CONTENTS 1. EMI GUIDELINES 2. INTRODUCTION 3. OPERATION 3.1 PC/AT, PS/2 Mode Selection 3.2 Mode Indicators 3.3 Type Ahead Capability 3.4 Thematic Delay & Repeat Rate 35 Pseudo N-key Roll-over Capability 3.6 Diagnostic Test 4. CABLE & CONNECTOR 5. TECHNICAL DATA 5.1 Electrical Characteristics 5.2 Mechanical Characteristics 5.
~ F.C.C. GUIDELINES 1 WARNING: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
INTRODUCTION 2 Thank you for choosing this innovative product. This keyboard is one of the SK-2800 series products, which are 104/105/106/107/109 keys enhanced keyboards for IBM PC/AT, PS/2 and its compatibles. OPERATION 3 3.1 PC/AT, PS/2 This keyboard is designed to be AT,PS/2 mode Mode Selection selection is done by auto-switchable 3.2 Mode Indicators 3.3 Type Ahead Capability There are three LED on the keyboard to indicate Caps Lock’, Num Lock’ and ‘Scroll Lock. The LED are 'toggled'.
3.4 Thematic Delay and Repeat Rate 3.5 Pseudo N-Key Roll-over Capability 3.6 Diagnostic Test With the exception of the Pause key, all keys are thematic. When a key is pressed and held down, the keyboard delays 0.5 sec and begins sending a make code for that key at a rate of 10.9 characters per second. (The delay is called thematic Delay and the rate is called Repeat Rate.) If two or more keys are pressed, only the last key pressed is repeated at the repeat rate.
CABLE AND CONNECTOR The keyboard shielding cable long cable. The keyboard cable is connected to the host unit through a Din connector The following figure lists the connector pins and their signals Description Signal Pins | Connector keyboard clock 5 Vdc signal 1 keyboard data 5 Vdc signal ground power supply S Vde 5 Description Signal Pins | Connector keyboard data S Vdc signal i 2 ground power supply $ Vde 4 3 4 keyboard clock 5 Vdc signal TECHNICAL DATA 5 5.1 Electrical Input Power: +5 VDC, 40 mA max.
KEYBOARD LAYOUTS 6 SK-2800( OPTION 1: U.S.
Appendix A : PARTS LIST Part Name Description Qty Location 1 MCU SAMSUNG BBC0604 VERVE 1 ul 2 1uF/50V, 4*7mm 1 Cl 3 10uF, 4*7mm 1 C2 4 0.001uF (102) 1 C3 5 470pf 2 C4,C5 6 Induct or 1.5uH, stand 125mA 2 Li,L2 7 Induct or 3.