Hagstrom electronics Usbtousb User manual

USBtoUSB

USB Serial Port to USB

Keyboard and Mouse Action

User Manual

Toll Free 888-690-9080

Phone: (540) 465-4677 Fax: (540) 465-4678

Monday through Friday, 8:00 am to 5:00 pm (EST)

[email protected]

www.hagstromelectronics.com

1986 Junction Road, Strasburg, VA 22657

V. 09.20

HAGSTROM

ELECTRONICS, INC.

Warranty

HAGSTROM ELECTRONICS, INC. warrants this

product against defects in material or workmanship for a

period of ONE YEAR from the original purchase date. We will

repair or replace (at our option) the returned defective unit

at no charge during this warranty period.

No responsibility is assumed for any special, incidental,

or consequential damage resulting from the use of or

inability to use this product. In no case is HAGSTROM

ELECTRONICS, INC. to be liable for any amount which

exceeds the purchase price of the unit, regardless of the

claim.

No other warranty, written or verbal, is authorized. This

warranty is applicable only to units sold in the United States.

Units sold outside the United States are covered by a similar

warranty.

Great care has been taken during the assembly, testing, and burn-in of

your USBtoUSB to ensure its performance. If you have any questions,

please send us an email or give us a call. Support is available Monday

through Friday, 8:00 am to 5:00 pm (EST).

customer service email: [email protected]

Call Toll Free 888-690-9080, or (540) 465-4677

NOTICE: The USBtoUSB product is designed to be used by technically

oriented computer users.

Thank you for purchasing the model USBtoUSB Adapter.

HAGSTROM ELECTRONICS, INC.

is pleased that you have selected this product for your application.

This unit is may be used a variety of ways in order to meet your

specific requirements. Please take a few minutes to read this

manual before using your USBtoUSB.

If you have any questions about the use of the USBtoUSB not

covered in this manual, please contact us directly. We offer toll

free technical product support from 8:00am to 5:00pm M-F

Eastern Time 888-690-9080. You may also send an email to

[email protected]

We respond to all email requests within one business day.

Introduction to the USBtoUSB 3

Translation Modes of the USBtoUSB 3

ASCII Mode 3

Extended ASCII Mode 4

Key Number Mode 6

Additional Key Number Mode Commands 8

Key Number Mode Examples 9

Producing Mouse Action on the Target Computer 10

Mouse Packet Examples 12

Sending Serial Control Commands 13

USBtoUSB Configuration Program 14

USBtoUSB Connections & Specifications 17

17 2

CONTENTS

Operating Voltage 5 Volts DC +/- 5%

(Powered from USB ports)

Operating Current Less than 100 ma each port

Operating Temp. 0 to 70 Degrees C

Computer Interface USB - Target Computer

USB - Com Port Source

Cable Length Maximum 15ft each port

USB Com Port Protocol 19200, 8 , N, 1

USBtoUSB Specifications

USBtoUSB Connections

Using the included USB cables, attach the Com Port USB connector

to the computer that will be sending commands to the USBtoUSB.

Attach the KBD/MOUSE connector to the target computer where

the keyboard and mouse actions will be generated based on the

commands.

USB Com Port

device, attach

to the computer

sending the serial

commands.

USB KBD/MOUSE Port, attach

to the computer where the

keyboard and mouse actions

are to take place.

Questions or Comments?

Please send us an email!

www.hagstromelectronics.com

email: sales@hagstromelectronics.com

USB Data from USB Com

Port on one Computer

Generates Keyboard and Mouse

actions on another Computer

This port is also to be

plugged into the computer

running the USBtoUSB.exe

configuration program.

Introduction to the USBtoUSB

The USBtoUSB Keyboard/Mouse device is a product which emulates a

USB Com Port on one computer and a USB keyboard and mouse on

a target computer. Commands sent from the computer with the Com

Port produce keyboard and mouse actions on the target computer.

The USB target port of this device can be connected to any USB port

that supports a standard USB Keyboard and Mouse. No special drivers

are required. The USBtoUSB Com Port also uses standard drivers.

The USBtoUSB is configurable for three different modes of serial data

translation. This unit is shipped in ASCII mode, but can be changed to

other modes using the supplied “USBtoUSB.EXE” program.

Translation Modes of the USBtoUSB

The USBtoUSB receives data from it’s USB Com Port and translates

that data into USB keystrokes and mouse action on another computer.

