Dynapro Technologies Dynapro ET TCS, Application Developer'S Manual

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6-5
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The touch panel is divided into 12 rows and 10 columns of individual touch cells, one or more of
which can form a single touchkey. (See Figure 6-1.) Each touchkey has a unique numeric value
determined by the master cell in its upper left corner, which the TCS reports to the host. The
TCS can send touch reports either spontaneously (whenever a touchkey is touched) or only when
the TCS is polled for a response (using the Polled Touch Mode).
Normally, the TCS spontaneously sends a touch report to the host whenever a touchkey is
touched. However, when the host is busy or has particularly slow input/output service, it may be
advantageous to operate the touch panel in the Polled Touch Mode. In the Polled Touch Mode,
the TCS sends the host a touch report only when the host requests (polls) the TCS to do so. This
lessens the burden on the host and minimizes the possibility of data overruns and lost characters.
The Polled Touch Mode is fully documented later in this chapter.
In either case, the TCS sends each touch report in the following format:
<ESC>[>2;<Pk>n
<Pk> is a three-digit, zero-filled ASCII numeric string (000 through 120, inclusive) that
represents the number of the touchkey.
For example, if the user activates touchkey number 81, the following report is sent to the host:
<ESC>[>2;081n
NOTE
The TCS supports several touch reporting controls and formats. The host can select the touch report
introducers or terminator by using the Reporting Format command described in Chapter 4. The host can
get more information about a touchkey by using the Extended Report Mode command, described later in
this chapter.