LK-T210 Thermal Receipt Printer Technical Manual

Manufactured by SEWOO TECH CO., LTD. Visit: www.miniprinter.com

Table of Contents

• 1. General Specifications
• 2. Configuration
• 3. Connectors
• 4. Control Command Summary

1. General Specifications

1.1 Printing Specifications

• Printing method: Thermal line printing
• Dot density: 180dpi x 180dpi
• Printing direction: Unidirectional with friction feed
• Printing width: 72mm (2.84"), 512 dot positions (180dpi)
• Characters per line (default): Font A: 42, Font B: 56
• Printing speed: High speed mode: 47 lines/second maximum (1/6 inch feed) (at 24V, 20°C); Approximately 200mm/sec maximum (approximately 7.8 inches/sec maximum)
• Note: Speeds are switched depending on the applied voltage to the printer and head temperature conditions automatically.
• Note: Variations in printing may occur after switching printing speed modes. For logo printing with ESC* command, using a downloaded bit image is recommended. Printing speed does not change during downloaded bit image printing.
• Line spacing (default): 1/6 inch (4.23mm), programmable by control command.

1.2 Character Specifications

• Number of characters: Alphanumeric characters: 95; Extended graphics: 128 x 7 pages (including one space page); International characters: 32 (English, Hangul, Chinese (GB2312, Big5), Kanji)
• Character structure: Font A: 12 x 24, Font B: 9 x 17, Hangul, Chinese: 24 x 24. Font A is selected as the default.
• Character size:

1.3 Auto Cutter

Partial cut: Cutting with one point center uncut.

Note: To prevent dot displacement, after cutting, paper must be fed approximately 1mm (14/360 inches) or more before printing.

1.4 Paper Roll Supply Device

• Supply method: Drop-in paper roll
• Near-end sensor: Detection method: Photo Reflector. Paper roll spool diameter: Inside: 12mm (.47"), Outside: 18mm (.71"). Near-end adjustment: Adjusting screw. Remaining amount: Fixed position #1 (approx. 23mm / 0.9"), #2 (approx. 27mm / 1.06").
• Note: A command can be used to stop printing upon detection of a paper near-end.

1.5 Paper Specification

• Paper type: Specified thermal paper
• Form: Paper roll
• Paper width: 82 ±0.5mm (3.23" ±0.02"); 79.5 ±0.5mm (3.13" ±0.02"); 59.5 ±0.5mm (2.34" ±0.02"); 57.5 ±0.5mm (2.26" ±0.02") for different models.
• Paper roll size: Roll diameter: Maximum 83mm. Take-up paper roll width: 80 ± 0.5, 1.0mm (3.15"±0.020", 0.04").
• Paper roll spool diameter: Inside: 12mm (.47"), Outside: 18mm (.71").
• Note: Paper must not be pasted to the paper roll spool.

1.6 Printable Area

Describes the printable area for different paper widths under EPSON Emulation.

• 82.5mm (3.25") paper width model: Printable area is 72.2mm (512 dots). Margins: 3mm top/bottom, 6.8mm on one side.
• 80 mm (3.15") paper width model: Printable area is 72.2mm (512 dots). Margins: 3mm top/bottom, 4.3mm on one side.
• 60mm (2.36") paper width model: Printable area is 54.1mm (384 dots). Margins: 3mm top/bottom, 2.4mm on one side.
• 58mm (2.28") paper width model: Printable area is 50.8mm (360 dots). Margins: 3mm top/bottom, 3.7mm on one side.

1.7 Printing and Cutting Positions

Diagrams illustrate printing and cutting positions. Key reference points include the manual cutter position (approx. 30.5mm from edge), auto-cutter blade position (approx. 12.6mm from edge), and the center of the print dotline, all relative to the paper feed direction. Note: Numeric values are typical center values for design and may vary slightly due to paper slack or variations.

1.8 Internal Buffer

• Receive buffer: 4kbyte

1.9 Electrical Characteristics

• Supply voltage: +24 VDC ± 7%
• Current consumption (at 24V): Operating: Approx. 1.5A (at ASCII Printing); Peak: Approx. 10A (at print duty 100%, for 10 seconds or less); Stand-by: Approx. 0.15A
• Power Connector: PIN1: 24V DC, PIN2: No Connection, PIN3: GROUND

1.10 EMI and Safety Standards Applied

• Europe: EMI – EN55022 CLASS A; EMS – EN61000-3-2, EN61000-3-3, EN50082-1; Safety Standard: EN60950-1
• North America: EMI - FCC Part#15 Class A; Safety Standards - UL(1950), c-UL(No.950)

1.11 Reliability

• MCBF: 50 million lines (based on average printing rate of 12.5% with paper thickness 65-75 µm); 35 million lines (based on average printing rate of 12.5% with paper thickness 76-150 µm).
• Cutter Life: Performs 1,500,000 cuts with 65 µm thickness, and/or 300,000 cuts with 100 µm thickness.

