User guide

9.2 Issuing Commands
Commands are issued to the display by the micro-controller. In a test setup, commands can be issued
to the display by means of a BASIC program, using the chr$( ) function. In the tables below, we’ve shown
commands in hex, ASCII and decimal form. All commands begin with the prefix character 0xFE (254
decimal). These commands are issued on the serial communications link (I
2
C or RS-232) at the currently
defined baud rate.
For example (using BASIC in a test setup), the user could issue the command to clear the screen on the
display by including the line:
in the BASIC program.
Or, with C the user could (using Zcomm serial library)
9.3 Text Commands
Table 9: Text Commands
Command Syntax Default Notes
Auto scroll on E 51
254 81
254 ’Q’
off Enables scroll at
bottom of screen.
Text will push
display up one
line to make room
for new line.
Auto scroll off FE 52
254 82
254 ’R’
off Disables auto
scroll. Text will
wrap to top left
and overwrite
existing text.
Set text insertion point FE 47 [col] [row] 254 71
[col] [row] 254 ’G’ [col]
[row]
n/a Sets text insertion
point using the
base size of the
current font
Matrix Orbital GLK12232-25-SM 30