USB Com Port data can be translated using one of three modes. ASCII

Mode, Extended ASCII Mode, or Key Number Mode.

ASCII MODE (Default Mode)

The ASCII mode is the default factory setting for the method of data

translation. In this mode, printable ASCII characters are sent to the

USB Com Port as a one byte value, each in the range of 0x00 to 0x7F

(0 to 127 decimal). Every character received in this mode generates it’s

corresponding USB keystroke on the computer where the USBtoUSB

KBD/MOUSE port is connected. See the ASCII table on the next page

for a list of the characters recognized and translated for ASCII mode.

Example: If a one byte value of 0x41 (decimal 65) is sent to the USB

Com Port in this mode, a capital “A” character will be produced as a

keystroke on the target computer’s USB port.

ASCII characters sent to the Com Port which are out of the 0x00 to

0x7F range will be ignored in this mode.

The configuration may also be read from the USBtoUSB unit by

selecting the button “Read From USBtoUSB”. The configuration in the

USBtoUSB attached to the computer’s USB port will be read into the

configuration parameters on the screen.

Once a configuration has been created, it is recommended that it be

stored on the computer so that it may be recalled at a later time. Use

the “File” menu to perform saving and opening of configurations.

Saving the configuration to a file on the computer provides an easy

way to be able to recall the same configuration at a later time to save

into additional USBtoUSB units.

Custom USBtoUSB Options

We offer special modifications to our standard USBtoUSB unit to conform to your exact

specifications. Customizations include different translation modes, different enclosure,

etc. just to name a few options. Let us know if you have special requirements. Please

call or email with your specific custom needs.

Note about the X and Y size settings. The information about the

screen size is important for controlling the cursor with the mouse control

packets. The program will show the current settings on the machine

where the USBtoUSB.exe program is being run.

Assuming the program is being run on the target machine, no changes

are required to the values the program populates. If the USBtoUSB will

be run on a different computer, change the X and Y settings to match

that system if they differ from the target machine’s screen resolution.

Value Character Value Character Value Character Value Character

Dec Hex Dec Hex Dec Hex Dec Hex

none

Backspace

Tab

none

Return

none

Esc

none

Space

“

‘

(

)

;

[

]

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

{

}

none

ASCII Mode Translation Table

The ASCII mode table below lists the standard ASCII characters to be

sent to the USB Com Port for producing a corresponding keystroke on

the target computer when processed by the USBtoUSB unit.

Extended ASCII Mode

The USBtoUSB Extended ASCII Mode of operation allows for the

standard ASCII character set (values 0x00 to 0x7F), and an extended

ASCII character set (values 0x80 to 0xFF). When a byte is sent to the

USB Com Port in Extended ASCII mode, it produces a USB keystroke

on the target PC which corresponds to the table on the next page.

ASCII Mode Translation Table

To configure the USBtoUSB, select the Control Mode from the

dropdown box to choose the conversion mode. Select between

ASCII (factory default), Extended ASCII, or Key Number Mode.

See pages 3-9 for a description of each of the control modes.

Next, enter the screen X and Y size for the target computer’s dis-

play settings. The X and Y sizes are used to set the USBtoUSB

internal storage such that the serial control for the mouse cursor

will better match the target system. When the USBtoUSB.exe pro-

gram is started, the X and Y values a are populated with the target

computer’s current display settings. The user may change these

if needed, but in general, the values selected by the program are

the proper values to be used. (See note on page 16)

Saving the Conﬁguration to the USBtoUSB

Once the desired parameters have been set on the USBtoUSB

Configuration Utility Screen, it must be saved to the USBtoUSB unit to

begin operation according to those settings.

Select the button “Save To USBtoUSB” to write the configuration to

the unit. Once the configuration has been written, the USBtoUSB will

restart and begin operating according to the selected mode.

Value Character Value Character Value Character Value Character

Dec Hex Dec Hex Dec Hex Dec Hex

none

Backspace

Tab

none

Return

F11

F12

none

F10

Esc

none

Space

“

‘

(

)

;

[

]

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

{

}

none

Value Character Value Character Value Character Value Character

Dec Hex Dec Hex Dec Hex Dec Hex

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

€

none

‚

„

…

†

‡

‰

‹

none

‘

’

“

”

•

–

—

™

›

none

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

nb Space

none

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

Extended ASCII Mode Translation Table

The user’s software should always open the USBtoUSB Com Port

using 19,200 BAUD, 8 Bit characters, No Parity, and One Stop

Bit.