1.12 Environmental Conditions

• Temperature: Operating: 5° to 45°C; Storage: -20° to 60°C (except for paper)
• Humidity: Operating: 10 to 90%RH; Storage: 10 to 90%RH (except for paper)

2. Configuration

2.1 Interface

2.1.1 RS-232 serial interface

2.1.2 Specifications

• Data transmission: Serial
• Synchronization: Asynchronous
• Handshaking: DTR/DSR or XON/XOFF control
• Signal levels: MARK = -3 to -15V (Logic "1"), SPACE = +3 to +15V (Logic "0")
• Baud rate: 9600, 19200, 38400, 115200 bps
• Data length: 8 bits
• Parity Settings: None
• Stop bits: 1
• Connector (printer side): Female DSUB-25 pin connector
• Note: Data word length, baud rate, and parity depend on DIP switch settings.

2.1.3 Switching between on-line and off-line

The printer does not have an on-line/off-line switch. The printer goes off-line in the following situations:

• Between power-on (including interface reset) and readiness to receive data.
• During self-test.
• When the cover is open.
• During paper feeding using the paper feed button.
• When printing stops due to paper-end (detected by paper roll end or near-end detector with ESC c4 feature).
• During macro execution standby status.
• When a temporary abnormality occurs in the power supply voltage.
• When an error has occurred.

2.1.4 Interface connector terminal assignments and signal functions

2.1.5 Serial interface connection example

Describes host-to-printer connections for TXD, DSR, RXD, DTR, FG, SG. Details: Set handshaking for data reception. Transmit data after power-on and initialization.

Serial transmission bit frame: Depicts a single data transmission frame with a START bit, followed by 7 or 8 data bits (B0-B7), an optional PARITY bit, and 1 or 2 STOP bits.

Line transmission with protocol: Shows the RxD (Receive Data) line toggling to represent data bits, and the DTR (Data Terminal Ready) line switching between 'ready' and 'busy' states, indicating buffer status (full/emptied).

2.1.6 Centronics parallel interface

1) Specifications

• Data transmission: 8-bit parallel
• Synchronization: STROBE pulse supplied by host computer.
• Handshaking: ACK and BUSY
• Connector: D-SUB 36 (female) or equivalent

The Centronics parallel interface timing diagram illustrates the interaction between the host and printer. Key signals include DATA (carrying data bits), nStrobe (synchronization pulse), BUSY (indicating the printer is occupied), and nAck (acknowledging data reception). The diagram shows the sequence of these signals, including setup times (tSetup), hold times (tHold), strobe pulse width (tSTB), and busy/acknowledge timing (tReady, tBUSY, tReply, tACK, tnBUSY, tNext).

PIN assignments and DESCRIPTION

2.1.7 Data Receiving Timing (Compatibility Mode)

Note: The printer latches data at a nStrobe timing.

2.1.8 USB Interface

1) Specifications

• Data transmission: USB 2.0
• Connector: USB "A" type connector

2) USB interface connection example

The USB interface connection example shows standard host-to-printer pin assignments: VCC to VCC, DATA+ to DATA+, DATA- to DATA-, and GND to GND.

PIN assignments and DESCRIPTION

2.1.9 Interface Connector

Diagrams illustrate the pinouts for:

• D-SUB 25 Female Serial: Shows the pin numbering layout for a 25-pin serial connector.
• Centronics Parallel: Shows the pin numbering layout for a 36-pin parallel connector.
• Ethernet: Shows indicators for Status LED and Link END.
• Wi-fi: Shows a Reset S/W (Software) button.

3. Connectors

3.1 Interface Connectors

Refer to Section 2.1, Interface.

3.2 Electrical Characteristics

• Input Voltage: DC 24V ± 10%
• Current Consumption: Operating: Approx. 1.5A (at ASC || printing); Peak: Approx. 10A (at print duty 100%, for 10 seconds or less); Stand-by: Approx. 0.15A
• Power Connector: PIN1: 24V DC, PIN2: No Connection, PIN3: GROUND

3.3 Drawer Kick-out Connector (Modular Connector)

The pulse specified by ESC p or DLE DC4 is output to this connector. The host can confirm input signal status using DLE EOT, GS a, or GS r commands.

1) Pin assignments:

Connector model: Printer side: DAEEUN DEK-623PCB-6-B or Equivalent; User side: 6-position 6-contact (RJ12 telephone jack).

Drawer Kick-out Connector Pin Assignments

Note: +24V is output through pin 4 when the power is turned on. Pin 4 must be used only for the drawer.

Drawer kick-out drive signal

• Output signal: Output voltage: Approximately 24V
• Output current: 1A or less

Caution: To avoid overcurrent, the resistance of the drawer kick-out solenoid must be 24 Ω or more.

Output waveform: Outputs waveforms to points A and B. t1 (ON time) and t2 (OFF time) are specified by ESC p or DLE DC4.

Drawer open/close signal: Input signal level (connector pin 3): "L" = 0 to 0.8V, "H" = 3 to 5V.

Drawer Circuitry: A circuit diagram shows solenoids, switches, and connections. Important notes: use shielded cable, avoid simultaneous energizing of two driver transistors, maintain drawer drive duty (ON time / (ON time + OFF time) ≤ 0.2), use printer power supply for the drawer, ensure solenoid resistance is ≥ 24 Ω to prevent overcurrent, and do not connect telecommunication networks.

4. Control Command Summary