TX can be a forward recharge or a reverse recharge. Positive top-up usually refers to transferring funds from bank card and other accounts to e-wallet or Alipay, while reverse top-up refers to transferring the balance of e-wallet or Alipay and other accounts to bank card and other accounts.
Specifically, when using an account such as a bank card to transfer funds to an account such as an e-wallet or Alipay, it is a positive recharge; When using an account such as an electronic wallet or Alipay to transfer the balance to an account such as a bank card, it is a reverse recharge. Therefore, TX can be either positive charge or reverse charge, depending on whether the funds are transferred in or out.
tx is transport and rx is receive, which is the output and input of your charger