When the USBtoUSB Com Port is attached to the user’s computer,

it will be assigned a particular Com Port Number. In order to send

communication to the USBtoUSB, the proper Com Port number

must be opened to communicate with the USBtoUSB device.

The included CD contains examples in various programming lan-

guages for sending commands to the USBtoUSB Com Port for the

different modes of translation.

Use these programming examples as a starting point for the ap-

plication software that will be used to control the keyboard and

mouse actions through the USB com port to the target computer.

USBtoUSB Conﬁguration Program

The unit features programmable settings for selecting the serial

data translation mode and setting the target computer screen size

information into the USBtoUSB unit for the user’s application.

The included CD contains the program “USBtoUSB.exe”. Copy

the entire contents of the CD to a dedicated folder on the target

computer’s drive. Once copied, run “USBtoUSB.exe”.

When using the Extended ASCII mode, characters sent to the USB

Com Port are in the range of 0x00 to 0xFF (0 to 255 decimal). The

corresponding keystrokes from the page 5 table will be generated.

Extended ASCII Mode allows for the ANSI/ISO Latin-1 character group

in the range of 0x80 to 0xFF (128 to 255 decimal) to be produced as

well as the standard 0x00 through 0x7F ASCII codes. Additionally in

this mode, the F1-F10 keys are supported for the character range of

codes 0x11 to 0x1A values respectively. F11 and F12 keys are sent for

Com Port characters of 0x0E and 0x0F in the Extended ASCII mode.

Example 1: If the value 0x41 (decimal 65) is received by the USB

Com Port in this mode, a capital “A” character will be produced on the

target computer’s USB port as a keystroke.

Example 2: If the value 0xA9 (decimal 169) is received by the USB

Com Port in this mode, a “©” character will be produced on the target

computer’s USB port as a keystroke.

Key Number Mode

The Key Number Mode provides complete control of the generation of

the make (activation) and break (deactivation) of any standard keyboard

key on the target computer. In this mode, a single byte sent to the USB

Com Port will command the make or break of a specific keyboard

key at the target computer. This mode allows for generation of any

keystroke or combination of keystrokes on the target computer.

In general, to make a key (generate a press of a specific key), a one

byte value between 0x00 and 0x7F is sent to the Com Port of the

USBtoUSB. The key specified will be seen as held down on the target

computer just as if someone was physically holding down that key on

a keyboard.

Each time a make is done for a key, a corresponding break (release) of

that key must be done at a later time to deactivate it. The break code

for a key is the same value as the make code plus 0x80. The break

code releases the key that was activated earlier by a make code. See

the following table for Key Number Mode make and break codes.

613

In the next example, four Com Port mouse packets are sent to

emulate a double left mouse click on the target computer.

Packet 1 - 0x00, 0x00, 0x00, 0x00, 0x00, 0x09 (left mouse

button on). Delay around 150 msec after sending this packet for

the system to see the button.

Packet 2 - 0x00, 0x00, 0x00 0x00, 0x00, 0x08 (left mouse

button off). Delay 150 msec again for the system to see the button

release and create time between the release and activation of the

left mouse button in step 3 below.

Packet 3 - 0x00, 0x00, 0x00, 0x00, 0x00, 0x09 (left mouse

button on). Delay around 150 msec for the system to see the

button.

Packet 4 - 0x00, 0x00, 0x00, 0x00, 0x00, 0x08 (left mouse

button off). No delay required after this release.

Cursor position, scroll wheel movement and button actions may

all be implemented within the same packet. The examples above

focus only on a particular action at a time for clarity. For instance,

a command that sends both X and Y cusor movement can also

send button information and/or scroll wheel movement.

Note that X and Y coordinates require the proper X and Y screen

resolution set by the USBtoUSB.exe to obtain a 1:1 ratio beween

the commanded values and the resulting cursor position.

Sending Serial Control Commands

The CD included with the unit contains source code examples in

various programming languages to help the user get started on

their own Com Port control software. Use these examples as a

reference point for writing programs on the computer attached to

the USBtoUSB Com Port connection.

