26

EX II 3000SP Controller Reference Guide

Table 5 describes the meaning of the bits in the status byte (Byte 1).

Table 5 Calibrate Raw Status Bits

Bit

Description

Values

S0 – S5

Reserved

—

S6

Proximity

1 = Touch screen is being touched (a touchdown

 

(touch state)

or a continued touch).

 

 

0 = Touch screen is not being touched (a touch

 

 

liftoff or inactive).

 

 

When the proximity bit changes from 1 to 0 (touch

 

 

liftoff), the controller outputs one final set of X/Y

 

 

coordinate data with the bit equal to 0 and the X/Y

 

 

coordinate data equal to the last touch point.

S7

Packet

Always 1.

 

synchronization

 

Finger Only

Syntax: <SOH>FO<CR>

Description: The controller is set to only respond to finger touches and disable the TouchPen.

Response: <SOH>0<CR> Positive response

Format Raw

Syntax:

<SOH>FR<CR>

Description:

Returns the signal level (amount of touch) of each of the four touch screen

 

corners in digital format. The returned values are not corrected for stray

 

values.

 

The Format Raw data is a 41-byte packet that includes 1 status byte and 40

 

bytes of binary corner data. The first byte of each packet always has its high

 

bit (Bit 7) set to provide synchronization with the host system. Refer to

 

Table 6 for General Packet Formats. Each corner data is composed of a pair

 

of 32-bit I and Q values, which are delivered in 10 bytes.

 

I and Q are complex touch currents as measured in phase and 90 degrees out

 

of phase with the corner drive signal. Refer to Table 7 for I/Q Corner

 

Components.

3M Touch Systems Proprietary Information