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[on:]

Hello,
I want to interface fingerprint module SM-630 with arduino and tell me how to write command

[Reply #1 on:]

You need to ask much more and better questions, and also point to or provide more information.

Where is information about the Fingerprint module?

What actions do you want to take?

What decisions do you need to make?

Then you can start thinking about Software Sketch code....

[Reply #2 on:]

Duplicate post deleted.

[Reply #3 on:]

 i used SM 630 fingerprint module...
and we want to store and interface, fingerprint of the users in pc through arduino...


here i attach the datasheet of our fingerprint module SM630...

pls reply me as soon as possible as we want to interface with arduino... 

[Reply #4 on:]

TTL serial, well-documented command set with examples, wide voltage range so should be simple.
I'd start by testing the "read product flag" command.
What's holding you up?

[Reply #5 on:]

i didnt get what u say AWOL....can u elaborate again..??

[Reply #6 on:]

TTL serial, well-documented command set with examples, wide voltage range so should be simple.
I'd start by testing the "read product flag" command.

The device has a TTL serial interface, so the connecting it to an Arduino should be simple. Don't forget the 10kohm pullup mentioned in the datasheet.
The command set is simple and well-documented, and examples are provided.
The supply voltage is within the Arduino's range.

There is a command called "read product flag", which looks like a sort of "Who are you?" command, so that would be the one I'd try first.

You might want to look at the SoftwareSerial library to begin with.