send serial command

Hello,

i have an Arduino, and a RFID Tag Reader. i need to send a “SD1” command to the RFID Reader to set its reader to T55xx tags.

Urgent Help :’( , how do i send this command to the RFID reader??

Thanks

hanish:
how do i send this command to the RFID reader??

Type it into the Arduino Serial Monitor?

Your problem description is very unclear.

Is the reader and the Arduino a single system to which you want to send data?
OR
Do you want the Arduino to send data to some RFID device?
If so, what is the device (post a link to its datasheet)
How is the device connected to the Arduino?

Post the code that you have tried

...R