Which mode of data transmission is used in point of sale terminal?

When a credit card or debit card is used to pay for something, a conventional point-of-sale (POS) terminal first reads the magnetic strip to check for sufficient funds to transfer to the merchant, then makes the transfer. The sale transaction is recorded and a receipt is printed or sent to the buyer via email or text.

How does a POS card work?

A point-of-sale (POS) terminal is a computerised replacement for a cash register which can process credit and debit cards. A customer needs to enter a card PIN to complete the transaction using the PoS terminal.

Which mode of data transmission is used in point of sale terminals simplex or duplex?

Differences b/w Simplex, Half-duplex and Full-duplex mode

Basis for comparison	Simplex mode
Send/Receive	A device can only send the data but cannot receive it or it can only receive the data but cannot send it.
Performance	The performance of half-duplex mode is better than the simplex mode.

Which mode of data transmission is used in point of sale terminals simplex or half duplex?

Comparison Chart

Basis for Comparison	Simplex	Half Duplex
Direction of Communication	Unidirectional	Two-directional, one at a time
Send / Receive	Sender can only send data	Sender can send and receive data, but one a time
Performance	Worst performing mode of transmission	Better than Simplex
Example	Keyboard and monitor	Walkie-talkie

How much data does a POS system use?

Data Use with General Square Actions

Action	Approximate Data Usage
Signing in to Square Point of Sale	~ 8 kb of data
Declined payments	~ 4 kb of data
Completed payments	~ 10 kb of data
Issuing a refund	~ 4 kb of data