3.3.3. GND TERMINALS 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.
3.3.4. LINE TERMINATION Rt
The application of Line Termination (terminator) Rt = 120 ohms will reduce electrical reflection in data line at high baud rate. It is not
needed below 9600Bd. Should be used the Line Termination resistor if the distance is over 1000m @ 9600Bd or 700m @ 19200Bd,
and if the disturbance in transmission will appear. Example connection of Rt are shown on the figures below. Four Rt=120
W
, 0,25W
are delivered with the converters.
3.4. POWER SUPPLY CONNECTION
We recommend for powering of ADA-4040PC8 to use individual, stabilized power supply with output voltage from 10 V= to 30V=, min.
nominal power 2W, e.g. HDR-15-24. Power cable from DC power supplies to device can not be longer than 3m. Should connect
positive (+) end of DC power supplies to V+ device terminal and negative (-) end to V- on terminal block.
ADA-4040PC8 has protection against power supply reverse connection.
4. START-UP
The converter can be power on after properly connection according to section above.
If after connection power supply on front panel will not light green led PWR, check correctness of power supply connecting
(polarization). When data is present the LEDs Tx and Rx should blink
ATTENTION!
AT BAUD RATE ABOVE 38.4 KBPS OF THE TX DIODE, MORE POORLY WILL LIGHT RX DURING THE DATA TRANSFER
4.1. DESCRIPTION OF SIGNALLING LEDS
LED
Description
PWR
Signalling of Power Supply
RX
Signalling of data receiving through ADA-4040PC8 from RTU RS485/RS422 port.
TX
Signalling of data transmitting from ADA-4040PC8 through RTU RS485/RS422 port.
Yellow LED by SW1
Not light – signalling of normal operating mode (RUN)
Blinking at frequency 1 Hz - signalling of configuration mode or data flow of software to the converter.
Blinking at frequency 2 Hz - signalling of factory default mode
Lit continuously – signalling of emergency firmware update
4.2. TROUBLESHOOTING
Problem
Solutions
PWR LED is not lit
Check polarization and parameters of connected power supply.
Rx LED lights
continuously
RS485(4W) /422 network. Wrong polarization on terminals: Rx+, Rx- RTU port; change polarization.
No transmission
Tx LED is blinking
RS485(4W) / RS422 network. Check correctness of connection to terminals Tx, Rx; according to
point 3 and the converter configuration.
5. CONFIGURATION
5.1. OPERATION MODE
ADA-4040PC8 converter can operates in and few modes:
●
RUN,
●
configuration,
●
factory default,
●
emergency firmware update mode,
Those modes can be set by use SW1 located by terminal block JCT port. To set the switch section, should remove terminal cover
marked as SW1 and make the appropriate settings by the use a small, flat screwdriver.
All available adjusting the SW1 switch are shown in table below.
Operation modes
SW1 - 1 SW1 - 2
Mode
Yellow LED
OFF
OFF
Run
Not lit
ON
OFF
Configuration
Flashes every 1 sec.
OFF
ON
Factory default
Flashes every 0,5 sec.
ON
ON
Emergency firmware update
Continuous light
7
ADA-4040PC8
