image](http://html1.mh-extra.com/html/omron/v690-series/v690-series_user-manual_741403047.webp)
4-2 How to Wire to Host Device
4-12
Internal configuration of the 1:1 connection of an antenna and host device through RS-422A (4-wire) is shown below.
• Signal lines (Rx, Tx and SG) of RS-232C are disconnected.
• If RS-422A is selected with the link unit, SD and RD of 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
Gr
oun
din
g
Cut in a connector.
Antenna
power
supply
switch
Setting switch
Link unit
When switching
RS-422A