Fenix Imvico TK51 Series User manual

TK51 THERMAL PRINTER SERIES
IF9000 interface
Operation Manual – Version 3
November - 2010

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Revision list for the TK51 thermal printer series operation manual.
Version 3 Date: November 2010
Page Revision type Before change After change
7,63 Add Firmware update through the
communication port.
Firmware version transmission
command.
16 Add 2.2.1.a) Earth-GND connection
42 Add New ticket completed flag
DEL EOT n=1 (bit 6).
45 Revised ESC J n command
...nx 0,125 mm ESC J n command ... n.x 0,0625 mm
63 Add Serial number transmission
command.
64 Add Character rotation command.
65 Add Inverse printing mode
command
66 Add Automatic status report
command.

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I N D E X
IMPORTANT NOTES ON TK51/IF9000 HANDLING ........................................... 5
0- INTRODUCTION.............................................................................................. 7
1- GENERAL SPECIFICATIONS......................................................................... 8
1.1-PRINTING SPECIFICATIONS............................................................. 8
1.2- CHARACTER SPECIFICATIONS....................................................... 8
1.3- ELECTRICAL CHARACTERISTICS................................................... 9
1.4- PAPER REQUIREMENTS.................................................................. 9
1.5- ENVIRONMENTAL CONDITIONS..................................................... 10
1.6- INTERNAL BUFFER........................................................................... 10
2 – INSTALLATION.............................................................................................. 11
2.1- TK51 INSTALLATION CONSIDERATIONS....................................…. 11
2.1.1- TK51 tension roller ................................................................12
2.2- TK51/IF9000 USER INTERFACE ELEMENTS....................................13
2.2.1- Power supply connector.........................................................14
2.2.2- Serial RS-232 connector........................................................ 16
2.2.2.1- Specifications ......................................................... 16
2.2.2.2- Serial interface connection example....................... 17
2.2.3- CENTRONICS parallel connector.......................................... 18
2.2.3.1- Compatibility mode ................................................ 18
2.2.3.2- Parallel interface pins assignment for each mode....20
2.2.4- USB connector....................................................................... 21
2.2.4.1- Assignments of USB connector terminals............... 21
2.2.5- Thermal printer connector..…………….................................. 22
2.2.6- Leds and buttons connector...................................................22
2.2.7- Paper-near-end and ticket pick-up sensor connectors......... 23
3 – BASIC OPERATIONS.................................................................................... 25
3.1- LOADING PAPER.............................................................................. 25
3.1.1- Automatic paper load............................................................ 25
3.1.2- Manual paper load................................................................. 26
3.2- BUTTONS FUNCTIONS.................................................................... 26
3.3- LEDS INDICATORS............................................................................ 27
3.4- SPECIAL MODES.............................................................................. 27
3.4.1- Self-test mode....................................................................... 27
3.4.2- Programming mode............................................................... 29
3.4.3- Hexadecimal dump mode...................................................... 30
3.5- ERROR PROCESSING.......................................................................31
3.5.1- No paper / head-up error........................................................33
3.5.2- Paper-near-end error............................................................. 33
3.5.3- Thermal head temperature error............................................ 33
3.5.4- Autocutter error...................................................................... 33
3.5.5- Thermal head voltage (vp) error............................................ 34
3.5.6- Hardware error...................................................................... 34
3.5.7- Ticket pick-up error............................................................... 34
3.5.8- Black mark error.....................................................................34
3.5.9- Serial port error detection flow chart.......................................35
3.5.10- Parallel port error detection flow chart..................................36
3.6- OPTICAL MARK............................................................................................ 37
3.6.1- EXAMPLE ON USING THE OPTICAL MARK...................... 38

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4 – CONTROL COMMANDS............................................................................... 40
4.1- COMMAND NOTATION..................................................................... 40
4.2- TERMS EXPLANATION..................................................................... 40
4.3- CONTROL COMMANDS DESCRIPTION.......................................... 41
APPENDIX A – CHARACTER CODE TABLES.....................................................68
APPENDIX B – WINDOWS CHARACTER FONT LOADER SOFTWARE.......... 69
APPENDIX C – RECOVERY FROM AUTOCUTTER ERROR............................. 70
APPENDIX D – EXTERNAL APPEARANCE........................................................ 72
APPENDIX E – SPECIFICATIONS...................................................................... 74
APPENDIX F – HOW TO ORDER - ACCESORIES............................................. 75
APPENDIX G – CODE128 BAR CODE................................................................ 76
APPENDIX H – TESTING SOFTWARE................................................................ 80

