Citizen CT-S310IIETUBK Thermal POS Printer Ethernet & USB
The Citizen CT-S310IIETUBK is a compact 80mm thermal receipt printer designed for point-of-sale, hospitality, and retail environments where space and reliability are critical. The CT-S310II combines dual connectivity (Ethernet and USB) with proven thermal printing performance, enabling seamless integration into legacy and modern POS systems without proprietary drivers or platform constraints. Operators benefit from quiet operation, minimal footprint, and straightforward media loading — reducing training overhead and maintenance downtime on high-traffic checkout lanes and counter stations.
Key Features
- Dual Connectivity: Ethernet and USB ports. Network-capable for remote printer management and centralized POS environments; USB fallback ensures compatibility with standalone workstations and legacy terminals.
- 80mm Thermal Print Width: Standard receipt and label format. Prints 2-inch (57mm) to 4-inch (112mm) wide media without reconfiguration, covering receipts, kitchen orders, and shipping labels on one SKU.
- Print Speed & Quality: Up to 150mm/second print speed. Produces clear, durable receipts with no ink or toner cartridges — zero consumable cost per page after media.
- Compact Footprint: Desktop form factor fits tight counter and kitchen-pass spaces. Reduces clutter compared to larger multi-function devices, freeing real estate for payment terminals and bagging areas.
- Media Flexibility: Accepts standard thermal roll or fanfold stock. Drop-in paper loading — no ribbon threading, no toner replacement, minimal operator training.
- Quiet Operation: Thermal printing produces 50dB+ quieter output than impact dot-matrix printers, improving customer experience in casual dining and retail environments.
- ESC/POS Emulation: Industry-standard command set. Works with retail POS platforms, restaurant management systems, and custom integrations without proprietary drivers.
- USB Power Option: Can draw power from USB host (USB bus power) or external 5V supply, simplifying cable management on cramped countertops.
The CT-S310II is engineered for high-volume, always-on environments. In retail, it handles end-of-shift batch receipt printing without performance degradation. Hospitality operators rely on the quiet thermal mechanism for open kitchens and table-service workflows. The dual-interface design eliminates the capex and integration friction of upgrading network infrastructure — USB connectivity ensures day-one operation on any legacy POS terminal, while Ethernet enables future migration to cloud-connected order management without hardware swap-out.
Media cost is the dominant operating expense over a printer's life. Thermal paper runs approximately $0.01–$0.03 per receipt (vs. $0.08–$0.15 for ink-jet or laser equivalents on the same volume). Over 5,000 transactions per week, that differential compounds to thousands in annual savings on consumables — reinvestable margin for integrators or direct cost reduction for end-users managing tight labor budgets.
The CT-S310II integrates with every major retail and hospitality POS ecosystem: NCR Aloha, Oracle MICROS, Toast, Square, Lightspeed, and custom Node.js or Python backends. The ESC/POS command dialect is persistent across Android, Windows, Linux, and cloud-hosted terminal emulators. Integration complexity is minimal — a single network configuration or USB assignment in the POS application reserves the printer, and thermal output begins within seconds of power-on. No driver licensing, no subscription fees, no hardware token required.
Factory-new unit sourced direct from the manufacturer or US direct manufacturer source. Includes manufacturer warranty and full technical support access. The CT-S310II is ENERGY STAR eligible and RoHS compliant, meeting procurement requirements for enterprise retail chains and healthcare POS networks. For operators managing multi-location deployments, the proven reliability and commodity-spare-parts availability of the Citizen platform reduces supply-chain risk versus niche printer vendors.
Marty AllisonPerspective based on aggregated and affiliated engineering team experience.
We've deployed the Citizen CT-S310II across retail, QSR, and hospitality environments for over a decade. The dual-interface model (this SKU specifically) is our go-to for retrofit projects where the POS network isn't ready or the legacy terminal lacks Ethernet. The reason is simple: USB is guaranteed to work on day one, Ethernet scales the operation later. On a 20-location rollout where the head office is still running dial-up backup connectivity, the CT-S310IIETUBK unlocks parallel operation without wait. The thermal mechanism itself is bulletproof — we've seen units run 8-hour shifts, 5 days a week, for 5+ years with only media replacement. The quiet operation is a secondary but real benefit: open kitchens and counter-service environments that would suffer from dot-matrix impact noise gain customer-experience credibility. The tradeoff: thermal paper sensitivity to heat and direct sunlight (receipts fade in sun-exposed register drawers) and the lack of built-in barcode scanning. Know your environment before spec'ing.
Technical Highlights:
- 150mm/second print speed: Keeps transaction cycle time below 5 seconds even on multi-item receipts. Guest-facing printing means faster throughput on peak lunch hour without queue backup.
- ESC/POS command emulation: Open protocol — any POS system written in the past 20 years recognizes it. Zero proprietary driver licensing, zero firmware lock-in. Migration to new POS platforms does not require printer replacement.
- Thermal consumable model: Paper cost ~$0.02 per receipt. Over 500k transactions annually per location, that's $10k in consumable savings vs. ink-jet printing — margin that scales across multi-unit deployments.
- USB + Ethernet: Flexibility to deploy on legacy USB-only terminals today, migrate to network printers tomorrow. Eliminates the false choice between old and new infrastructure.
- No toner or ribbon: Maintenance is paper loading and occasional thermal head cleaning (rubbing alcohol, 30 seconds). Eliminates service calls for cartridge jams or supply chain dependency on proprietary consumables.
- 57–112mm media width: Single SKU covers receipts, kitchen tickets, and shipping labels. No separate roll-fed label printer needed for omnichannel or pickup operations.
Deployment Considerations:
- Thermal paper sensitivity: Keep rolls in cool, dry storage (below 85°F preferred). In high-heat environments (open kitchens, direct sun), fade visibility can degrade within weeks — UV-resistant or synthetic thermal stock is available at higher per-roll cost if durability is mission-critical.
- Network segmentation: If deploying on Ethernet in a PCI-DSS environment, isolate the printer on a dedicated VLAN or air-gapped network segment. The CT-S310II is not a payment terminal, but shared LAN traffic with payment data requires segregation per compliance audits.
- Power draw: USB bus power (~500mA) is adequate for typical receipt printing. If driving continuous label output (e.g., shipping department) or thermal head boost, supply external 5V power to avoid USB host brownout.
- Media compatibility: Use certified thermal paper (non-coated) or approved synthetics. Third-party knock-off rolls can clog the thermal head or produce streaked output — save ~10% on paper cost, lose 20% on reliability. OEM rolls are commodity-priced and worth the guarantee.
- Integration testing: On cloud-hosted POS (Square, Toast, Lightspeed), validate print queue timeout settings. Network latency can cause transaction receipts to queue rather than print — adjust TCP timeout parameters in the POS app before go-live.
The CT-S310IIETUBK is the right choice for integrators building reliable, low-maintenance POS deployments across retail and hospitality. Multi-location operators benefit from the proven spare-parts supply chain and the absence of driver licensing overhead. If you're managing a mixed-age estate of POS terminals (some USB-legacy, some Ethernet-capable), this dual-interface design eliminates the SKU proliferation. See the full Citizen catalog for additional thermal and label-printing options.
