Connection To Rs485/422 Bus; Connection To Rs485 4-Wires Bus - CEL-MAR ADA-4020 Series User Manual

ADA-4020
PC
RS232
connector
DB-9M/DTE
(2) Rx
(3) Tx
(5) GND
Fig 4. Connection of ADA-4020 to a PC by the use of RS232 to RS485/422 ADA-I1040 converter
PC
RS232
connector
DB-9M/DTE
(2) Rx
(3) Tx
(5) GND
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.
PC or
MASTER device
RS232 RS232
connector connector
DB-9M/DTE DB-9F/DCE
(2) Rx Tx (2)
(3) Tx Rx (3)
(5) GND GND (5)
Fig 6. Example connection of the ADA-4020 to RS485(4W) 4-wire network and galvanic separation of SLAVE device
ADA-I1040
RS232
RS485/422
Connector
Terminal block
DB-9F/DCE
Tx (2) Tx+/ A
Rx (3) Tx-/ B
GND (5) Rx+
Rx-
GND
ADA-I1040
RS232
RS485/422
Connector
Terminal block
DB-9F/DCE
Tx (2) Tx+/ A
Rx (3) Tx-/ B
GND (5) Rx+
GND
ADA-I1040
Screw
connector
RS485 / RS422
Tx+/ A
Rt
Tx-/ B
Rx+
Rt
Rx-
GND
CL
RS485(4W)
RS485(2W)
Rx-
RS485(4W) bus
CL
SLAVE-1
6
ADA-4020
RS485/422 Current Loop
Terminal block Terminal block
Rx+ Rx+
Rx- Rx+*
Tx+ / A Rx-
Tx- / B Tx+
GND Tx-
ADA-4020
RS485/422 Current Loop
Terminal block Terminal block
Rx+ Rx+
Rx- Rx+*
Tx+ / A Rx-
Tx- / B Tx+
GND Tx-
CL
SLAVE-2 SLAVE-3