SEWOO SLK-TE21X Series User manual

Aroot Co., Ltd.
28-6, Gajangsaneopdong-ro, Osan-si, Gyeonggi- do, 18103, Republic of Korea
TEL : [phone] / FAX : [phone]
http://www.miniprinter.com
SLK-TE21X Series Rev. 07/2023 All specications are subject to change without notice
MODEL : SLK-TE21X Series
Receipt Printer User’s Manual

Table of Contents
This device co mplies with part 15 of the FCC Rules.
Operation is subject to the following two conditions.
1) This device may not cause harmful interference, and
2) This device must accept any interference received,
including interference that may cause undesired operation.
Vic Barczyk
19700 S Vermont Ave Ste 200 Torrance, CA 90502 | USA
[e-mail]
Victor Almazan
Paseo de la Reforma No. 265 Piso 2.Ocina SBC. Col.
Cuauhtémoc, C.P. 06500 Ciudad de Mexico | Mexico
[e-mail]
Disposal of Old Electrical&Electronic Equipment(Applicable in the European Union and other
European countries with separate collection systems)
This symbol on the product or on its packaging indicates that this product shall not be treated as household
waste. Instead it shall be handed over to the applicable collection point for the recycling of electrical and
electronics equipment. For more detailed information about recycling of this product, please contact your
local city oce, your household waste disposal service or the shop where you purchased the product.
1. Parts Identications 3
2. Setting up the printer 4
2-1. Unpacking 4
2-2. Connecting the cables 5
2-2-1. Interface Connector 6
2-2-2. Cash Drawer Connector 8
2-3. Loading the roll paper 9
2-4. Adjustment of paper width 12
3. Control panel and other functions 13
3-1. Control panel 13
3-2. Error Indicating 13
4. Self Test 14
5. ASCII Print 15
6. ECO Mode 15
6-1. Font 15
6-2. Paper Reduce 16
7. Printer Setting 17
7-1. Baudrate 17
7-2. Cutter 17
7-3. Error Beep 17
7-4. Melody 18
8. Hexadecimal Dump 19
9. Peripherals Connection 20
9-1. Bluetooth Connection 20
9-2. Wi-Fi Connection 20

10. Printer Cleaning 21
11. Linerless Printer 22
11-1. Linerless Printer Cleaning
22
11-2. Recommended Paper
22
12. Specications 23
13. Command List 25
14. Utilities 27
15. S/W 28
3
1. Parts Identications
Features LED indicators to
indicate printer status and
switches to operate the
printer.
CONTROL PANEL
Pull down this lever to open
the printer cover.
COVER OPEN LEVER
Used to turn on/o
power to the printer.
POWER SWITCH
Open this cover to load
or replace paper.
PRINTER COVER
3

5
4
2. Setting Up the Printer
2-1. Unpacking
Your printer box should include these items. If any items are damaged or missing,
please contact your dealer for assistance.
The Printer CD Roll Paper
Adaptor(Optional) Interface Cable(optional)
Cleaning pen(Optional)
2-2. Connecting the Cables
You can connect up the cables required for printing to the printer.
They all connect to the connector panel on the back of the printer, which is shown below :
For connection to
a host computer.
INTERFACE CONNECTOR
For connection to a host computer.
INTERFACE
CONNECTOR(USB)
Connects to peripheral units such as cash drawer, etc.
Do not connect this to a telephone.
PERIPHERAL DRIVE CONNECTOR
For connection of the AC adapter.
Never unplug the AC adapter while the printer is on.
POWER CONNECTOR
Before connecting any of the cables, make sure that both the printer and the
computer are turned o.

