ZKTeco Card Consumption POS Terminal ProMerc-20

The ZKTeco ProMerc-20 is a hanging card-consumption terminal for a managed MIFARE-card system. It records a transaction against data held on the card: the manufacturer describes the balance and consumption limit as encrypted on the card itself, with the result written back after use. This makes the card-data arrangement a central part of selecting the system, rather than treating the terminal as a general-purpose computer with an attached card reader.

Two three-inch colour displays provide the documented dual-screen format. The exact regional profile lists 30,000 cards and 100,000 records. Those are separate limits for registered cards and stored activity, not a promise of transactions per second or simultaneous users. The hanging construction also distinguishes the physical installation from a freestanding desktop POS; the fixing arrangement and cable access need to suit the actual counter.

The manufacturer describes the transaction function as offline consumption while also specifying network communication for the PUSHSDK connection. These statements address different parts of the system: card-based transaction data and communication with the management installation. An implementation should therefore define card issuance, balance updates and collection of transaction records together. Neither the offline description nor the record capacity establishes how an unconfigured terminal handles lost cards, reconciliation conflicts or interrupted updates.