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IMPORTANT NOTES ON TK51/IF9000 HANDLING
In order to preserve the life of the printer, it is necessary to keep in mind some
precautions in the handling of the TK51/IF9000. Please read carefully the
following points in order to make a good use of the printer.
SAFETY PRECAUTIONS
•Before using the printer, read carefully section 2-INSTALLATION.
•NEVER connect the external power supply with the wrong polarity. This could
permanently damage the printer.
•Turn off the printer immediately if it produces smoke, a strange smell or an unusual
noise. Keeping on using the printer could cause fire. Unplug the equipment immediately
and contact your official distributor.
•NEVER connect cables with different connectors from the ones mentioned in this
manual. Failing on doing so could permanently damage the printer.
•Use a power supply whose output voltage is within the specification range stated in this
manual. Over voltage can permanently damage the printer. Under voltage can cause
malfunctions.
•NEVER wet TK51/IF9000 with water or any other liquid. If any liquid is spilled inside the
equipment, unplug the power cable immediately and contact the technical service.
•Make sure the printer is on a steady, securely fixed surface. If the printer falls down, it
could break or damage.
•NEVER use the printer in high humidity or in locations with high risk of fire.
•NEVER place heavy objects on top of the printer and never lean on it.
•NEVER put any object inside of the printer, as it could cause hardware damage on it,
such as short-circuit, print head breaking or general failure of the printer.
•NEVER shake the TK51/IF9000.
•NEVER disassemble or modify the hardware of the TK51/IF9000.
•NEVER try to repair the TK51/IF9000. Please contact your official distributor in case of
failure.
•As the printer contains electromagnets (inside of the motor), it should not be used in
excessively dirty environments or places with dust or metal particles.
•NEVER print without paper loaded or without the cover closed, as the thermal print head
life can be highly shortened.
•Avoid touching accessible parts with metallic objects, such as screwdrivers or tweezers,
the print head thermal elements as well as the electronic printed circuit. They are
delicate parts.
•NEVER touch with your hands the areas around the print head and the motor surface as
they become very hot during and just after printing; wait 15 seconds after printing to let
them cool down.
•NEVER touch the surfaces of the print head thermal elements or the electronic printed
circuit, as dust and dirt can stick to their surface and cause damage by electrostatic
discharge. Moreover, some electronic components can get very hot during operation.
•The thermal paper contains Na+, K+ and Cl- ions that can cause harm to the print head
elements. Therefore, use only the specified paper.
•If the printer has not been used for long period of time and the paper was loaded, the
paper could become deformed by the drive roller pressure. It is recommended to make it
advance at least 30 mm before printing again.
•For safety reasons, unplug the printer if it is not going to be used over a long period of
time.
•Do not print continuously (without stopping) for more than 6 minutes.

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•CLEANING PROCEDURE AND PRECAUTIONS.
In order to clean the thermal print head, proceed as indicated by the following steps:
1) Open up the paper cutter.
2) Go down the head lever until clicking. The thermal head is held in the up
position .
3) Soak a cotton sponge in alcohol (ethanol, methanol or IPA), and rub it gently
along the thermal head in order to remove the possible accumulation of
paper particles.
4) Wait for alcohol to evaporate before inserting the paper roll and closing the
head.
Figure a. Head cleaning procedure
FENIX recommends cleaning the thermal print head periodically (every 2 or 3
months) in order to keep an optimal print quality.
NOTES
!NEVER touch the thermal elements of the print head with your hands.
!NEVER use metallic or piercing elements to clean the print head, as they
could scratch it.
!The print head could be hot after printing. Make sure it has thoroughly
cooled down before proceeding to clean it.
!Before connecting any communication data cable, check the printer is
working properly by executing the self-test.
Thermal Head
Pa
p
er cutter
Head lever

