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Black desktop thermal receipt printer with top paper exit and built-in power supply

Citizen

Citizen CT-S310II-U-BK Receipt Printer 160 mm/s USB Serial

SKU CH-A0PN-9NGTW MPN CT-S310II-U-BK

A compact direct-thermal desktop printer producing receipts and barcodes at 160 mm/sec with dual USB and serial interfaces, paper-saving function and ENERGY STAR power supply

  • Memory size192K bytes for character, 384K bytes for graphic (Non-Volati
  • Interface typeSerial (RS-232C) (Connector: 9pin D-sub) + USB
  • Power drawPrinting: 32 W Sleep: 0.6 W, 0.18 W (USB power save mode)
  • Printing methodDirect Thermal
  • Printer categoryDesktop
  • Printing speed160 mm/sec
  • Print receipts quickly at 160 mm per second
  • Connect via USB or serial interfaces for flexible integration
  • Save up to 20 percent paper with built-in reduction function
  • Reduce power consumption by 45 percent with ENERGY STAR supply
  • Print on 58 mm or 80 mm paper widths

Receipt Printer for Retail and Hospitality

The Citizen CT-S310II-U-BK is a direct thermal desktop printer built for point-of-sale environments. It prints receipts and barcodes at up to 160 mm per second with a resolution of 203 dpi. The unit supports paper widths of 80.00 mm and 58.00 mm, making it suitable for standard and narrow receipt formats. It is designed for businesses needing reliable, high-speed transaction printing.

Compact Build with Dual Interface and Auto-Cutter

The black chassis houses an internal ENERGY STAR power supply, removing the need for an external brick and saving counter space. Connectivity includes a USB port and a 9-pin D-sub serial RS-232C connection for legacy or modern POS systems. A software-selectable cutter performs full or partial cuts, while the top-exit paper path keeps the printed receipt accessible. Operating range spans 5 to 45 degrees C.

160 mm/s Print Speed Drives Throughput

The single specification that decides fit is the maximum print speed of 160 mm/sec. This rate determines how quickly queues clear during peak trading hours. Buyers who need faster output for high-volume venues should note this ceiling. The printer also handles 1D and 2D barcodes including QR Code and PDF417, with non-volatile memory of 192K bytes for characters and 384K bytes for graphics.

How it compares

Measured against everything we stock in Thermal Receipt Printers, at today’s prices. Recalculated every night.

Price $137.99
Cheaper than about 69% of the 201 comparable items (median $254.99).

Specifications

Product
Brand nameCITIZEN
Model nameCT-S310II (CT-S310II-U-BK)
Product colorBlack
Printer categoryDesktop
Performance
Printing speed160 mm/sec
Max monochrome resolution8 dots / mm (203 dpi)
Memory
Memory size192K bytes for character, 384K bytes for graphic (Non-Volatile Memory)
Ports & slots
Interface typeSerial (RS-232C) (Connector: 9pin D-sub) + USB
Power
Power drawPrinting: 32 W
Sleep: 0.6 W, 0.18 W (USB power save mode)
Power supply100–240 V, 47-63 Hz, Engery Star approved
Size & build
Product dimensions5.51 in × 7.67 in × 5.19 in
Product weight3.96 lb (1.8 kg)
Shipping weight11.34 kg
Package size533 × 406 × 279 mm
Compatibility
Accepted media sizesPaper Width: 80 mm and 58 mm
Printing Width: 72 mm, 64 mm, 52.5 mm, 48 mm, 45 mm, 48.75 mm, 68.25 mm
In the box
Cable includedUSB Cable
Environment & compliance
Humidity range operating10% to 90% RH non condensing
Maximum operating temperature5 to 45 degrees C
Minimum operating temperature-4 to 140 degrees F
More details
Printing methodDirect Thermal
Supported barcodesUPC-A/E, JAN (EAN) 13/8 columns, ITF, CODE39, CODE128, CODABAR (NW-7), CODE93, PDF417, QR Code, GS1-DataBar
Cutter typePartial / Full cut available by software setting
Reliability MCBF200 Million pulses or 150 Km, 2 million cuts
Media formatThermal receipt paper

Questions about this item

What printing speeds does the USB and serial interfaces actually sustain?

The printer reaches 160 mm/sec over both the USB and RS-232C links; throughput is limited by the print engine rather than the interface.

What paper widths and roll sizes fit the CT-S310II?

It takes 80 mm and 58 mm wide thermal rolls; supported print widths are 72, 68.25, 64, 52.5, 48.75, 48 and 45 mm depending on the selected font and paper size.

How do you load paper and set the cutter so it does not jam?

Open the top cover, drop the roll in with paper feeding from the bottom, pull a short length through, close the cover firmly, then choose full or partial cut in the driver — skipping the cover-closure step causes most jams.

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