US Key Number Table (Decimal Values)

An international key number table is available on the CD provided with the USBtoUSB.

Key Make Break

`~ 01 129

1! 02 130

2@ 03 131

3# 04 132

4$ 05 133

5% 06 134

6^ 07 135

7& 08 136

8* 09 137

9( 10 138

0) 11 139

-_ 12 140

=+ 13 141

BS 15 143

Tab 16 144

Q 17 145

W 18 146

E 19 147

R 20 148

T 21 149

Y 22 150

U 23 151

I 24 152

O 25 153

P 26 154

[{ 27 155

]} 28 156

\| 29 157

Caps 30 158

A 31 159

S 32 160

D 33 161

F 34 162

G 35 163

H 36 164

Key Make Break

J 37 165

K 38 166

L 39 167

;: 40 168

‘“ 41 169

Enter 43 171

L Shift 44 172

Z 46 174

X 47 175

C 48 176

V 49 177

B 50 178

N 51 179

M 52 180

,< 53 181

.> 54 182

/? 55 183

R Shift 57 185

L Ctrl 58 186

L Alt 60 188

Space 61 189

R Alt 62 190

R Ctrl 64 192

L Win 70 198

R Win 71 199

Win APL 72 200

Insert 75 203

Delete 76 204

L Arrow 79 207

Home 80 208

End 81 209

Up Arrow 83 211

Dn Arrow 84 212

Page Up 85 213

Page Dn 86 214

Key Make Break

R Arrow 89 217

NumLock 90 218

7 (Num) 91 219

4 (Num) 92 220

1 (Num) 93 221

/ (Num) 95 223

8 (Num) 96 224

5 (Num) 97 225

2 (Num) 98 226

0 (Num) 99 227

* (Num) 100 228

9 (Num) 101 229

6 (Num) 102 230

3 (Num) 103 231

. (Num) 104 232

- (Num) 105 233

+ (Num) 106 234

Enter (Num) 108 236

Esc 110 238

F1 112 240

F2 113 241

F3 114 242

F4 115 243

F5 116 244

F6 117 245

F7 118 246

F8 119 247

F9 120 248

F10 121 249

F11 122 250

F12 123 251

Prt Scr 124 252

Scrl Lk 125 253

Pause/Break 126 254

When sending data to the Com Port on the USBtoUSB to generate

keystrokes at the target computer in Key Number Mode, use the

values shown above to produce the desired “make” and “break”

actions for the corresponding key.

When sending a mouse control packet for cursor movement only,

be sure to send all “0” values for the scroll wheel and mouse

button bits, provided those options are not being used for mouse

actions at that time.

Mouse Packet Examples

The packet below is an example of a packet sent to the USBtoUSB

Com Port to command the cursor to a screen postion of X =

100, Y = 520.

0x00, 0x00, 0x64, 0x02, 0x08, 0x08

Start XMS XLS YMS YLS Scroll

Sending the values shown above will cause the cursor to move to

the screen position 100, 520. The position of the mouse cursor

for the values sent is an absolute screen position and will be

repeatable for a specific computer and screen resolution.

A screen position of 0,0 represents the upper left of the screen.

To send the cursor to specific coordinates on the screen, use the 2

byte values for both X and Y in the packet described above.

The cursor position that results from a command packet will

depend on the particular computer’s display settings. Moving the

cursor to a desired screen position may require working with a few

values to get the exact value for a specific application.

The following packet can be used to send the scroll wheel

command of up one position to the computer.

How far the scroll moves on the computer screen depends on the

scroll system settings of the target computer.

0x00, 0x00, 0x00, 0x00, 0x00, 0x18

By using the make and break commands in Key Number Mode, any

sequence that can by manually entered on a keyboard can be produced

with the USBtoUSB. Use this Key Number Mode to emulate single

keystrokes or combinations such as Ctrl+F1, or Shift+Alt+F5, etc.

Additional Key Number Mode Control Commands

The USBtoUSB features two additional commands for keyboard action.

The first command provides a way to clear the keyboard buffer and is

useful for ensuring that no keys are left in the “ON” state. The second

command allows for the polling of the keyboard status LED states. This

polling command is useful for checking the Shift Lock state, or for making

sure of the Num Lock state before using Num Lock affected keys.

