Table 2: Default Values
Contrast
128
Backlight
255
Baud Rate
19.2 kbps
I2C Slave Address
0x50
Data Lock
False
RS232AutoTransmitData
True
NOTE
The display module will revert back to the old settings once turned off, unless the
settings are saved.
3 Troubleshooting
3.1 The display does not turn on when power is applied.
?
First, you will want to make sure that you are using the correct power connector. Standard ?oppy drive
power cables from your PC power supply may ?t on the Power/Dat
a Connector however they do not
have the correct pin out as can be seen in
?gure 10 on page 5
. Matrix Orbital supplies power cable
adapters for connecting to a PC, which can be found in the
Accessories Section on page 2.
?
The next step is to check the power cable which you are using for continuity. If you don't have an
ohm meter, try using a different power cable, if this does not
help try using a different power supply.
?
The last step will be to check the
Power / Data Connector
on the LCD2041. If the
Power / Data
Connector
has become loose, or you are unable to resolve the issue, please contact Matrix Orbital,
see
12.6 on page 51
for contact information.
3.2 The display module is not communicating.
?
First, check the communication cable for continuity. If you
don't have an ohm meter, try using a
different communication cable. If you are using a PC try using a different Com Port.
?
Second, please ensure that the display module is set to communicate on the protocol that you are
using, by checking the
Protocol Select Jumpers.
To change the protocol used by the display module
see
Section 2.3 on page 11.
?
Third, ensure that the host system and display module are both communicating on the same baud rate.
The default baud rate for the display module is 19200 bps.2
C please ensure that the data is being sent to the correct
?
If you are communicating to the display via I
address. The default slave address for the display module is
0x50.
NOTE
I2C communication will always require pull up resistors.
?
Finally, you may reset the display to it's default settings using the
Manual Override Jumper, see
Section 2.5 on page 13.
Matrix Orbital LCD2041
15