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8. Local Keypad & LCD Display
1. Address key: The 'ADDR' command is activated along with the 'always listen' address value (address '10'). A 5 seconds
countdown starts, during which 1 or 2 numeric key entries are expected. Each numeric key entry is followed by a 260 ms hold off
and restarts the countdown, but now for 2 seconds. If the initial time window elapses without a numeric key entry, or if an invalid
address (e.g. >16) is entered, the local control panel address is reset to the 'always listen' value.
2. Other keys: The corresponding command is activated along with the address last entered. The command bits are related to the
matrix coordinates as follows:
Matrix
e.g. 'PAUSE' button pressed
After activating, the keyboard is scanned once more to detect if a key is still pressed. This keeps the repetition rate controllable at
exactly 130ms, because the reset timing is offside now.
This unit was designed for the ELM series which has a character 24x2 character LCD display.
The functionality of all previous local controls are combined in this unit, therefore the unit can be used in all non-CRT projectors.
The display can be controlled by the CPU-board through an I²C I/O expander (I20) and a latch (I21). I²C adresss of the I/O expander
is 0x7F. The display needs an 8 bit databus, a clock signal and a register select (selects if incoming data is command or data). The
output of the I/O expander provides the clock and register select and the upper nibble of the databus (D4..D7), the latch control and
a control signal for the backlight of the display. The latch is used to create an 8-bit databus.
The contrast voltage of the display must be independent of the supply voltage, hence a voltage reference (Z101) is needed.
8.4 Status Conditions & Fault Analysis
8.4.1
Error List on LCD and INFO display
Error List
The first column of this table represents the two characters displayed on the information display and the second column the fault
description displayed in the LCD display.
ERROR(-101)
I
C ERROR(SDA)
2
Image 8-6
Display fault analysis
Info Display
LCD Display
- C
ERROR(-101)
I
2
- d
ERROR(-102)
I
2
- L
ERROR(-1000)
WRONG LAMP PARAMETER(S)
- L
ERROR(-1001)
WRONG LAMP PARAMETER(S)
46
command = (<row> x 8 ) + <column>
command = ( 1 x 8 ) + 7 = 15
C ERROR(SCL)
C ERROR(SDA)
Error Description
The I
2
C SCL line doesn't react (held down), so no I
is possible.
The I
2
C SDA line doesn't react (held down), so no I
is possible.
2
No I
C communication with the lamp module EEPROM or Lamp
parameter "article number" unknown or corrupt.
Lamp parameter "maximum current" corrupt or not within range.
R5976820 SLM R12+ PERFORMER 08/03/2005
C
2
C communication
2
C communication
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