Only if you post your code and the schematic of the interface you have wired up.
It also helps if you have a data sheet, all those you posted do not give enough information about the data format expected.
There is no mention of what baud rate it is using or how to switch between RS485and Wiegand.
For example is the device sending tag information only or does it have to have something sent to it to enable certain modes.
Also have you shorted the green and grey wires together?
I notice it says:-
Reliability Thunder protected, water proof and striking resistant,
Thunder resistant is easy, few electronic devices are frighted of loud noises.
i already attach picture of connection of rfid to arduino.
No you didn't.
But thanks for doing so now. It looks like that is wired up correctly?
i dont know how to troubleshoot.
So you look with an oscilloscope at the yellow or blue line and see if you can detect any activity.
If you can measure the signal and try and determine the baud rate. Then set the same baud rate in your sketch.
Then look at the R out signal into the Arduino, is this the right way up for TTL serial data. That is when there is no activity the line sits high? If not then swap over the yellow and blue wires.
You still need a proper data sheet, those you have posted already are not good enough.
So you look with an oscilloscope at the yellow or blue line and see if you can detect any activity.
If you can measure the signal and try and determine the baud rate. Then set the same baud rate in your sketch.
Then look at the R out signal into the Arduino, is this the right way up for TTL serial data. That is when there is no activity the line sits high? If not then swap over the yellow and blue wires.
So is it the right way up and what is the baud rate?
Baud rate is 38400..
Just wire it up like you showed. You might want to use one of the Mega's other serial ports like 1, 2 or 3.
i just connected the wire to serial port 0 (TX 0 & RX 0). But i don't know how to read, is it normal serial print?
i tried normal serial print,but no data.
The serial port 0 is already connected to the USB to serial converter so you can't use that.
You read with a serial read command not a print.
Look up serial read in the referance, if you still have trouble then post your code. Use code tags.
i already tried serial read in Arduino, but i could not get any reading from arduino serial print.
Then i used HyperTerminal software , i managed to get the reading. I attach the reading from HyperTerminal software below.
Do you have any sample arduino coding for serial read or any related to this RFID reader?