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0 – INTRODUCTION
The TK51/IF9000 is a very high-performance embedded thermal line interface. Its
compact and functional design covers many professional uses. it is capable of printing
text, graphics, logo and bar code.
The TK51/IF9000 is intended to be integrated into the user’s final system. Its structure
allows an easy access both to the interface or the critical parts of the mechanism.
So, special care must be taken at choosing the TK51/IF9000 location, access and
protection from external damage. It can be used in laboratories, industrial and
professional environments.
The main features of the TK51/IF9000 are:
•Simple installation and easy maintenance.
•Low noise thermal printing.
•Three paper widths available (60mm, 80 mm or 112 mm) depending on the SEIKO
LTP9000 series printing mechanism used.
•High printing speed up to 250mm/s.
•Line printing method: Printing is performed every time a text line is filled.
•High reliability: 15 million lines.
•Single 24V DC power supply.
•No-paper, paper-near-end, head up and ticket pick up sensors.
•High resolution printing (8 dots/mm).
•IEEE 1284 parallel, serial RS232C or USB data input interface on-board.
•Two internal character fonts (Font A = 12x24dots. Font B = 8x16dots).
•Scalable font (independent scale in X / Y-axis), up to 64 times.
•Bold, reverse, rotate and inverse character capabilities.
•Underline mode text, 1-dot or 2-dots thickness selectable.
•Windows character font load capability.
•Programmable character and line space.
•Graphic bitmap printing capabilities.
•Several format Bar Code: Code39, EAN13, ITF and Code128.
•512 kbytes of buffer for data input.
•Control code based on ESC / POS commands (*).
•Hexadecimal mode for easy software debugging.
•Partial-cut or full cut selectable by software.
•Logo load capability, through Windows driver.
•Automatic paper load.
•Self test, hexadecimal mode and configuration mode features.
•Windows 95, 98, XP & 2000 drivers and showing program.
•Linux driver.
•Firmware update through the communication port (**).
This manual is the printer operations’ guide and is intended for the designer’s
application. The following sections contain a detailed description of both the hardware
and the configuration software that allow obtaining the maximum benefit of the
TK51/IF9000.
(*) ESC/POS are registered trademarks of Seiko Epson Corporation.
(**) Contact with FENIX IMVCO or your distributor.

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1 – GENERAL SPECIFICATIONS
1.1- PRINTING SPECIFICATIONS
a) Printing method: Thermal line printing.
b) Print Head:
Printing mechanism model type Number of dots
CAP9247 (60 mm paper-width model) 448 dots (= 56mm)
CAP9347 (80 mm paper-width model) 640 dots (= 80mm)
CAP9447 (112 mm paper-width model) 832 dots (= 104mm)
c) Dot density: 203 dpi x 203 dpi (dpi: dots per inch (25.4mm)).
(8 dots/mm)
d) Printing speed: up to 250 mm/s.
Automatic paper load: 100mm/s approx.
✔Printing speed may be slower, depending on the
data transmission speed and combination of
control commands, environmental conditions,
or selection of the print density.
e) Paper feeding: Feeding method "unidirectional with friction feed.
Feeding pitch "0,125mm (0,0049”)
Feeding speed "250 mm/s maximum
1.2- CHARACTER SPECIFICATIONS
a) Character code tables: PC437 (USA, Europe Standard). Others Windows
character tables can be loaded by FENIX application (See APENDIX G).
b) Character structure: Font A: 12 x 24 dots (1,5 x 3 mm).
Font B: 8 x 16 dots (1 x 2 mm).
Font A is selected as the default.

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1.3- ELECTRICAL CHARACTERISTICS
a) Supply voltage: +24V DC ±2.4V (±10%)
b) Current consumption (at 24V):
Number of
simultaneously
activated dots Maximum
640 Rated 29,4 A
26,7 A
Maximum
448 Rated 20,6 A
18,7 A
Maximum
256 Rated 11,8 A
10,7 A
Maximum
128 Rated 5,9 A
5,4 A
1.4- PAPER REQUIREMENTS
a) Paper type: Single-ply thermal paper roll
b) Specified thermal paper:
TF11KS-ET
TC11KS-LH
TL69KS-LH
TC98KS-LS
A different paper type may give a different print quality.
The paper thickness must be less than 155µ
µµ
µm.
c) Paper width:
CAP9247 mechanisms CAP9347 mechanisms CAP9447 mechanisms
60 mm /+0, -1
58 mm/+0, -1 82,55 mm/+0, -1 80 mm/+0, -1 112 mm/+0, -1
d) Paper roll:
25 mm
MINIMUM 150 mm MAXIMUM

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1.5- ENVIRONMENTAL CONDITIONS
a) Operating Temperature: -20ºC to 80ºC
b) Operating humidity: 10 to 80% (34ºC (93.2ºF) at 80%, non-condensing)
Fig. 1.1-Operating Temperature and Humidity Range
1.6- INTERNAL BUFFER
The TK51/IF9000 printer has a 512 Kbytes receiving buffer memory.
This big receiving buffer allows the printer working in the following way: Firstly, all data
is buffered, and afterwards the printing is performed at the maximum possible speed
without being affected by the communications time processing.

