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ADA-4040A
3.3.2. RS485(2W) BUS CONNECTION
PC or
MASTER device
RS232
RS232
connector
connector
DB-9F/DCE
DB-9M/DTE
(2) Rx
Tx (2)
(3) Tx
Rx (3)
(5) GND
GND (5)
Fig 6. Example connection of ADA-4040A to RS485(2W) 2-wire bus and galvanic separation SLAVE device
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
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. You should use the Line Termination resistor if the distance is over 1000m @ 9600Bd or 700m @ 19200Bd
transmission. Example connection of Rt are shown on Fig. 5 & 6. Four Rt=120 W, 5%, 0,25W are delivered with the converters.
3.3.5. SLAVE DEVICE CONNECTION
Connection of SLAVE device to ADA-4040A is shown on fig.5 and fig.6.
3.4. CONNECTION OF POWER SUPPLY
The power supply of the converter should be done by the use of DC power supplies (regulated) output voltage from 10 V= to 30V=,
min. nominal power 2W, e.g. ZS-12/250 or DR-15-24. Power cable from DC power supplies to device can not be longer than 3m.
Should be connected positive (+) end of DC power supplies to Vss+ device terminal and negative (-) end to Vss- on terminal block.
ADA-4040A has protection against power supply reverse connection. If the power is properly connected, on the front panel will light
green LED PRW, if not check the power supply connection (polarization).
ADA-I1040
Screw
connector
RS485 / RS422
Tx+/ A
Rt
Tx-/ B
Rx+
Rx-
GND
RS422
RS485(4W) bus
9600Bd/8/O/1
RS485(2W)
SLAVE
9600Bd/8/E/1
7
RS485(4W)
SLAVE
2400Bd/8/N/2
SLAVE
19200/Bd/7/N/2
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