0x38 - USB Buffer Clear Command. Sending the byte 0x38 to the

USBtoUSB Com Port port results in the device’s internal USB keyboard

buffer being cleared. Use of this command ensures that all made keys

currently in the keyboard buffer are released.

0x7F - Status LED Read Command. Sending a code 0x7F to the USBtoUSB

Com Port results in the return of a character in the range of ASCII

“0” - “7”. The USBtoUSB Com Port response character reflects the

current state of the Scroll Lock, Caps Lock, and Num Lock LEDs on the

target computer system as listed in the chart below.

ASCII Response Scroll Lock Status Caps Lock Status Num Lock Status

“0” Off Off Off

“1” Off Off On

“2” Off On Off

“3’ Off On On

“4” On Off Off

“5” On Off On

“6” On On Off

“7” On On On

[W2] - The most significant bit of the scroll wheel movement

magnitude.

[W1] - Bit 1 of the three bit value for scroll wheel movement.

[W0] - Least significant bit of the scroll wheel movement value.

[1] - Bit 3 of the #6 byte is always “1”. Sending “0” for this bit will

cause the entire mouse control packet to be ignored.

[MM] - State of the middle mouse button. Set to 1 for middle

mouse button on, 0 for the button to be off.

[MR] - State of the right mouse button. Set to 1 for right mouse

button on, 0 for the button to be off.

[ML] - State of the left mouse button. Set to 1 for left mouse

button on, 0 for the button to be off.

NOTES - When sending this six byte mouse command packet to

the USBtoUSB Com Port, the five bytes following the first 0x00

byte should be sent with no more than 50msec between each

byte. The starting value 0x00 must always be followed by five

additional bytes to complete the mouse control packet and avoid

any confusion between mouse control and keystroke commands.

The scroll wheel magnitude command is a 4 bit signed value

located in bits Ws through W0, and in the range of 0x00 to 0x07

for up movement, 0x0F to 0x08 for down movement.

The three mouse button bits [MM], [MR], and [ML] command the

states of the mouse buttons as seen by the target computer. A “1”

in the respective bit indicates the mouse button is on, while a “0”

indicates the button is off. Be sure to command the release of any

mouse buttons that were in the on state at a later time once the

mouse button task has completed.

Key Number Mode Examples

Generation of keystrokes on the target computer is done through

the sending of special one byte codes to the USBtoUSB Com Port

when in the Key Number Mode.

Each standard key of the computer keyboard is assigned a “make”

code to emulate the press of a key, and a “break” code, which

results in the release of the key. The Key Number Table on page

7 lists each of the supported keys and their corresponding make

and break codes.

From the keycode table, the value of 2 (0x02) can be sent to the

Com Port on the unit to generate the “make” or press and hold

of the “1” key on the target computer. Sending a byte to the

USBtoUSB Com Port with a value of 130 (0x82) will result in the

release of the “1” key on the target computer.

Important: For any key that has been previously sent a “make”

code, a “break” code of that key must be sent at a later time.

Failure to send the corresponding break code will leave the key

in the down state on the target computer, which may result in

unintended keystrokes when new actions are sent. The last key

left in the make state without a break will generally repeat until

the break code is sent. Never command more than 60 keys in

the “make” state at the same time as this will exceed the standard

USB protocol keyboard buffer length for the USBtoUSB device.

The use of make and break codes allows the user to create virtu-

ally any keystroke combination. For example, if a sequence of

CTRL+ALT+F1 was needed, the following decimal codes would

be sent; 58 (Make L Ctrl), 60 (Make L Alt), 112 (Make F1), 240

(Break F1), 188 (Break L Alt), 186 (Break L Ctrl). Note that the

values shown in the example are the decimal values of a single

byte to be sent for each of the key actions for make and break.

Producing Mouse Action on the Target PC

The USBtoUSB is capable of controlling the mouse cursor and mouse

button states of the target computer through a special six byte command

sequence. This same command sequence sent to the Com Port of the

USBtoUSB can be used in any of the operating modes.

The six byte mouse control sequence is construced as follows:

Byte#1 Byte#2 Byte#3 Byte#4 Byte#5 Byte#6

[Start] [X PosMS] [X PosLS] [Y PosMS] [Y PosLS] [Scroll/Buttons]

Byte #1 - Always a 0x00 value, indicates start of packet.

