AS608 fingerprint sensor

[Cea1420]

Hello, since I can't find documentation how to extract from the sensor to sql and import data from sql to the sensor to create, delete, read to test for fingerprint match, I'm going to use the storage of AS608 fingerprint sensor with a 127 fingerprints storage but seeing how much memory it takes for create,delete, read fingerprint ( I upload them one by one as I'm still waiting for the sensor to be delivered) I think one arduino nano isn't enough so I will connect the two arduino nano (tx-tx, rx-rx, gnd-gnd) but the problem is should I connect the sensor on both arduino nano as I don't know if I can enroll/delete when the sensor is connected to another arduino nano.

Im going to use c# winforms for this project and use serial communication to communicate on arduinos

And also I don't have idea if the fingerprint that is already enrolled will remain enrolled after restart/unplug of the system.

[Railroader]

Tx to Tx resp. Rx to Rx is wrong. Why connect a transmitter to another transmitter?
Look for example code or tutorials.
What will a receiver recieve from another reciever?

[xfpd]

Adafruit library example (fingerprint.ino) says this:

// For UNO and others without hardware serial, we must use software serial...
// pin #2 is IN from sensor (GREEN wire)
// pin #3 is OUT from arduino  (WHITE wire)
// Set up the serial port to use softwareserial..
SoftwareSerial mySerial(2, 3);

[Grumpy_Mike]

I would use a 1K 500R potential divider on the TX pin from the Arduino to protect the fingerprint circuit from too much voltage.