3-6
1n addition to these actions, the user can cause the TCS to send codes to the host by pressing the
touch panel or typing on the keyboard. However, these actions are not referred to as local
commands.
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Remote commands are those sent by the host to the TCS over the serial interface.
Remote commands are used to control the interface between the TCS and the user (for example,
displaying characters on the screen, defining touchkeys, changing character attributes, and
barring the user from the Setup Screen). Remote commands are also used to control the interface
between the TCS and the host (for example, selecting a reporting format for TCS status reports).
NOTE
To make software development easier, remote commands can also be entered from an optional keyboard
by setting the Local/Remote Mode to Local. See “Local/Remote Mode Command,” in Chapter 4.
There are two types of remote commands: control codes and control strings. Control codes are
described at the beginning of this chapter.
A control string is a sequence of codes, beginning with a control code which is usually an
<ESC>, but could be a <CSI> or <DCS>. The sequence causes the TCS to perform a specific
function. For example, the host can reverse the TCS display background by sending the
following control string:
<ESC>[?5h
Control strings are described in more detail later in this chapter.
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Local/remote commands can be sent either remotely by the host, or issued by the user from the
Setup Screen, Test Screen, or Alignment Screen.
An example of a local/remote command is the Cursor Type command, which selects the type of
cursor that is displayed. The Cursor Type command can be sent as a control string from the host.
For example, the string
<ESC>[3v
selects a reverse-video block cursor. The Cursor Type command can also be issued by the user
by entering the Setup Screen and selecting the cursor type.
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