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ADA-1040PC9
3.4.2. CONNECTION OF KDU-110 DEVICE TO RS485(2W) MODBUS-RTU BUS
MASTER MODBUS-RTU
device
RS485 / RS422
connector
Tx+/ A
Rt
Tx-/ B
Rx+
GND
Computer or
MASTER
MODBUS-RTU
device
Fig. 8. Example connection of KDU-110 device by the use of ADA-1040PC9 to RS485(2W) 2-wire bus.
3.4.3. 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.
3.4.4. 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 Fig. 5 & 6. Two Rt = 120 W , 5%, 0,25W are delivered with the converters.
3.5. POWER SUPPLY CONNECTION
To connect power supply to the converter, should have DC power supplies (regulated) 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-1040PC9 has protection against power supply reverse connection.
4. ACTIVATION
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.
AT BAUD RATE ABOVE 38.4 KBPS THE LED'S TX, RX WILL LIGHT WEAKLY DURING DATA TRANSMISSION
4.1. DESCRIPTION OF SIGNALLING LEDS
LED
PWR
Signalling of Power Supply
RX
Signalling of data receiving through ADA-1040PC9 from RS485/RS422 port – MODBUS-RTU
TX
Signalling of data transmitting from ADA-1040PC9 through RS485/RS422 port – MODBUS-RTU
Not light – signalling of normal operating mode (RUN)
Blinking at frequency 1 Hz - signalling of configuration mode or software data flowing to the converter
Yellow LED by
SW1
Blinking at frequency 2 Hz - signalling of factory default mode
Lit continuously – signalling of emergency firmware update
RS485(2W) bus
19200Bd/8/N/1
MODBUS-RTU
Rx-
SLAVE-1
MODBUS-RTU
SLAVE-2
MODBUS-RTU
RS232
4800Bd
ATTENTION!!
Description
7
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