7
6
2-2-1. Interface Connector
D-SUB 25 Female Serial Centronics Parallel
USB “B” Type Ethernet
USB Interface
PIN SIGNAL I/O Description
1+5V -+5V
2DATA- -Printer transmit data line
3DATA+ -Printer transmit data line
4GND -System Ground
Serial Interface
PIN SIGNAL I/O DESCRIPTION
2TxD Output Printer transmit data line RS-232C level
3RxD Input Printer receive data line RS-232C level
4, 7 DTR Output Printer handshake to host line RS-232C level
6DSR Input Data Send Ready
1, 7 GND -System Ground
Centronics Parallel Interface
PIN SIGNAL I/O Description
1STROBE- Input Synchronize signal Data received
2~9 DATA 0~7 Input/Output Data bit Transmitted 0~7
10 ACK- Output Data receiving completed.
11 BUSY Output Impossible to print of data receiving.
12 PE Output Paper empty
13 SELECT Output Printer status for ON/OFF line
14 AUTO FEED- Input Paper auto feed signal
15 GROUND -System ground
16 GROUND -System ground
17 NC -
18 LOGIC-H -+3.3V
19~30 GROUND -System ground
31 INIT- Input Initialize
32 ERROR- Output Printer error
33 GROUND -System ground
34 NC -
35 NC -
36 SELLECT IN- Input Printer select signal
Ethernet Interface
PIN SIGNAL I/O
1Data Out + Output Data +
2Data Out - Output Data -
3GND Ground
4Data IN + Input Data +
5Data IN - Input Data -
6N.C
7N.C
8N.C

9
8
2-2-2. Cash Drawer Connector
The printer can operate two cash drawers with a 6 pin RJ-11 modular connector.
The driver is capable of supplying a maximum current of 0.1A for 510ms or less
when not printing.
61
PIN SIGNAL Description
1Signal GND -
2Drawer kick-out drive signal 1 Output
3Drawer open/close signal Input
4+24V -
5Drawer kick-out drive signal 2 Output
6Signal GND -
CAUTION
To avoid an overcurrent, the resistance of the drawer kick-out solenoid
must be 24 Ω or more.
2-3. Loading the Roll Paper
• NOTE:
Be sure to use paper rolls that meet the specications. Do not use paper rolls
that have the paper glued to the core because the printer cannot detect the
paper end correctly. (Turn o power switch)
1 Make sure that the printer is not receiving data; Otherwise, data may be lost.
2 Open the paper roll cover by pushing down the cover open button.
3 Remove the used paper roll core if there is one inside.
4 Insert new paper roll as shown.

11
10
1 Be sure to note the correct direction that the paper comes o the roll.
X O
2 Pull out a small amount of paper, as shown. Then, close the cover.
3 Tear o the paper as shown.
CAUTION:
When the paper is jammed from cutter, the top cover might be stuck as well. In this
case, repeat power on and o several times.
If the top cover is still stuck, please follow the steps to release the papers from jamming.
1 Make sure the printer is turned o.
2 Remove the screw from the DIP switch cover.
Then, take o the DIP switch cover as shown in the illustration below.
3 Turn screw with drivers to a direction until paper is released from the cutter

13
12
2-4. Adjustment of paper width
1 Please adjust the Paper Guide to t to the paper width as the direction of arrow.
2 Tight the screw after adjusting the Paper Guide.
3 Pull the edge of paper once the paper roll is installed correctly and close the Paper
Cover.
3. Control panel and other functions
3-1. Control panel
You can control the basic paper feeding operations of the printer with the button on
the control panel. The indicator lights help you to monitor the printer’s status.
Control Panel
Button
The button can be disabled by the ESC c 5 command.
Press the FEED button once to advance paper one line. You can also hold down the
FEED button to feed paper continuously.
3-2. Error indicators
This section explains the dierent patterns signaled by the three LED indicators
located on the top cover of the printer.
STATUS
PAPER ERROR POWER
REMARKS
RED RED GREEN
Power o OFF OFF OFF Normal power is not supplied to the printer
Power on OFF OFF ON Normal power is supplied to the printer
On line OFF OFF ON Normal error-free mode
Cover open OFF ON ON Close cover
Paper empty OFF ON ON Insert new paper roll
Paper near end ON OFF ON Paper is low

