Brother International TD-4420TN FBPL Command Reference - Page 268

Sample code (2) This programming example writes a data with lock password into an RFID tag and reads the written data with a prompt. CLS RFID WRITE,1234,H,0,8,EPC,"20191008" RFID READ,0,H,0,8,EPC,"Date: " PRINT 1 Note: For this locked RFID tag, it cannot be overwritten data without using RFID READ unlock password command. If you re-send the RFID WRITE command, the printer LCD will be shown as below, To overwrite this locked tag, use RFID READ unlock command as following programming example, to unlock password for the RFID tag so it can be overwritten later. CLS RFID READ,1234,H,0,8,EPC,"Date: " PRINT 1 CLS RFID WRITE,0,H,0,12,EPC,"123456789012" RFID READ,0,H,0,12,EPC,"Read Data: " PRINT 1 263