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2 – INSTALLATION
2.1- TK51 INSTALLATION CONSIDERATIONS
There are some general considerations to take into account when installing the
TK51printer.
A wrong installation might cause many issues like paper jam, difficult maintenance of
the printer, difficulty in changing the paper roll, etc. Moreover, a correct installation can
prevent the printer from being damaged by external agents, such as weather or
vandalism.
The TK51 is intended to be used in combination with the SEIKO CAP9000 series printer
mechanisms, and so, to result in a finished printer. This printer has been thought to be
installed in a bigger case or structure, or another kind of appropriate chassis.
The basic points that a correct installation must follow are:
•Smooth exit of the ticket. Prevent problems with static electricity due to the nature of
the used materials. Be sure to make a good earth connection.
•Avoid the final user’s access to the printer outlet.
•Allow enough space and accessibility to reach the maintenance procedure points in
case it is needed. These points are:
✔Printer Head and auto-cutter.
✔Paper roll.
✔Connectors.
✔Leds and push-buttons.
Fig. 2.1- Accessibility to reach the maintenance.
Connectors
Cutter
unblock Print Head
Paper Roll
Leds and buttons

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For these reasons, FENIX suggests the following systems as solutions to a correct
installation:
Fig. 2.2- Installation considerations.
2.1.1- TK51 TENSION ROLLER
When big paper rolls are being used, a damping system to avoid any sudden change in
the paper strain (over 0,98N) is needful, since the step motor has the smallest driving
torque when it reaches the highest speed (250 mm/s). So, the backlash of paper
feeding system can be avoided.
The following picture shows the FENIX TK51 tension roller performed.
Fig. 2.3- TK51 tension roller.
8mm
67 mm for TK51-60
87 mm for TK51-80
119 mm for TK51-112
175 mm minimum
approx.
250 mm minimum
approx.

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2.2- TK51/IF9000 USER INTERFACE ELEMENTS
In the TK51/IF9000 user can find the following connectors:
•CN1: Power supply connector.
•CNx: Serial RS-232, parallel CENTRONICS or USB connector.
•CN2: Mechanism connector.
•CN9: Led and Buttons connector.
•CN8: Paper-near-end connector.
•CN9: Ticket pick-up connector.
Fig. 2.4- TK51/IF9000 connectors location.
CN1:
power supply
CN2:
LTP9000 serie
printer mechanisms
CN7: leds and buttons
Communication
interface:
"Parallel Centronics,
"RS-232 or
"USB
CN8: paper-near-end sensor
CN9: Ticket pick-up sensor

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2.2.1- POWER SUPPLY CONNECTOR
Attach power supply cable to the 3-pin micro connector. Verify power supply voltage
before making the connection.
The connector is a female 3-pin HOSIDEN type, which have the following pin-out:
Fig. 2.5- Power supply connector as seen from outside the TK51/IF9000.
"
""
"Use a 3-pin DC jack KPP-3P model or equivalent.
The TK51/IF9000 requires one power source: VCC (24V DC) for driving the thermal
head and motor. The power supply must meet the following conditions:
VCC: 24V DC +/- 2,4V (10%)
NOTES
✔If the number of dots that are energized at the same time is increased, a higher
current will flow; therefore, the user should use a power supply with an adequate
current capability.
✔When designing lines and bit images, take the printing ratio and print duty into
consideration.
✔Print quality may be poor if the printing ratio or print duty is high.
Definitions:
•Printing ratio: the number of printing dots (energizing pulses)/dot line.
•Print duty: the number of printing dots (energizing pulses)/ elements/ paper
feed amount (two steps, including non-printing area)
WARNING: Beware not to invert the polarity of power supply. This may
irremediably damage the printer.
IMPORTANT NOTE ABOUT TK51/IF9000 POWER SUPPLY:
The current demand depends on the density of the printout. A 150W power
supply covers all adverse possibility (printing ratio of 100% black at any
temperature). However, if the average print ratio is not over 25%, a 60W power
supply can be used. Anyway, power supply must meet the peaks current that
mechanism requires, which are determined by the following formula:
Ipeak = [24 / 600] x number of printing dots
GN
D
24V DC nc

