Fig 4. 2-wires connection of converter to computer
3.3. RS422 / RS485 BUS CONNECTION
The RS485/RS422 interface at ADA-M140 converter is available on terminal block described as: Tx+/A, Tx-/B, Rx+, Rx-, GND. ADA-
M140 can operates on RS422 bus and RS485(4W) and RS485(2W). The both buses should be the proper wiring. Examples wiring are
shown on figures below.
Fig 5. Connection of converter to RS422 interface device
6
ADA-M140
Rx+
Rx-
GND
Tx+
Tx-
USB
USB
interface
RS485/RS422
connector
ADA-I9140
USB
PC
Rt
Rt
Rt
Rt
Rx+
Rx-
GND
Tx+ / A
Tx- / B
ADA-M140
RS485/RS422
connector
M-1
connector
Rx+
GND-R
Tx+
GND-T
Vss+
Vss-
V -
V +
Power supply
Tx-
Rx-
Rt
Rt
Rx+
Rx-
GND
Tx+
Tx-
RS422
device
RS422
connector
Rt
Rx+
Rx-
GND
Tx+ / A
Tx- / B
ADA-M140
RS485/RS422
connector
M-1
connector
Rx+
GND-R
Tx+
GND-T
Vss+
Vss-
V -
V +
Power supply
Tx-
Rx-
Rt
RS422
bus
