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- From: Tomi Engdahl <then@snakemail.hut.fi>
- Date: Fri, 29 Apr 1994 13:28:37 +0200 (EET DST)
-
-
- T{ss{ hiirien speksit englanniksi. Ei nyt ihan t{ydelliset, mutta kyll{
- aika kattavat.
-
-
- Serial mouse
-
- Voltage levels:
- Mouse takes standard RS-232C output signals (+-12V) as its input signals.
- Those outputs are in +12V when mouse is operated. Mouse takes some current
- >from each of the RS-232C port output lines it is connected (about 10mA).
- Mouse send data to computer in levels that RS-232C receiver chip in the
- computer can uderstand as RS-232C input levels. Mouse outputs are normally
- something like +-5V, 0..5V or sometimes +-12V. Mouse electronics
- normally use +5V voltage.
-
-
- Microsoft serial mouse
-
- Pins used:
- TD, RTS and DTR are used only as power source for the mouse.
- RD is used to receive data from mouse.
-
- Serial data parameters: 1200bps, 7 databits, 1 stop-bit
-
- Data packet format:
- Data packet is 3 byte packet. It is send to the computer every time
- mouse state changes (mouse moves or keys are pressed/released).
-
- D7 D6 D5 D4 D3 D2 D1 D0
-
- 1. X 1 LB RB Y7 Y6 X7 X6
- 2. X 0 X5 X4 X3 X2 X1 X0
- 3. X 0 Y5 Y4 Y3 Y2 Y1 Y0
-
- The byte marked with 1. is send first, then the others. The bit D6
- in the first byte is used for syncronizing the software to mouse
- packets if it goes out of sync.
-
- LB is the state of the left button (0 means pressed down)
- RB is the state of the right button (0 means pressed down)
- X7-X0 movement in X direction since last packet (signed byte)
- Y7-Y0 movement in Y direction since last packet (signed byte)
-
-
- Mouse systems mouse
-
- Serial data parameters: 1200bps, 8 databits, 1 stop-bit
-
- The data is sent in 5 byte packets in following format:
-
- D7 D6 D5 D4 D3 D2 D1 D0
-
- 1. 1 0 0 0 0 LB CB RB
- 2. X7 X6 X5 X4 X3 X2 X1 X0
- 3. Y7 Y6 Y5 Y4 Y3 Y4 Y1 Y0
- 4.
- 5.
-
- LB is left button state (0=pressed, 1=released)
- CB is center button state (0=pressed, 1=released)
- RB is right button state (0=pressed, 1=released)
- X7-X0 movement in X direction since last packet in signed byte
- format (-128..+127), positive direction right
- Y7-Y0 movement in Y direction since last packet in signed byte
- format (-128..+127), positive direction up
-
- The last two bytes in the packet (bytes 4 and 5) contains
- information about movement data send in last packet. I have not
- found exact information about those bytes. I have not also found
- any use for such a information (maybe it is for syncronization
- or something like that).
-
-
-
-
-
- --
- Tomi.Engdahl@hut.fi Helsinki University of Technology
- G=Tomi S=Engdahl O=hut ADMD=fumail C=fi Department of Computer Science
- # This text is provided "as is" without any express or implied warranty #
-
-
-