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A very important point to be aware of is the necessity of keeping the supply
wiring the shortest possible. When the printer is supplied with 24VDC, if the input
voltage drops a significant quantity the printer could stop working normally. The
longest (and thinnest) the wire the higher the impedance and therefore less
voltage will have in the input, especially during the high peak currents.
FENIX offers a 60W power supply as an accessory option (See APPENDIX F –
HOW TO ORDER).
As an example, next figure shows the relationship between a sample ticket and
the input current measured.
Fig. 2.6- Current
consumption
example.
I(motor) = 0,5 A
(feed paper without printing)
Istandby = 0,38A
Rshunt=0,02 Ω
Vi
=
12V
1 dot line
2 dot lines
I
p
eak = 3
,
9A
I
p
eak = 5
,
1A
(
5ms
)
Ipeak= 2,2A ( 40ms)
Input current

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2.2.1.a) EARTH–GND connection.
The IF9000 arranges a terminal to connect the system EARTH to printer GND signal.
Between both terminals, there is a filter circuit implemented:
This RC filter avoids a current drift when the EARTH circuit is not good (there is not
EARTH connection or is defective, other noisy device in the system is injecting spurious
in the main power supply, etc).
If the installation system EARTH is very good (impedance<5 Ohm), it will be possible to
have a direct and optimum EARTH-GND connection, by shorting C3 pads (it is not
mounted by default).
2.2.2- SERIAL RS-232 CONNECTOR
2.2.2.1- Specifications
•Data asynchronous serial transmission.
•Handshaking: CTS/RTS control.
•Signal levels (RS232): Logic “1” = - 3V to –15V.
Logic “0” = +3V to +15V.
•Baud rate: 9600, 19200, 38400, 115200 bps (bits per second).
•Data word length: 8 bits (fixed).
•Parity Settings: None, even, odd.
•Stop bits: Fixed to 1.
•Connector (printer side): Male D-SUB9 pin connector.
NOTE The baud rate, and parity settings can be changed (refer to point 3.4.2-
PROGRAMMING MODE).
EARTH
C3
R53
GND
1M

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Pin Signal
name Signal direction (from
the printer side) Function
2 RXD Input Data reception line.
3 TXD Output Data transmission line.
4/DTR Output This signal indicates whether an error occurs.
Logic “0” indicates that the printer is connected and ready to
receive data, and logic “1” indicates that the printer is offline.
The printer goes offline:
1) When the power is turned on until the printer becomes
ready for data transmission after it is initialized by a reset.
2) When the platen is open.
3) When the printer stops printing due to a paper-end.
4) When an error has occurred
5GND - Signal ground.
6 /DSR Input This signal indicates whether the host computer can receive
data.
7/RTS Output This signal indicates whether the printer is busy. SPACE
indicates that the printer is ready to receive data, and MARK
indicates that the printer is busy.
8 /CTS Input This signal indicates whether the host computer can receive
data.
(*) reception buffer is full when it increases till the maximum capacity (512 Kbytes).
Table 2.1- Serial port pin-out.
Fig. 2.7- Serial interface connector
as seen from outside the
TK51/IF9000.
2.2.2.2- Serial interface connection example
The cable, which has the signal connection, as shown below must be used.
PRINTER SIDE USER SIDE (PC)
D-SUB9
Pin Num.
Signal
Name
Signal
Name
D-SUB9
Pin Num.
1 (NC) DCD 1
2 RxD RxD 2
3 TxD TxD 3
4 /DTR /DTR 4
5 SG SG 5
6 /DSR /DSR 6
7 /RTS /RTS 7
8 /CTS /CTS 8
9 (NC) RI 9
NC: Not Connected
Table 2.2- Serial interface connection example.
Pin 9
Pin 5
Pin 6
Pin 1

