Samsung Electro Mechanics SEM-DTLD User Manual

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Document ID	45159
Application ID	soafpRfMQj5hAmgO1Zcy+A==
Document Description	Users Manual
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Permanent Confidential	No
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Document Type	User Manual
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Filesize	55.25kB (690585 bits)
Date Submitted	1999-06-30 00:00:00
Date Available	1999-07-22 00:00:00
Creation Date	1999-06-30 14:55:13
Producing Software	Acrobat 3.0 Scan Plug-in
Document Lastmod	1999-06-30 14:56:09
Document Title	Users Manual
Document Creator	Acrobat 3.0 Scan Plug-in

w KEYBOARD SPECIFICATION
T0
PRODUCT MODEL 1 KEYBOARD
CUSTOMER MODEL 1 SEM-DTLD
SAMSUNG ELECTRO-MECHANICS C0,Ltd.
314, Maetan-S Dong, PaIdaI-Gu, Suwon, Kyungki-Do, Korea
Tel : +82—331—210—6350, 5381
Fax : +82—331—210—5226
Any uncontrolled printed copy of this document is for reference purposes only unless
expressly authorized by SEMCO. Authorization must include part number and revision,
CODE SEM -DTLD APP ROVALS
REVISION KS7-01—0 DRAWN
SIZE A4 CHECKED
SCALE 1.0 ISSUED
Revr KS7-01-0 I Samsung Eieciro-Mechanics Co, Ltdr Page 1
w KEYBOARD SPECIFICATION
FCC NOTICE
This equipment generates and uses radio frequency energy and if not installed and used
properly, that is, in strict accordance with the instructions listed in this user‘s manual, may
cause interference to radio and television reception
It has been tested and found to comply with the limits for a CLASS B computing device in
accordance with me specifications in SUB PART B of part 15 of the FCC rules, which are
designed to provide reasonable protection against such interference in a residential
installation. if this equipment does cause interference to radio or television reception, which
can be determined by turning off the equipment, and seeing if the interference stops, the user
is encouraged to try and correct the interference by one or more of the following measures :
1. Reorient the receiving antenna,
2. Relocate the computer with respect to the radio or television.
3. Move the computer further away from the radio or television.
4, Plug the computer into a different outlet so the computer and television are on different
circuits.
NOTE : This unit was tested with shielded cables on the peripheral devices. Shielded cables
must be used with the unit to insure compliance,
NOTE : The manufacturer is not responsible for any radio or TV interference caused by
unauthorized modifications to this equipment, such modifications could void the
users authority to operate the equipment.
Rev. KS7-01-D Samsung Electra-Mechanics Co, Ltd.
@ KEYBOARD SPECIFICATION
1. PRODUCT OVERVIEW
This specification defines the mechanical, electrical, and functional specifications of the
SAMSUNG Electra-Mechanics 106 keys Korean version Windows 95 compatible keyboard.
it also defines the operational characteristics, environmental specification, compliance
certifications, ergonomic considerations, and testability requirements of this keyboard. This
keyboard is a low profile, 106 keys, detachable unit, with three additional keys specific to
Windows 95. All keys generate a unique output code upon depression and a similar but
unique output code upon switch release The communication with the host system is a via
a bi-directional serial link using AT protocol. The key top layout, switch coding, serial
communication and functionality is compatible with the IBM AT enhanced keyboard,
especially under the Novell (non dedicated), XENIX, UNIX, and 08/2 operating
environments.
2. FUNCTIONAL DESCRIPTIONS
2.1 KEYBOARD SCAN CODES
This keyboard contains 3 scan code sets. The system defaults to scan set2t but can
be switched to set 1 or set 3. If the keyboard is using communication mode 1
protocol, only scan code set 1 can be used. Tables 1, 2, and 3 list the key numbers
and three scan codes sets in hexadecimal values. All the keys are typematic except for
the Pause key. When a key is pressed down, the make scan code is sent to the
system, When the key is released, its break code is sent. If two or more keys are held
down, only the last key pressed repeats at the typematic rate. Typematic Operation
stops when the last pressed key is released. even if other keys are being released or
some other keys are still held down. Scan code set 3 is programmable by the user.
Programmed key(s) does not change when switching between scan code sets,
2.2 PROTOCOL
This keyboard communicates with the system in AT protocol only, XT protocol is not
supported.
2,2,1 COMMUNICATION MODE(AT)
Data Format 11bits(positive logic)
o x x x x x x x x P 1
start so B1 32 as B4 55 B6 B7 Parity stop
(LSB) (ODD)
in idle state, the clock and data lines are in the high state,
Keyboard Data Output - When the keyboard is ready to send data to system, it
first checks clock and data lines. If either one is in the inactive state, data is stored
in the keyboard buffer. If both are in the active state. keyboard sends stait bit, 8
data bits, the parity bit, and the stop bit. Data will be valid before the trailing edge
and after the leading edge of the clock pulse. During the transmission the keyboard
checks the clock line at least every 60 microseconds. If the system lowers the clock
Rev. KS7-D1-0 Samsung Electra-Mechanics Co, Ltd.
w KEYBOARD SPECIFICATION
line before the leading edge of the 10th clock, the keyboard stops sending, then
buffers the data and returns clock and data lines to high state.
