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+# Sun to USB keyboard protocol converter
+
+A converter for using non-USB Sun keyboards.
+
+Original code from the [TMK firmware](https://github.com/tmk/tmk_keyboard/tree/master/converter/sun_usb). Ported to QMK by [Yann Hodique](https://github.com/sigma).
+
+Keyboard Maintainer: [Yann Hodique](https://github.com/sigma)  
+Hardware Supported: See hardware section below  
+Hardware Availability: self-built
+
+Make example for this keyboard (after setting up your build environment):
+
+    make converter/sun_usb/type5:default
+
+See [build environment setup](https://docs.qmk.fm/build_environment_setup.html) then the [make instructions](https://docs.qmk.fm/make_instructions.html) for more information.
+
+
+## Hardware
+
+Target MCU is ATMega32u4 but other USB capable AVR will also work. The maintainer mostly uses Teensy 2.0 boards.
+Supported keyboards: Sun Type 3 and 5 Keyboards,
+
+### Connector
+
+8Pin mini DIN
+
+       ___ ___
+      /  |_|  \
+     / 8  7  6 \
+    | 5    4  3 |
+     \_ 2   1 _/
+       \_____/
+    (receptacle)
+
+
+Wiring:
+
+    Pin mini DIN        MCU
+    ----------------------------------
+    1   GND             GND
+    2   GND             GND
+    3   5V
+    4   RX/TX(Mouse)
+    5   RX              PD3
+    6   TX              PD2
+    7   GND             GND
+    8   5V              VCC
+
+
+### Protocol
+
+    Signal: Asynchronous, Negative logic, 1200baud, No Flow control
+    Frame format: 1-Start bit, 8-Data bits, No-Parity, 1-Stop bit
+
+    AVR USART engine expects positive logic while Sun keyboard signal is negative.
+    To use AVR UART engine you need external inverter in front of RX and TX pin.
+    Otherwise you can software serial routine to communicate the keyboard.
+
+This converter uses software method, you doesn't need any inverter part.
+
+
+Commands From System To Keyboard
+
+    0x01 Reset
+            Keyboard responds with following byte sequence:
+            Success: 0xFF 0x04 0x7F
+            Fail:    0x7E 0x01 0x7F
+    0x02 Bell On
+    0x03 Bell Off
+    0x0A Click On
+    0x0B Click Off
+    0x0E LED
+            followed by LED status byte:
+            bit: 3       2       1       0
+            LED: CapsLk  ScrLk   Compose NumLk
+    0x0F Layout
+            Keyboard responds with 'Layout Response' 0xFE 0xXX
+
+Commands From Keyboard To System
+
+    0x7F Idle
+            means no keys pressed.
+    0xFE Layout Response
+    0xFF Reset Response(followed by 0x04)
+     
+References
+
+* http://kentie.net/article/sunkbd/page2.htm
+* http://kentie.net/article/sunkbd/KBD.pdf