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UR7HCDMP

HulaPoint™ - Ergonomic Mouse PS2/RS232 Encoder

Semtech Corporation 

USAR HulaCoderTM UR7HCDMP

Mature

mousecoderTM product

specifications

USAR Systems, Inc.

PS/2 Mode Commands, Cont.

The Status Request

Command (E9h) returns a 3 byte

status report.

The Set Resolution Command

(E8h) controls resolution, and the

Set 2:1 Scaling Command (E7h)

enables a coarse/fine tracking

response. Due to the Advanced

Motion Algorithm, Set Resolution

and Scaling Command are

acknowledged and reported as

activated, but their status is

ignored.The Set 1:1 Scaling

Command (E6h) enables the

values of movements to be

transmitted to the host without any

scaling

Serial Mode

Communication through the serial

port is half-duplex at a fixed speed

of 1200 Baud, 7N2 protocol.

At start-up and after each RTS

toggle the USA HulaCoderTM will

send a two-character ASCII string

“M3” indicating 3-button capability

to the host.

A Data Report is sent if motion is

detected, or if buttons are pressed

or released. Motion is reported

relative to the last Report sent, in a

Two’s Complement Form and eight

(8) bit resolution. In other words,

the Maximum Motion values are -

128 to +127, saturated at min/max

for faster speeds. Byte 4 is sent

only if the middle button is

pressed, held-down, or released.

Serial Data Report Format Table

Byte 1

b0

b1

b2

b3

b4

b5

b6

Byte 2

b0

b1

b2

b3

b4

b5

b6

Byte 3

b0

b1

b2

b3

b4

b5

b6

Byte 4

b0 - 4

b5

b6

X6

X7: MSB of X Data

Y6

Y7: MSB of Y Data

Right Button Status

Left Button Status

Always=1

X0: LSB of X data

X1

X2

X3

X4

X5

Always=0

Y0: LSB of Y data

Y1

Y2

Y3

Y4

Y5

Always=0

Always = 0

Middle Button Status 1=depressed

Always=0

1 = depressed

1 = depressed

USAR Datasheet

DOC7-DMP-DS-102

6

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