Specifications

Chapter 3 - General Programming Issues CARROLL TOUCH
3-2 Touch System Programmer’s Guide
Hardware Configurations
There are two major types of Carroll Touch controller configurations:
built-in controllers (used in infrared Smart-Frames) and external
controllers (used in modular infrared and guided wave touch systems).
Built-In Controllers
An infrared Smart-Frame touch system has controller electronics
built onto the touch frame itself. The Smart-Frame touch system
communicates directly with the host computer through the host serial
port. Figure 3-1 illustrates the built-in Smart-Frame controller hardware.
Figure 3-1. Built-In Smart-Frame Controller Hardware
The Smart-Frame communicates serially with the host computer using a
selectable baud rate (300, 600, 1200, 2400, 4800, 9600, 19,200 or
autobaud) and parity (odd, even, none, autoparity). Default values for
the standard Smart-Frame are autobaud and autoparity.
External Controllers
External controllers connect to the touch system via the Modular Digital
Interface (MDI) cable in modular infrared touch systems or an 8-pin
mini-DIN sensor cable in guided wave systems. The MDI cable carries
digital signals, while the mini-DIN sensor cable carries analog signals.
A modular infrared touch system consists of any one of a number of
IR-transparent protective bezels that house and protect a touch frame,
matched with any one of three modular touch controllers: the software-
RS-232 Cable
Built-in
Host PC
Controller
(Infrared
Smart-
Frame)