Fig 4. Connection of ADA-4020 to a PC by the use of RS232 to RS485/422 ADA-I1040 converter
Fig 5. Connection of ADA-4020 to a PC by the use of RS232 to RS485/422 ADA-I1040 converter
3.3. CONNECTION TO RS485/422 BUS
RS485/RS422 interface at ADA-4020 converter is available on terminal block described as: Tx+/A, Tx-/B, Rx+, Rx-.
Types of connection the ADA-4020 converter to RS485(4W)/RS422 and RS485(2W) networks are shown below.
3.3.1. CONNECTION TO RS485 4-WIRES BUS
After connection devices according to figure below, ADA-4020 should be setted to operate on RS485 network.
Fig 6. Example connection of the ADA-4020 to RS485(4W) 4-wire network and galvanic separation of SLAVE device
6
ADA-4020
(5) GND
GND
(2) Rx
(3) Tx
RS232
Connector
DB-9F/DCE
RS485/422
Terminal block
RS485(4W)
RS232
connector
DB-9M/DTE
PC
ADA-I1040
GND (5)
Tx (2)
Rx (3)
Rx+
Rx-
Tx+/ A
Tx-/ B
Tx+ / A
Tx- / B
Rx+
Rx-
Rx-
Tx-
GND
Rx+
Rx+*
ADA-4020
Tx+
RS485/422
Terminal block
Current Loop
Terminal block
(5) GND
GND
(2) Rx
(3) Tx
RS485(2W)
PC
ADA-I1040
GND (5)
Tx (2)
Rx (3)
Rx+
Rx-
Tx+/ A
Tx-/ B
Tx+ / A
Tx- / B
Rx+
Rx-
Rx-
Tx-
GND
Rx+
Rx+*
ADA-4020
Tx+
RS232
Connector
DB-9F/DCE
RS485/422
Terminal block
RS232
connector
DB-9M/DTE
RS485/422
Terminal block
Current Loop
Terminal block
(5) GND
GND
(2) Rx
(3) Tx
RS232
connector
DB-9F/DCE
Screw
connector
RS485 / RS422
RS485(4W) bus
RS232
connector
DB-9M/DTE
PC or
MASTER device
ADA-I1040
GND (5)
Tx (2)
Rx (3)
Rt
Rt
Rx+
Rx-
Tx+/ A
Tx-/ B
CL
SLAVE-2
SLAVE-3
SLAVE-1
CL
CL
