![background image](http://html1.mh-extra.com/html/omron/v690-series/v690-series_user-manual_741403022.webp)
2-3 RS-422A/485 Link Unit Model V690-L01
2-7
2-3-3 Function
This link unit functions as a relay to operate a host device and antenna through RS-422A/RS-485 communication. For an example of
internal circuit, refer to Section 4-2-2.
ANT PWR
SET UP
RS-422A/RS-485
RS-422A RD
(Receiving)
RS-422A SD
(Sending) RS-485
By setting it to ON,
the power is sup-
plied to the antenna.
By setting it to OFF,
the power is not sup-
plied to the antenna.
By setting it to ON,
the setting mode ter-
minals "+P" and "-P"
are short-circuited.
By setting it to OFF,
"+P" and "-P" are dis-
connected from each
other.
RS-422A and RS-
485 are switched to
each other.
For RS-422A, the termi-
nating resistance (220
Ω
) of RS-422A RD
(Receiving) is turned
ON/OFF.
For RS-485, the termi-
nating resistance can-
not be turned ON/OFF.
For RS-422A, the ter-
minating resistance
(220
Ω
) of RS-422A
SD (Sending) is
turned ON/OFF.
For RS-485, the ter-
minating resistance
is turned ON/OFF.
Correct Usage
Be sure to connect a grounding wire. Otherwise, an error may occur in an operation.
Do not touch any terminal when the power supply turns on. Otherwise, an error may occur in an
operation.
Do not disassemble it nor touch the inside when the power supply turns on. Otherwise, trouble
may be caused.
Connect a connector
(D-SUB 15-pin) of the
RS-422A/RS-485 link
unit connecting cable.
Indicator "RUN"
Turns on when the 24
VDC power supply
turns on.
Indicator "ANT PWR"
Turns on when 24
VDC is supplied to the
antenna.
Connect 24 VDC
power supply.
Ground accord-
ing to Class D.
Connect a communication
line of RS-422A/RS-485.
Switch Function