If you cannot find a working driver, consider replacing the Pb2 with a modern USB-to-serial converter (e.g., Moxa UPort 1150) and reconfigure your POS application to bypass the Pb2's proprietary handshake.
A driver acts as the translator between the operating system (OS) and the Pb2 terminal. Without the specific driver: Driver Citic Pb2
Critical Note: Many users mistakenly install a generic HID keyboard driver. This is incorrect. The Citic Pb2 requires a vendor-specific driver that supports the proprietary TLV (Type-Length-Value) protocol for encrypted PIN blocks. If you cannot find a working driver, consider
Even with the correct Driver Citic Pb2, problems arise. Here is a diagnostic table: A driver acts as the translator between the
| Error Message / Symptom | Likely Cause | Solution | | :--- | :--- | :--- | | "Device descriptor request failed" | USB cable too long or faulty | Use a certified USB 2.0 cable shorter than 3 meters. | | "Code 10: Device cannot start" | Conflicting driver (usbser.sys) | Go to Device Manager → Right-click Pb2 → Update driver → Browse my computer → Let me pick → Select "CITIC USB Device" from the list. | | COM port disappears after reboot | Power management | Open Device Manager → Properties of Pb2 COM port → Power Management → Uncheck "Allow the computer to turn off this device." | | "Driver is intended for Windows XP" | 64-bit vs 32-bit mismatch | The old Pb2 driver is 32-bit only. Use a 32-bit Windows VM or install the 64-bit community patch (search "Pb2 x64 signed driver"). | | Printer prints gibberish | Baud rate mismatch | Change the Pb2's internal dip switch #3 to match 9600bps, then restart. |
Before discussing drivers, it is crucial to understand what the CITIC Pb2 actually is. The Pb2 is not a standalone printer; it is a peripheral control board or an interface converter. It typically acts as a bridge between a standard PC (COM/LPT/USB) and a fiscal printer or cash drawer.