Carrol Touch Modular Flat Panel Specifications download pdf (Page 49)

Chapter 4 - Smart-Frame Protocol CARROLL TOUCH

4-8 Touch System Programmer’s Guide

HBC Hardware Reset Register

For touch systems that use the modular HBC, writing any value to the

HBC Hardware Reset Register (Base Address +2) resets the touch

system. This type of reset is equivalent to cycling the power to the touch

system.

Break (Firmware Detected)

For all touch systems that communicate serially, a break of at least

150ms resets the touch system. To send a break of 150ms, set the

Transmit Data (TD) signal to the “space” condition (positive voltage),

wait 150ms, and set the TD signal back to the “mark” condition

(negative voltage). For PC systems, the “Set Break” bit in the Line

Control Register of the 8250 USART chip is used to set and/or clear the

break condition. This type of reset is equivalent to cycling the power to

the touch system, except that Clear To Send (CTS) is not affected if

hardware flow control was not enabled before the reset.

Reset (45H)

This Smart-Frame Protocol command resets everything. If the touch

system communicates serially and hardware flow control is enabled,

CTS is deasserted (negative voltage) to indicate that the touch system

is busy until the touch system is ready to accept commands. For serial

touch systems that have their communication parameters set to

autobaud/autoparity, this occurs when the touch system enters the

autobaud/autoparity sequence by sending breaks. If hardware flow

control is disabled, Clear To Send (CTS) is not affected. This type of

reset is equivalent to cycling the power to the touch system, except that

the Clear To Send (CTS) is not affected if hardware flow control was

not enabled before the reset. Also, if the touch system communicates

serially but is set to use a fixed baud rate and parity (not

autobaud/autoparity), or if the touch system uses the HBC, the touch

system sends a Power Up Report (F1 FF) when it is ready to receive

commands.

In all cases, the touch system is ready to receive commands within one

second after the reset occurs. Touch applications must delay for one

second after resetting the touch system. In cases where a break is sent,

the one second time does not begin until the break is released.

Performing the Autobaud/Autoparity

Sequence

If you are using a touch system that communicates serially and is set to

use autobaud/autoparity, you must perform the autobaud/autoparity

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Carrol Touch Modular Flat Panel Specifications Page 49