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14
4. Self Test
The self-test result indicated whether the printer is operating properly. Also with
this, user can check following options or status of the printer.
Control circuit
Printer mechanism
Printing quality
ROM version
Interface setting
This test is independent of any other equipment or software.
Running the self test
1 Make sure the printer is turned o and the printer cover is closed properly before
performing the self test.
2 Turn the printer on holding the FEED button, then the self-test will start. The
self-test prints the printer setting value and then prints the following, and pauses.
(Error LED On)
SELECT MODE BY BUTTON
1. ASCII PRINT
2. ECO MODE
3. PRINTER SETTING
4. HEXADUMP MODE
3 Press the FEED button consecutively (1~4)
1. ASCII PRINT
(Press the FEED button once) Printing test page constructed with ACII code.
2. ECO MODE
(Press the FEED button twice)
Set the ECO mode for saving paper and power.
(Default font type, Reduce paper margin, Density)
3. PRINTER SETTING
(Press the FEED button triple time)
Set the printer option.
(Serial baudrate, Cutting mode, Error beep, Melody)
4. HEXADUMP MODE
(Press the FEED button quad time)
Printing the HEX value received from the
interface
※ Wait for 5~6 seconds if you want to exit. Printer performs a cutting when exiting
this mode.
4 The printer is ready to receive data after nishing setting.
5. ASCII Print
6. ECO Mode
ASCII PRINT is printing a test page constructed ASCII code. You can able to check the
printer works properly with this
The ASCII PRINT test automatically ends and cuts the paper after printing the following:
*** Completed ***
The printer is ready to receive data as soon as it completes the ASCII PRINT.
After entering the ECO MODE, the list which can select the ECO option will be printed.
Similar like Self Test, you can press the FEED button to select a ECO option.
Once the input performs properly, the printer shows a result and store.
ECO MODE
01 FONT SETTING
02 LINE SPACE SETTING
03 LINE FEED SETTING
04 BARCODE[1D] HEIGHT
05 DENSITY SETTING
6-1. Font
FONT SETTING menu can be change the Font mapping(FONT A / FONT B).
If you did not want other side font, you can disable that.
- FONT A : 12x24
- FONT B : 9x17
FONT SETTING
01 FONT A → A / FONT B → B
02 FONT A → B / FONT B → B
03 3. FONT A → A / FONT B →A
04 4. FONT A → B / FONT B →A

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16
6-2. Paper Reduce
Reduce menu (Line space, Line feed, barcode[1D] height) was developed for paper
saving.
- FONT A: 12x24
- FONT B: 9x17
FONT SETTING
01 FONT A → A / FONT B → B
02 FONT A → B / FONT B → B
03 3. FONT A → A / FONT B →A
04 4. FONT A → B / FONT B →A
Change the printer settings. The options below can also be changed via the Memory Saver.
PRINTER SETTING
1. SELECT BAUDRATE
2. SELECT CUTTING MODE
3. SELECT ERROR BEEP OPTION
4. SELECT MELODY OPTION
7-1. Baudrate
After entering the BAUDRATE MODE, the list which can select the BPS will be printed.
Similar like Self Test, you can press the FEED button to select a BAUDRATE.
Once the input performs properly, the printer shows a result and store.
The printer is ready to receive data as soon as it completes the SELECT BAUDRATEMODE.
SELECT BAUDRATE
1. 4800bps
2. 9600bps
3. 19200bps
4. 38400bps
5. 57600bps
6. 115200bps
7-2. Cutter
Set cutter mode.
SELECT CUTTING MODE
1. PARTIAL CUT
2. FULL CUT
7-3. Error Beep
If the cover is open or there is no paper, the error beep function is activated.
This option allows you to enable / disable the error beep.
SELECT ERROR BEEP OPTION
1. BEEP ON
2. BEEP OFF
7. Printer Setting

19
18
7-4. Melody
To DK Port (Cash), Melody box or external buzzer can be connected.
You can activate it from the Melody Setting menu, and the melody will operate after the cutting
operation.
- Melody Box : Melody is fixed and volume can be adjusted.
- External Buzzer : 3 types of melody are output according to the Melody Type setting and
volume control is not included
SELECT MELODY OPTION
1. MELODY SETTING
2. SELECT MELODY TYPE
MELODY SETTING
1. MELODY ON AFTER CUTTING
2. MELODY OFF
SELECT MELODY TYPE
1. MELODY󾖻Ⅰ
2. MELODY-Ⅱ
3. MELODY-Ⅲ
This feature allows experienced users to see exactly what data is coming to the printer. This can be
useful in finding software problems.
When you go into the hex dump function, the printer prints all commands and other data in
hexadecimal format along with a guide section to help you find specific commands.
To use the hex dump feature, follow these steps
1. Please turn printer off.
2. Please turn printer on while press down “Feed” button.
3. Press the FEED button three times when the Self Test printed.
4. Now printer had entered into Hexa dump mode.
5. Run any software program that sends data to the printer.The printer prints ”Hexadecimal printing
mode…” and then all the codes it receives in a two-column format. The first column contains the
hecadecimal codes and the second column gives the ASCII characters that correspond to the codes.
Hecadecimal Dump
1B 21 00 1B 26 02 40 40 .!..& . @ @
1B 25 01 1B 63 34 00 1B .%..c4 ..
41 42 43 44 45 46 47 48 ABCDEFGH
□A period (.) is printed for each code that has no ASCII equivalent.
6. Turn off the printer.
7. Turn on the printer.
8. Hexadecimal Dump

