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Citizen CL-S621II/CL-S631II
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Citizen CL-S621II/CL-S631II

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Versatile 4-inch desktop label printing

The Citizen CL-S621II and CL-S631II print labels and tags in direct thermal or thermal transfer mode. Citizen's Hi-Lift metal mechanism opens wide for loading, while ARCP automatically controls ribbon tension to reduce wrinkles.

Choose the CL-S621II for 203 dpi printing at up to 6 ips, or the CL-S631II for 300 dpi detail at up to 4 ips. Both include Serial and USB connections and an internal power supply.

Citizen CL-S621II and CL-S631II label printers

Key Specifications

  • Print method: Direct thermal and thermal transfer
  • Maximum print width: 4 inches (104 mm)
  • Resolution: CL-S621II: 203 dpi; CL-S631II: 300 dpi
  • Print speed: CL-S621II: up to 6 ips (150 mm/s); CL-S631II: up to 4 ips (100 mm/s)
  • Media and ribbon handling: Media width 0.5–4.6 inches (12.5–118 mm); internal rolls up to 5 inches, external rolls up to 8 inches; 1-inch core. Ribbons up to 360 m with a 74 mm maximum outside diameter and 1-inch core; ink side in or out.
  • Connectivity: Serial RS-232C and USB 2.0 standard; Ethernet, IEEE 1284 parallel, or wireless LAN available by configuration.
  • Duty / application fit: Desktop labels and tags for healthcare, manufacturing, and retail; CL-S621II also supports courier and logistics applications.
  • Dimensions and weight: 231 × 289 × 270 mm (W × D × H); 4.5 kg
  • Warranty: 2 years on printer

In the Box

  • Selected Citizen CL-S621II or CL-S631II printer
  • AC power cord
  • Media holder bar and guide
  • Head cleaner
  • Test label media
  • Ribbon holder and paper core
  • Sample ribbon
  • Quick Start Guide

Additional labels, ribbon, interface cables and optional accessories are sold separately unless included with the selected configuration.

ARCP Ribbon Tension Control

Citizen’s ARCP system adjusts ribbon tension to help prevent wrinkling and keep thermal-transfer printing clear. The wide-opening Hi-Lift mechanism provides direct access for label and ribbon changes.

Flexible Ribbon Choice

Both models accept ribbons up to 360 m long, with selectable inside- or outside-wound operation. Wax, wax-resin and resin ribbon support gives you a choice of consumables for different label applications.

Printing Technology
Thermal Transfer + Direct Thermal
Resolution
CL-S621II: 203 dpi; CL-S631II: 300 dpi
Print Speed (maximum)
CL-S621II: 6 inches per second (150 mm/s); CL-S631II: 4 inches per second (100 mm/s)
Print Width (maximum)
4 inches (104 mm)
Media Width (min to max)
0.5 - 4.6 inches (12.5 - 118 mm)
Media Thickness (min to max)
63.5 to 254 µm
Media Length (min to max)
CL-S621II: 0.25 to 99.99 inches (6.35 to 2539.74 mm); CL-S631II: 0.25 to 64 inches (6.35 to 1625.6 mm)
Roll Size (max), Core Size
Inside diameter 5 inches (125 mm) External diameter 8 inches (200mm) Core size 1 inch (25mm)
Ribbon size
2.9 inches (74mm) maximum outside diameter. 360 metres length. 1 inch (25mm) core
Ribbon winding & type
Ink side in or out, switch selectable. Wax, Wax/Resin or Resin Type
Ribbon system
ARCP™ automatic ribbon tension adjustment
Mechanism
Hi-Lift™ metal mechanism with wide opening head
Media Sensor
Fully adjustable gap, notch and reflective black mark
Main Interface
Dual Interface Serial (RS-232C), USB (version 2.0, full speed)
Optional interfaces
  • Wireless LAN 802.11b and 802.11g standards, 100 metres, 64/128 bit WEP, WPA, up to 54Mbps
  • Ethernet (10/100 BaseT)
  • Parallel (IEEE 1284 compliant)
    • Case
    Hi-Open™ industrial ABS case with safe close
    Control panel
    4 buttons and 4 LEDs
    Flash (Non-Volatile Memory)
    16 MB total, 4MB available for user
    RAM (standard Memory)
    32MB total, 8MB available for user
    Drivers and software
    Free-of-charge from the Citizen website, including support for various platforms
    Emulations (Languages)
  • Datamax® DMX
  • Cross-Emulation™ - autoswitch between Zebra® and Datamax® emulations
  • Zebra® ZPL2®
  • CBI™ BASIC Interpreter
  • Eltron® EPL2®
    • Size (W x D x H) and Weight
    231 x 289 x 270 mm, 4.5 Kg
    Warranty
    2 years on printer. 6 months or 50 Kms printhead
    Cutter
    Guillotine type, Dealer Installable
    CL-S621II / CL-S631II Windows Printer Driver 11.11.0 (Windows 10/11; Server 2008/2012/2016/2019)
    Download
    CL-S621II Spec Sheet
    Download
    CL-S621II/CL-S631II User Manual
    Download
    CL-S631II Spec Sheet
    Download

