3M C3266PW 用户手册
3M™ Multi-Touch Chassis Display User Guide
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3M Touch Systems, Inc. Proprietary Information – TSD-39373 REV E
Mode Stream is the default operating mode for the 3M™ PX serial controller. In Mode
Stream, the controller sends a continuous stream of data packets when the sensor is
touched. The controller sends the data as long as a touch continues on the sensor.
Stream, the controller sends a continuous stream of data packets when the sensor is
touched. The controller sends the data as long as a touch continues on the sensor.
Because Mode Stream sends touch data continually, it is the most versatile mode, and it
provides the best response time and overall feel.
provides the best response time and overall feel.
3M Touch Systems recommends that the touch driver generate an interrupt as each
packet in the data stream arrives. Because touchdown and liftoff events are specially
coded, your software can generate mouse events that correspond to what the user is
doing. This enables instant feedback and prevents data loss.
packet in the data stream arrives. Because touchdown and liftoff events are specially
coded, your software can generate mouse events that correspond to what the user is
doing. This enables instant feedback and prevents data loss.
Communicating with the Controller
This section provides information on sending firmware commands to the controller and
interpreting the responses that the controller returns.
interpreting the responses that the controller returns.
The commands listed in Table 18 are those that 3M Touch Systems currently uses for
development. 3M Touch Systems recommends that you use only these commands for
3M™ PX serial controller development.
development. 3M Touch Systems recommends that you use only these commands for
3M™ PX serial controller development.
Commands to the controller are sent on the signal Receive Data (RXD) line as a serial
data stream. For each command it receives, the controller sends a response to the host on
the signal Transmit Data (TXD) line also as a serial data stream.
data stream. For each command it receives, the controller sends a response to the host on
the signal Transmit Data (TXD) line also as a serial data stream.
Sending Commands to the Controller
When you send a command to the controller, you must use the correct command format.
The general format of a command is as follows:
The general format of a command is as follows:
<Header>Command<Terminator>
Note:
The following descriptions of header, command, and terminator, use 3M Touch
Systems terminal emulator key sequences. You may need to enter the sequence in a
different format, depending on your emulator.
different format, depending on your emulator.
The header is the first character in the command string and is the ASCII start-of-header
control character SOH. The hexadecimal code for the ASCII SOH control character is
01. To start the command sequence, use the key combination Ctrl A (^A). If you are
working with an IBM PC compatible system, the Ctrl A key combination immediately
returns an ASCII ☺ character.
control character SOH. The hexadecimal code for the ASCII SOH control character is
01. To start the command sequence, use the key combination Ctrl A (^A). If you are
working with an IBM PC compatible system, the Ctrl A key combination immediately
returns an ASCII ☺ character.
The command, which always follows the header, consists of ASCII uppercase letters and
numbers only (printable characters).
numbers only (printable characters).
The terminator is the last character of each command string and is an ASCII carriage
return CR. An ASCII CR control character is 0D hexadecimal. To enter a carriage return,
ending the command sequence, use Enter or the key combination Ctrl M (^M).
return CR. An ASCII CR control character is 0D hexadecimal. To enter a carriage return,
ending the command sequence, use Enter or the key combination Ctrl M (^M).