Citizen CT-S601IIS3RSUBKP Thermal POS Printer Top Exit Serial
Overview
The CT-S601IIS3RSUBKP is a compact thermal printer designed for point-of-sale and receipt-printing environments where space constraints and direct thermal output matter. The Type II form factor delivers the CT-S600 series footprint with top exit paper path — paper exits directly upward, critical in tight counter installations where a rear-exit or side-exit path would jam into a wall or shelving. Serial (RS-232) connectivity keeps the printer compatible with legacy systems and integrated POS terminals that still rely on direct serial communication rather than USB or Ethernet.
Compatibility
The CT-S601IIS3RSUBKP integrates with any POS system, terminal, or register that supports RS-232 serial communication and 80mm-width thermal media. Verify your host device has an available serial port (9-pin or null-modem configuration) and confirm media compatibility — this printer accepts standard thermal paper rolls up to 80mm width. It is compatible with legacy cash register systems, kitchen display systems (KDS), and standalone POS terminals from the 1990s through 2010s that have not migrated to USB or networked interfaces.
Installation Notes
The top exit path requires clearance above the printer equal to the maximum media roll diameter plus at least 2–3 inches for paper feed and tear-bar access. Do not install in a ceiling-tight counter slot. Serial pinout (pin 2, 3, 5 on the 9-pin DE-9 connector) must match the host device wiring; if unsure, consult a null-modem diagram or contact the system integrator. No external power supply is typically required if the printer draws power from the POS terminal via an internal 24V or 12V power lead; confirm polarity and amperage limits with your host device documentation.