Byte #2 & #3 - A two byte value which dictates the X axis position

of the mouse cursor on the screen. A value of 0 will send the

cursor to the leftmost screen position. Byte #2 is the Most

Siginificant (MS) byte of the X position value, and Byte #3 is the

Least Significant (LS) part of the X position value.

Byte #4 & #5 - A two byte value which dicatates the Y axis position

of the mouse cursor on the screen. A value of 0 will send the

cursor to the top of the screen. Byte #4 is the MS byte of the Y

position value, and Byte #5 is the LS part of the Y position value.

Byte #6 - Byte for Scroll Wheel movement and mouse button

control. The upper 4 bits of this byte contain a signed value for

scroll wheel movement, while the lower 3 bits command the mouse

Left, Right, and Middle button activation and deactivation.

This Byte #6 is constructed as shown,

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

[Ws] [W2] [W1] [W0] [1] [MM] [MR] [ML]

[Ws] - The sign of the scroll wheel movement. A zero in this bit

commands up movement on the scroll wheel, a one in this bit

produces down scroll wheel movement. Movement magnitude

based on the signed value in Ws through W0 values.

Key Number Mode Examples

Generation of keystrokes on the target computer is done through

the sending of special one byte codes to the USBtoUSB Com Port

when in the Key Number Mode.

Each standard key of the computer keyboard is assigned a “make”

code to emulate the press of a key, and a “break” code, which

results in the release of the key. The Key Number Table on page

7 lists each of the supported keys and their corresponding make

and break codes.

From the keycode table, the value of 2 (0x02) can be sent to the

Com Port on the unit to generate the “make” or press and hold

of the “1” key on the target computer. Sending a byte to the

USBtoUSB Com Port with a value of 130 (0x82) will result in the

release of the “1” key on the target computer.

Important: For any key that has been previously sent a “make”

code, a “break” code of that key must be sent at a later time.

Failure to send the corresponding break code will leave the key

in the down state on the target computer, which may result in

unintended keystrokes when new actions are sent. The last key

left in the make state without a break will generally repeat until

the break code is sent. Never command more than 60 keys in

the “make” state at the same time as this will exceed the standard

USB protocol keyboard buffer length for the USBtoUSB device.

The use of make and break codes allows the user to create virtu-

ally any keystroke combination. For example, if a sequence of

CTRL+ALT+F1 was needed, the following decimal codes would

be sent; 58 (Make L Ctrl), 60 (Make L Alt), 112 (Make F1), 240

(Break F1), 188 (Break L Alt), 186 (Break L Ctrl). Note that the

values shown in the example are the decimal values of a single

byte to be sent for each of the key actions for make and break.

Producing Mouse Action on the Target PC

The USBtoUSB is capable of controlling the mouse cursor and mouse

button states of the target computer through a special six byte command

sequence. This same command sequence sent to the Com Port of the

USBtoUSB can be used in any of the operating modes.

The six byte mouse control sequence is construced as follows:

Byte#1 Byte#2 Byte#3 Byte#4 Byte#5 Byte#6

[Start] [X PosMS] [X PosLS] [Y PosMS] [Y PosLS] [Scroll/Buttons]

Byte #1 - Always a 0x00 value, indicates start of packet.

Byte #2 & #3 - A two byte value which dictates the X axis position

of the mouse cursor on the screen. A value of 0 will send the

cursor to the leftmost screen position. Byte #2 is the Most

Siginificant (MS) byte of the X position value, and Byte #3 is the

Least Significant (LS) part of the X position value.

Byte #4 & #5 - A two byte value which dicatates the Y axis position

of the mouse cursor on the screen. A value of 0 will send the

cursor to the top of the screen. Byte #4 is the MS byte of the Y

position value, and Byte #5 is the LS part of the Y position value.

Byte #6 - Byte for Scroll Wheel movement and mouse button

control. The upper 4 bits of this byte contain a signed value for

scroll wheel movement, while the lower 3 bits command the mouse

Left, Right, and Middle button activation and deactivation.

This Byte #6 is constructed as shown,

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

[Ws] [W2] [W1] [W0] [1] [MM] [MR] [ML]

[Ws] - The sign of the scroll wheel movement. A zero in this bit

commands up movement on the scroll wheel, a one in this bit

produces down scroll wheel movement. Movement magnitude

based on the signed value in Ws through W0 values.