P a g e | 11
Progressive Automations – Position Control Communication Protocol
PIN NUMBER(COLOR)
PIN NAME
FUNCTION(RS485)
1(Yellow)
D-
RS485 –
2(White)
D+
RS485 +
3(Red)
VCC
Power +
4(Black)
GND
Power -
RS-485 - 4Pin Connector for PA-12-R
If power is supplied from the outside, you can connect to 485 D+, 485 D- only.
You can convert Tx and Rx mode by controlling “Direction_Port” pin in the circuit above.
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When the level of "direction_port" is LOW: Rx will receive Data.
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When the level of "direction_port" is HIGH: Tx will transmit Data.
Both GNDs between the actuator and controller should be connected as seen in the diagram.
Our PA-12-R uses RS-485 communication. For RS-485 type actuators, we recommend using the MAX485 chip as a buffer
between a full-duplex controller and the half-duplex PA-12 device. Of course, communication devices that are themselves
half-duplex would have no problem communicating with PA-12 directly. For example, the Allen-Bradley 1769-ASCII PLC
module can communicate with the PA-12 directly.