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The TK51/IF9000 serial input/output signals (RXD, /RTS and TXD) can be RS232C
level or TTL level (see APPENDIX F- HOW TO ORDER).
The TK51/if9000 receives and checks serial data according to the transmission baud
rate programmed.
If the input data is not printed correctly, the transmission conditions between the host
device and the TK51/IF9000 do not probably match. If this happens, the character “?”
is continuously printed and user must adjust the transmission conditions so that they
match.
Serial data output (TXD): output pin, SUB-D9-3
•Data is output according to the programmed transmission conditions.
Serial data input (RXD): input pin, SUB-D9-2
•Data input port
•Data is input from the host device according to the programmed transmission
conditions.
Serial busy (/RTS): output pin, SUB-D9-7
•Indicates whether or not the printer is ready to receive data.
•When the /RTS signal is “LOW”, data can be input.
Data terminal ready (/DTR): output pin, SUB-D9-4
•Indicates whether the printer is ON_LINE/OFF_LINE.
•When the /DTR signal is “LOW”, the printer is ON_LINE.
•
2.2.3- CENTRONICS PARALLEL CONNECTOR
The TK51/IF9000 performs the IEE1284 protocol (NIBBLE MODE).
Copyright © 1994 by the Institute of Electrical and Electronic Engineers, Inc.
2.2.3.1-Compatibility mode (Data transmission from host system to the printer:
Centronics compatible)
*Any system sending data to the printer (PC, PLC, custom board, etc) is considered to
be a host system.
The compatibility mode supports compatibility with the Centronics parallel interface.
Specifications
Data transmission: 8-bit parallel
Synchronization: nSTB signal externally provided
Protocol: nACK (acknowledge) and BUSY signals
Signal levels: TTL compatible
Connector (user side): 36 pin MALE CENTRONICS (IEEE 1284 Type B).

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•Switching between online and offline mode
The printer does not provide any switch for online/offline mode. The printer is in offline
mode in the following cases:
a) When powering on or until the printer becomes ready for data transmission
b) After it is initialized by the reset signal from the interface
c) During the self-test.
d) When the platen is opened.
e) When the printer stops printing due to ‘out of paper’.
f) When a temporal voltage abnormality happens to the power supply.
g) When an error occurs.
Timing diagram of data reception
Data n Data n+1
Data
tHold
nStrobe
tSetup tSTB
Busy Peripheral Busy
TReady tBUSY
nAck
tnBUSY
tReply tACK
tNext
Specification
Description Symbol Min(ns) Max(ns)
Data hold time tHold 750 --
Data setup time tSetup 750 --
STROBE pulse width tSTB 750 --
READY cycle idle time tReady 0 --
BUSY output delay time tBUSY 0 500
Data processing time tReply 0 ∞
ACKNLG pulse width tACK 500 10µs
BUSY release time tnBUSY 0 ∞
ACK cycle idle time tNext 0 --

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Reverse mode (Data transmission from the printer to the host system)
The transmission of the printer status to the host system is implemented according to
the IEEE1284 standard (NIBBLE MODE).
2.2.3.2-Parallel interface pins assignment for each mode
Pin
Number
Source Compatibility Mode Nibble Mode
D-SUB25 PC
PIN Num.
1 Host /Strobe HostClk 1
2 Host/Ptr Data0 (LSB) Data0 (LSB) 2
3 Host/Ptr Data1 Data1 3
4 Host/Ptr Data2 Data2 4
5 Host/Ptr Data3 Data3 5
6 Host/Ptr Data4 Data4 6
7 Host/Ptr Data5 Data5 7
8 Host/Ptr Data6 Data6 8
9 Host/Ptr Data7 (MSB) Data7 (MSB) 9
10 Printer /Ack PrtClk 10
11 Printer Busy PrtBusy/Data3,7 11
12 Printer PE AckDataReq/Data2,6 12
13 Printer Select Xflag/Data1,5 13
14 Host /Autofeed HostBusy 14
15 Nc Nd
16 GND GND 18-25
17 FG FG 18-25
18 Printer Logic-H Logic-H
19-30 GND GND 18-25
31 Host /Init /Init 16
32 Printer /Error /DataAvail/Data0,4 15
33 GND Nd
34 Printer DK_status Nd
35 Printer +5v Nd
36 Host /SelectIn 1284-Active 17
Nc: Not connected Nd: Not defined
Table 2.3- PC parallel connector (DB25).