Keyboard Data Input - When the system is ready to send data to keyboard, it first
checks clock line to see if keyboard is sending data. If keyboard is not sending data
or it is sending data but has not reached the 10th clock, the system can inhibit the
interface by forcing the clock line low for more than 60 microseconds and prepares
to send data
This keyboard checks clock line status at least every 3 milliseconds. If a system
Request To Send (RTS) is detected, the keyboard clocks 11bits in. After the 10th bit,
the keyboard checks for a high state in data line then pulls it low and clocks one
more bit to signal the system that data has been received. If data is low after the 10
th bit, it indicates a frame error. The keyboard continues to count until data line
goes high, then pulls it low and issues a RESEND to the system. The keyboard is
allowed 3 milliseconds to respond to any command except RESET.
2.2.2 COMMANDS FROM THE SYSTEM
The system can send commands to the keyboard at any time. The keyboard needs
to respond within 3 milliseconds, unless the system prevents keyboard output, when
doing self test, or executing a RESET.
The followings are the keyboard input commands and the actions that keyboard
needs to take.
SET/RESET STATUS INDICATOR (HEX ED)
- Responds with ACK.
- Receives option byte (or another command)
- Responds with ACK.
- Updates status indicators'.
BO=1 -> SCROLL LOCK INDICATOR is turned on.
B1=1 -> NUM LOCK INDICATOR is turned on.
B2=1 —> CAPS LOCK INDICATOR is tumed on.
BS-B7—> RESERVED (MUST BE 0).
— Returns to previous scanning state.
' Scroll Lock, Num Lock, and Caps Lock indicators are driven by the host
system.
ECHO (HEX EE)
- Responds with EE hex,
- Returns to previous scanning state.
INVALID COMMANDS (HEX EF AND F1)
- Returns a RESEND command.
- Returns to previous scanning state.
Rev. KS7-01-0 Samsung EIectro—Mechanics Co, Ltd.
w KEYBOARD SPECIFICATION
SELECT ALTERNATE SCAN CODES (HEX F0)
— Responds with ACK.
- Clears out buffer.
- Sets typematic rate/delay,
- Clears last typematic key.
- Receives option byte.
- Responds with ACK
— Opu’on byte = 00 -> responds ACK, then returns scan code set number
01 -> selects scan code set 1
02 -> selects scan code set 2
03 -> selects scan code set 3
- Returns to previous scanning rate,
READ ID (HEX F2)
- Responds with ACK
— Discontinues scanning,
— Sends two ID bytes. The second byte will be sent wimin 500ms after first byte.
— Returns scanning.
SET TYPEMATIC RATE/DELAY(HEX F3)
- Responds with ACK.
- Receives rate/delay value(or another command),
- Responds with ACK.
- Sets rate/delay.
Repeat period=(a+A)'(2“B)*0.00417 seconds
A = binary value of bits 2, 1, and 0
B = binary value of bits 4 and 3
Delay = (C+1)'250 milliseconds
C = binary value of bits 6 and 5. Bit 7 is always 0
Default rate = 10.9 chars/sec + 20 %
Default delay = 500 ms +/- 20 %
- Returns to previous scanning state.
ENABLE (HEX F4)
- Responds with ACK.
- Clears output buffer.
- Clears last typematic key,
- Starts scanning.
DEFAULT DISABLE (HEX F5)
— Responds with ACK.
- Resets all conditions to power-on state.
— Clears out buffer.
- Sets the default key type (scan code set 3 only).
- Sets typematic rate/delay.
- Clears last typematic key.
Rev. KS7-01~Cl Samsung EIectro—Mechanics Co, Ltd.
w KEYBOARD SPECIFICATION
SET DEFAULT (HEX F6)
— Responds with ACK
- Resets all conditions to power-on state
, Clears out buffert
- Sets the default key type(scan code set 3 only)
- Sets typematic rate/delay.
- Clears last typematic key.
- Continues scanning
SET ALL KEYS (HEX F7,F8,F9,FA)
- Responds wim ACK,
- Clears out buffer.
- Sets all key type(affect only scan code set 3 operation)
F7 -> Typematic
F8 -> Make/Break
F9 -> Make
FA -> Typematic/MakelBreak
‘ Returns to previous scanning rate.
SET KEYTYPE(HEX FB,FC,FD)
- Responds with ACK.
— Clears out buffer
— Receives key lD byte.
