DK 300 support supports RS-422/485 4wires full duplex by BOM option. This information is available in dk300 data sheet .
The DB9 pin out is as follows
|1||DCD = Input||CTS-- = Input||Not Used|
|2||RXD = Input||RXD+ = Input||RXD+ or Not Used|
|3||TXD = Output||TXD+ = Output||DAT+ (often B)|
|4||DTR = Output||RTS-- = Output||Not Used|
|5||GND, Signal||GND, Signal||GND, Signal|
|6||DSR = Input||RXD-- = Input||RXD-- or Not Used|
|7||RTS = Output||RTS+ = Output||Not Used|
|8||CTS = Input||CTS+ = Input||Not Used|
|9||Not Used||TXD-- = Output||DAT-- (often A)|
Please refer the link for more information.
Thanks. But this is just theory. If any one has tried reading data from RS 485( 2 wire ) from any industry grade controller using DK 300, please share results.
We were able to get results with RS 485( controller end) to USB converter ( DK 300 end ). But a direct 2 wire, RS 485 connection between controller and DK 300, yields no data or results. We were trying Modbus/RS 485.