    Shop CL-S621II/CL-S631II Models

    CL-S621IINNUBK

    CL-S621II Thermal Transfer, 203 DPI, Serial & USB, Gray

    DPI:

    203

    Extra Feature:

    None

    Interface:

    Serial & USB

    $604.49

    CL-S631II-EPUBK

    CL-S631II Thermal Transfer, 300 DPI, LAN, Serial & USB, Gray

    DPI:

    300

    Interface:

    LAN, Serial & USB

    Extra Feature:

    None

    $964.21

    CL-S631II-EPUBK-P

    CL-S631II Thermal Transfer, 300 DPI, LAN, Serial & USB, Peeler, Gray

    DPI:

    300

    Interface:

    LAN, Serial & USB

    Extra Feature:

    Peeler

    $1108.32

    CL-S631IINNUBK

    CL-S631II Thermal Transfer, 300 DPI, Serial & USB, Gray

    DPI:

    300

    Extra Feature:

    None

    Interface:

    Serial & USB

    $748.60

    CL-S631IINNUBK-C

    CL-S631II Thermal Transfer, 300 DPI, Serial & USB, Cutter, Gray

    DPI:

    300

    Extra Feature:

    Cutter

    Interface:

    Serial & USB

    $892.69

    CL-S631IINNUBK-P

    CL-S631II Thermal Transfer, 300 DPI, Serial & USB, Peeler, Gray

    DPI:

    300

    Extra Feature:

    Peeler

    Interface:

    Serial & USB

    $844.31

    CL-S631II-PFUBK

    CL-S631II Thermal Transfer, 300 DPI, Parallel, Serial & USB, Gray

    DPI:

    300

    Extra Feature:

    None

    Interface:

    Parallel, Serial & USB

    $767.29

    CL-S631II-PFUBK-C

    CL-S631II Thermal Transfer, 300 DPI, Parallel, Serial & USB, Cutter, Gray

    DPI:

    300

    Extra Feature:

    Cutter

    Interface:

    Parallel, Serial & USB

    $911.39

    CL-S621II-EPWSUBK

    CL-S621II Thermal Transfer, 203 DPI, Premium Ethernet, Wi-Fi Short Range, Serial & USB, Gray

    DPI:

    203

    Extra Feature:

    None

    Interface:

    Premium LAN, WiFi Short Range, Serial & USB

    $940.01

    CL-S621II-ETUBK

    CL-S621II Thermal Transfer, 203 DPI, Economy Ethernet, Serial & USB, Gray

    DPI:

    203

    Interface:

    Economy Ethernet, Serial & USB

    Extra Feature:

    None

    $734.30

    CL-S621II-EPWLUBK

    CL-S621II Thermal Transfer, 203 DPI, Premium LAN, WIFI Long Range, Serial & USB, Gray

    DPI:

    203

    Extra Feature:

    None

    Interface:

    Premium LAN, WIFI Long Range, Serial & USB

    $945.50

    CL-S621II-EPUBK-C

    CL-S621II Thermal Transfer, 203 DPI, LAN, Serial & USB, Cutter, Gray

    DPI:

    203

    Extra Feature:

    Cutter

    Interface:

    LAN, Serial & USB

    $964.21

    CL-S621II-EPUBK

    CL-S621II Thermal Transfer, 203 DPI, Premium LAN, Serial & USB, Gray

    DPI:

    203

    Extra Feature:

    None

    Interface:

    Premium LAN, Serial & USB

    $820.11

    CL-S621IINNUBK-C

    CL-S621II Thermal Transfer, 203 DPI, Serial & USB, Cutter, Gray

    DPI:

    203

    Extra Feature:

    Cutter

    Interface:

    Serial & USB

    $748.60

    CL-S621IINNUBK-P

    CL-S621II Thermal Transfer, 203 DPI, Serial & USB, Peeler, Gray

    DPI:

    203

    Extra Feature:

    Peeler

    Interface:

    Serial & USB

    $700.19

    CL-S621II-PFUBK

    CL-S621II Thermal Transfer, 203 DPI, Parallel, Serial & USB, Gray

    DPI:

    203

    Extra Feature:

    None

    Interface:

    Parallel, Serial & USB

    $624.30
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