Rs422 / Rs485 Bus Connection - CEL-MAR ADA-M140 User Manual

ADA-M140

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.
PC
ADA-I9140
USB
interface
USB USB
Fig 4. 2-wires connection of converter to computer
ADA-M140
M-1 RS485/RS422
connector connector
Tx+ Tx+ / A
Rt
Tx- Tx- / B
GND-T Rx+
Rt
Rx+ Rx-
Rx- GND
GND-R
V -
V +
Power supply
Vss+
Vss-
Fig 5. Connection of converter to RS422 interface device
RS485/RS422
connector
Tx+
Rt
Tx-
Rx+
Rt
Rx-
GND
RS422
RS422
connector
bus
Tx+
Tx-
Rx+
Rx-
GND
6
ADA-M140
RS485/RS422 M-1
connector connector
Tx+ / A Tx+
Rt
Tx- / B Tx-
Rx+ GND-T
Rt
Rx- Rx+
GND Rx-
GND-R
V -
V +
Power supply
Vss+
Vss-
RS422
device
Rt
Rt