- Responds with ACK.
- Sets key ID type (affect only scan code set 3 operation)
FB -> Typematic
F0 -> make/Break
FD -> Make
- Returns to previous scanning state
RESEND (HEX FE)
- Sends the previous output again. If the previous byte is RESEND, the last byte
before RESEND will be sent.
RESET (HEX FF)
- Responds with ACK
- Checks clock and data lines in the high state for at least 500 microseconds
or receives another command.
2,2.3 COMMANDS TO THE SYSTEM
The following are the keyboard output commands
ACKNOWLEDGE (HEX FA)
The keyboard sends an acknowledge in response to any valid command from the
system except for RESEND and ECH04
Revt KS7-01-0 Samsung EIectro-Mechanics Co, Ltd
@ KEYBOARD SPECIFICATION
BAT COMPLETION CODE (HEX AA)
This command is issued after successful completion of keyboard self test.
BAT FAILURE CODE (HEX PC)
If a BAT failure occurs, the keyboard sends this code, discontinues scanning, and
waits for a system response or reset,
ECHO (HEX EE)
The keyboard sends this code in response to an ECHO command.
KEYBOARD ID (HEX 53AB)
The 2 byte ID is issued to response to READ ID command. The low byte is sent
first followed by the high byte.
KEYBOARD BUFFER OVERRUN (HEX 00 or FF)
if keyboard buffer overflows, the overrun code will replace the last byte in the buffer.
If the keyboard is using scan code sett, the code is hex FF. For sets2 and 3, the
code is hex00.
RESEND (HEX FE)
When the keyboard receives an invalid input or any input with incorrect parity, the
RESEND command is sent.
2.3 KEY ROLLOVER
This keyboard is adopting M-key rollover.
2.4 KEYBOARD BUFFER
This keyboard will buffer 16 bytes in a first-in-first-out order when the system is able to
receive scan codes from the keyboard. The response codes and repeated codes will
not be buffered.
If keystrokes generate a multiple-byte sequence, the entire sequence must fit into the
buffer or the keystroke is discarded and a buffer-overrun condition occurs.
2.5 POWER-ON RESET AND SELF-TEST
This keyboard contains reset circuitry. The duration of the keyboard POWER-ON—
RESET (POR) is within 150 milliseconds to 2.0 seconds after the power is applied to
the keyboard.
After executing POR, the keyboard executes a self test. The self test includes a
processor test, a checksum of the ROM, and a RAM test. The LEDs are turned on at
the beginning and off at the end of the self test. The self test takes a minimum 300
milliseconds and a maximum 500 milliseconds.
If the self test is successful, a completion code AA hex is sent to the system and the
keyboard starts scanning. If the self test fails, and error code is sent, the keyboard is
Rev, Ks7—01~0 Samsung EIectro-Mechanics Co, Ltd.
w KEYBOARD SPECIFICATION
disabled and waits for a command from the system. The completion codes are sent
between 450 milliseconds and 25 seconds after POR, and between 300 and 500
milliseconds after a RESET command is acknowledged.
2.6 HOT PLUG CAPABILITY
This keyboard is designed to allow plugging and unplugging into a host system while
the host system is under power. This action does not cause any destruct'we effects on
the host system or keyboard. The keyboard then continues normal operation as if a
power on reset condition occurred.
The interface consists of two bi-directional lines, clock and data lines, which can be
controlled by TI‘L open collector drives on either side. The typical interface circuit
consists of a 2K ohm pull-up resistor.
2.7 CIRCUIT DIAGRAM
See Appendix A-t.
2.9 PART LIST
See Appendix A-2.
2.8 MATRIX
See Appendix A-3
3. CONNECTION
3.1 SIGNAL CONNECTOR
The connector is a six pin Mini-Din connector (below)
Rev. KS7—01-D Samsung ElectrdMechanics Co, Ltd.
W KEYBOARD SPECIFICATION
3.2 POWER REQUIREMENTS
Input Voltage = 5V 15%
Input Current = 200mA max
4. MECHANICAL DESCRIPTIONS
441 KEYBOARD LAYOUT, LEGENDS AND COLORS
See Figure 4—1 for layout and legends.
See Figure 4—4 for colors.
Detailed key layout and characters is in Appendix A-5
In” Mllfl m-
Figure 4-1 Keyboard Layout.
4.2 KEYBOARD CABLE
See Figure 4-2 for cable length.
1,800mm 1 100mm
Hflflflfif 1
Figure 4-2 Keyboard Cable Length
Samsung Electra-Mechanics Co, leA

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Modify Date                     : 1999:06:30 14:56:09
Creator                         : Acrobat 3.0 Scan Plug-in
Producer                        : Acrobat 3.0 Scan Plug-in
Create Date                     : 1999:06:30 14:55:13
Page Count                      : 9

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