21
20
This product can communicate with other devices via Bluetooth or Wi-Fi communication and cable.
9-1. Bluetooth Connection
1. The Printer can be connected to devices equipped with Bluetooth communication capacity
(PDAs, PCs, etc.)
2. Use the Bluetooth connection function supported by the device to connect to the printer.
9-2. Wi-Fi Connection
1. The Printer can be connected to devices equipped with Wi-Fi communication capacity
(PDAs, PCs, etc.)
2. Use the Wi-Fi connection function supported by the device to connect to the printer.
♣NOTE
Please refer to the configuration manual for details.
Optional
Optional
9. Peripherals Connection
If the interior of the printer is dusty, printing quality can be lowered.
In this case, follow the instructions below to clean the printer.
NOTE
1 Make sure to turn the printer power o prior to cleaning
2 Regarding print head cleaning, as the print head is very hot during printing, turn
o the printer power and wait approximately 10 minute before start.
3 When cleaning the print head, take care not to touch the heated part of the print
head. The print head subject to be damaged by static electricity.
4 Take care not to allow the print head to become scratched and /or damaged in
any way.
1 Use an applicator swab moistened with an alcohol solution to clean the print head
and remove any dusts.
2 Once the cleaning is completed, insert paper roll into the printer few minutes later
and close the printer cover.
Preventing Overheating
To prevent the motor from overheating, continuous operation of the printer should be
1.5 m or less in print length. Set the pause time for 30 seconds or more than it.
10. Printer Cleaning

23
22
11. Linerless Printer
11-1. Linerless Printer Cleaning
Paper dust or impurities inside the printer may cause printing problems. Please
clean as below.
1 Open the printer cover and clean the paper PASS part.
2 Remove the paper if it is jammed.
3 Remove impurities from cutter blade with cleaning pen or alcohol.
4 Wipe the printer head and roller with cleaning pen.
5 Wipe the paper detection sensor with a cotton swab or cloth.
6 When using linerless paper, please perform cleaning before using 30 Rolls or
within a week.
NOTE
If the adhesive builds up due to poor cleaning, printing problems may occur.
11-2. Recommended Paper
MAX International Converters, Inc. MAXStick Products Ltd(USA)
WARNING
We are not responsible for any paper use issues other than recommended
paper, which may result in poor print quality or damage to the product.
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 Windows Driver(XP ~, Server2003
~),Windows CE & Mobile Driver(CE 4.2 ~,
Mobile 5.0 ~),Linux Driver, Mac Driver,
OPOS Driver, JavaPOS Driver, iOS SDK,
Android(6.0 ~) SDK, Windows SDK, Win-
dows CE SDK Linux SDK
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12. Specications

25
24
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 
 
  
 
  
 
