What is “Master Card” used for

For TR4030

If your TR4030 is never used, it will show a message that asks you to set a Master Card after powering it on. At the moment, the first card read by your TR4030 will become Master Card. The function of Master Card is to enter the programming mode of TR4030 for the setting purpose.

For TR4050

If your TR4050 is never used, it will show a message that asks you to set a Master Card after powering it on. At the moment, the first “registered” card read by your TR4050 will become Master Card. The function of Master Card is to enter the programming mode of TR4050 for the setting purpose.