Fig 13. Example connection of device with RS485(2W) interface to ADA-14040
3.3.4. GND TERMINAL CONNECTION
Connection of GND terminals of RS485/422 interfaces, devices connected to RS485/422 bus, should be done in the case of a
potential difference of the signals grounds on interfaces RS485 / RS422, which prevents proper data transmission.
Cannot connect to the GND terminal - cables screens, PE circuit of electrical installation, signals grounds of other devices.
3.3.5. LINE TERMINATION
The application of Line Termination (terminator) Rt = 120 ohms on the ends of the Bus, will reduce electrical reflection in long data
line at high baud rate. It is not needed below 9600Bd. For over 1000m @ 9600Bd or 700m @ 19200Bd the line termination should be
used, if there are problems with proper transmission.
Example connection of Rt are shown on Fig. 10, 11, 12.
ADA-14040 Wireless Serial Server has two implemented terminators, connect to terminals Tx+/A – Tx-/B and Rx+ - Rx- by the use
SW1 microswitch (see table below).
SW1 section
Description
SW1-1
ON – connection Line Termination 120
W
to terminals Tx+/A - Tx-/B
OFF – disconnection Line Termination 120
W
from terminals Tx+/A - Tx-/B
SW1-2
ON – connection Line Termination 120
W
to terminals Rx+ - Rx-
OFF – disconnection Line Termination 120
W
from terminals Rx+ - Rx-
3.4. POWER SUPPLY CONNECTION
The power supply to the ADA-14040 should be DC (regulated) from the scope 10 V= to 30V= and nominal power more then 4W.
Power cable from DC power supplies to device must not be longer than 3m. Observe the polarity, connect positive (+) of DC power
supplies to V+ and negative (-) end to V- terminal. ADA-14040 has the protection from opposite connection power supply.
4. ACTIVATION
If connection was made properly green LED PWR on front panel of converter should lit, if not check polarization of connected power.
When data is transmitted LEDs on RJ45 connector and RX, TX should blink. This LED are show below:
LED
Description
Power
PWR
Signalization of Power Supply
RS485/RS422 interface
RX
Signalization of data receiving by ADA-14040 from RS485/RS422 port
TX
Signalization of data transmission from ADA-14040 through RS485/RS422 interface
Wi-Fi wireless interface
Yellow
Lights continuously – indicates the connection between ADA-14040 and the Access Point.
Flashing of low frequency - indicates work in "ad hoc" mode.
Flashing at a high frequency - network searches.
Green
Signalling data transmission
12
ADA-14040
Rt
Vss+
Vss-
Vss-
Vss+
ADA-14040
Rx+
Rx-
GND
Tx+ /A
Tx- /B
Wi-Fi
SMA
connector
RS485(4W)
connector
Power Supply