No. Command Function REMARKS
1 HT Horizontal tab
2 LF Print and line feed
3 CR Print and carriage return
4 FF Print and return to standard mode(in page mode)
5 CAN Cancel print data in page mode
6 DLE EOT Real-time status transmission
7 DLE ENQ Real-time request to printer
8 DLE DC4 Generate pulse at real-time
9 ESC FF Print data in page mode
10 ESC SP Set right-side character spacing
11 ESC ! Select print mode(s)
12 ESC $ Set absolute print position
13 ESC % Select/cancel user-defined character set
14 ESC & Define user-defined characters
15 ESC * Set bit-image mode
16 ESC - Turn underline mode on/off
17 ESC 2 Select default line spacing
18 ESC 3 Set line spacing
19 ESC = Select peripheral device
20 ESC ? Cancel user-defined characters
21 ESC @ Initialize printer
22 ESC D Set horizontal tab positions
23 ESC E Turn emphasized mode on/off
24 ESC G Turn double-strike mode on/off
25 ESC J Print and feed paper using minimum units
26 ESC L Select page mode
27 ESC M Select character font
28 ESC R Select an international character set
29 ESC S Select standard mode
30 ESC T Select print direction in page mode
31 ESC V Turn 90° clockwise rotation mode on/off
32 ESC W Set printing area in page mode
33 ESC ＼ Set relative print position
34 ESC a Select justification
35 ESC c 3 Select paper sensor(s) to output paper-end signals
36 ESC c 4 Select paper sensor(s) to stop printing
37 ESC c 5 Enable/disable panel buttons
38 ESC d Print and feed paper n lines
39 ESC p General pulse
13. Command List

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No. Command Function REMARKS
40 ESC t Select character code table
41 ESC { Turn upside-down printing mode on/off
42 FS p Print NV bit image
43 FS q Define NV bit image
44 GS ! Select character size
45 GS $ Set absolute vertical print position in page mode
46 GS * Define downloaded bit image
47 GS / Print downloaded bit image
48 GS B Turn white/black reverse printing mode on/off
49 GS H Select printing position of HRI characters
50 GS I Transmit printer ID
51 GS L Set left margin
52 GS P Set horizontal and vertical motion units
53 GS V Select cut mode and cut paper
54 GS W Set printing area width
55 GS ＼Set relative vertical print position in page mode
56 GS a Enable/disable Automatic Status Back(ASB)
57 GS f Select font for HRI characters
58 GS h Set bar code height
59 GS k Print bar code
60 GS r Transmit status
61 GS v 0 Print raster bit image
62 GS w Set bar code width
< Add >
1 ESC i Full cut
2 ESC m Partial cut
3 FS ! Set print mode(s) for Kanji characters
4 FS & Select Kanji character mode
5 FS - Turn underline mode on/off for Kanji character
6 FS . Cancel Kanji character mode
7 FS 2 c1 d1…dk Define user-defined Kanji characters
8 FS C Select Kanji character code system
9 FS S 1 2 Set Kanji character spacing
10 FS W Turn quadruple-size mode on/off for Kanji character
11 RS Beep Sound
The following utilities and concerned manual can be found on the CD or homepage.
No. Name Description
1Memory Saver
This is a utility that allows you to set printers by
interface.
Detailed settings such as Wi-Fi, Ethernet, and COM ports
can be congured.
2 NV Logo Upload
With NV Logo Upload running on Windows OS, you can
upload and remove the bmp le as Logo in the printer’s
ash memory, and print test is possible.
3 Download Tool
(F/W)
Printer F/W and Font Download are available, and BT,
Wi-Fi module F/W Download is supported as an option.
4 Android Utility
(Sewoo M_Utility)
It is a utility app that prints text, barcodes, images, etc.
through Bluetooth and Wi-Fi communication, and able
to printer settings.
14. Utilities

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15. S/W
We provides SDK, Driver, etc. as follows to respond to various S/W usage environments.
You can download this S/W from the homepage.
No. Name Description
1Windows Driver
This is an install program used to print a POS printer in
Windows OS.
2 Linux Driver
This is the Cups Driver used to print a Thermal printer in
the Linux environment.
3 OPOS Driver
This is a driver that controls POS printers using the
OPOS standard.
It can be used after initial setting(POS Printer&Cash
Drawer) using the setting tool.
4 JavaPOS Driver The JavaPOS driver is an interface standard for POS
software written in Java.
5Mac Driver This is the Cups Driver used to print a Thermal printer in
the Mac OS environment.
6
Android Plugin
(Sewoo Print
Service Plugin)
This is a print service plug-in that allows you to print
documents, images, and web pages without installing
additional apps.
7Windows SDK
This is library for communication and data output with
Thermal printer in Windows OS.
Can be used through direct communication and driver.
8Android SDK This is library for communication and data output with
Thermal printers in Android OS.
No. Name Description
9iOS SDK This is library for communication and data output with
Thermal printers in iOS.
10 Linux SDK This is library for communication and data output with
Thermal printers in Linux.