GRAPHTEC MP303-04 - Using Debug Mode for Error Location; Debug Mode Activation and Purpose

5-5
■ Debug Mode
This mode is used to locate programming errors in your application program.
When the plotter is in Debug Mode, its buffer size is reduced to permit easier detection of the section of the
program that is causing the plotting error.
■ Procedure
(1) Mount a pen in the pen station's Pen 1 position.
(2) Place a sheet of paper on the writing panel.
(3) Hold down the
ENTER
key while you turn on the plotter.
The plotter is initialized.
Debug
Mode
(4) Secure the paper.
The prompt below is displayed for a few seconds to prompt you to press the
CHART HOLD
key.
Set
Paper!
The prompt below is displayed
ReadyReady
(5) The plotter is now in Debug Mode.
(6) Run the target program at the computer for output to the plotter.
The message DEBUG MODE is displayed for a few seconds.
In this mode, the plotter's buffer memory is reduced to the following sizes:
• In RS-232C mode : 256 bytes
• In Centronics mode : 10 bytes
To exit Debug Mode, turn off the plotter and then turn it back on using only the POWER switch.
HINT
When using the RS-232C interface, the timing of data transmission varies with the selected handshake
mode as follows.
• During hardwire handshaking:
The ER (DTR) signal line goes goes off when the available space in the buffer drops to 64 bytes.
It goes on when the available space in the buffer rises to 128 bytes of data.
• During Xon/Xoff handshaking:
Xoff status is entered when the available space in the buffer drops to 32 bytes.
Xon status is entered when the available space in the buffer rises to 128 bytes of data.
NOTE
After the plotter is turned off, Debug mode is not resumed when only the
ENTER
key is pressed.