Abbreviations
| AFC | Automatic fare collection |
| AS | Authorization system; one of several data centers of the German banking industry that authorize disposals with eurocheque or credit cards. |
| BR / Host | Server / computer to which the POS terminals are connected. |
| cEMV | Contactless EMV |
| CVM | Card Verification Method |
| DHCP | Dynamic Host Configuration Protocol |
| DK | The German banking industry, the association of the Federal Association of German Volksbanks and Raiffeisenbanks, the Federal Association of German Banks, the Federal Association of Public Banks in Germany, the German Savings Banks and Giro Association and the Association of German Pfandbrief Banks represent the interests of the central banking associations. It emerged from the Central Credit Committee (ZKA) in August 2011 and continues its work. |
| DNS | Domain Name System |
| ec | electronic cash |
| ELV | Electronic Checks; Payment method with the bank card without entering a PIN and without a payment guarantee |
| EMV | Europay, Mastercard, Visa; Specification for smart card-based payment systems - published by Europay International S.A., MasterCard International Incorporated and Visa International Service Association |
| ESD | Electrostatic Discharge |
| IEC | International Electrotechnical Commission |
| ISO | International Standardization Organization |
| LAN | Local Area Network |
| MAC | Message authentication code; serves to secure a message against falsification and attacks |
| MDB | Multi-Drop Bus - Vending machine interface |
| mDNS | Multicast DNS |
| NFC | Near Field Communication |
| OPI | Open Payment Initative Also an abbreviation for a cash register / machine interface |
| PAN | Primary Account Number |
| PC | Personal Computer |
| PCI | also PCI-DSS: Payment Card Industry Data Security Standard, set of rules of the credit card organizations for processing credit card transactions with regard to the handling of sensitive data |
| PIN | Personal Identification Number; Secret number for the authentication of disposals with payment cards |
| PINPad | Keypad for secure PIN entry |
| PSD2 | Payment Services Directive, Europäische Zahlungsdiensterichtlinie 2 (2015/2366) |
| rfu | Short for "reserved for future use" |
| RS232 | Radio Sector 232: Standard for the PC serial interface |
| SCA | Strong Customer Authentication. Strong customer authentication is required when the user initiates an electronic payment. |
| SSL / TLS | Secure Socket Layer / Transport Layer Security |
| SNR | Serial number: Each terminal with cryptography must have a unique serial number, which it must specify during the initialization procedure. |
| TCP/IP | Transmission Control Protocol / Internet Protocol |
| TID | Terminal Number (Terminal ID) – 8 digits |
| TKM | Terminal-Configurations-Management; controlling the terminal configuration by configuration diagnosis transactions |
| TMS | Terminal Management System |
| USB | Universal Serial Bus |
| ZKA | Zentraler Kreditausschuss (german); Central Credit Committee; with its sub-organization "POS-Sicherheit" organ of the German banking industry, which grants the approval of the eurocheque card processing for network operators. Now: DK |
| ZVT | Zahlungsverkehrsterminal (german), Also abbreviation for the Poseidon interface description Also an abbreviation for a cash register / machine interface |