3.3. CONNECTION TO RS485/RS422 NETWORK
RS485/RS422 interface is available in ADA-14040 on screw terminal block, labelled as: Tx+/A, Tx-/B, Rx+, Rx-, GND.
ADA-14040 allows operation on the RS422 and RS485 Bus. Both buses require proper wiring.
3.3.1. CONNECTION TO 4-WIRE RS422 BUS
Before connection 4-wire RS422 Bus, should be set the MODE switch on the front panel of ADA-14040 in RS422 mode. Connect
wires of bus to terminals TX+/A, TX-/B, RX+, RX-, like below.
Fig 11. Example connection of device with RS422 interface to ADA-14040
3.3.2. CONNECTION TO 4-WIRE RS485(4W) BUS
Before connection 4-wire RS485 Bus, should be set the MODE switch on the front panel of ADA-14040 in RS485 mode. Connect
wires of bus to terminals TX+/A, TX-/B, RX+, RX- , like below.
Fig 12. Example connection of device with RS485(4W) interface to ADA-14040
3.3.3. CONNECTION TO 2-WIRE RS485 (2W) BUS
Most of the devices with RS485 interface, use 2-wire RS485 Bus for data transmission.
Before connection 2-wire RS485 Bus, should be set the MODE switch on the front panel of ADA-14040 in RS485 mode. Connect
wires of bus to terminals TX+/A, TX-/B, like below.
11
ADA-14040
RS422
Tx+
Tx-
GND
Rx+
Rx-
Rt
Rt
Rx+
Rx-
GND
Tx+
Tx-
Vss+
Vss-
SMA
Vss-
Vss+
Device with RS422
interface
Wi-Fi
RS422
Power Supply
ADA-14040
Rt
Rt
Rt
Rt
Rx+
Rx-
GND
Tx+ /A
Tx- /B
Vss+
Vss-
Wi-Fi
Vss-
Vss+
ADA-14040
SMA
connector
RS485(4W)
connector
Power Supply
