LK204-25-USB-GW Matrix Orbital, LK204-25-USB-GW Datasheet - Page 21

• Manufacturer Part Number: LK204-25-USB-GW
• Description: LCD Character Display Modules White Background Blue Text
• Manufacturer: Matrix Orbital
• Series: LK204-25r

Specifications of LK204-25-USB-GW

• Character Count X Line: 20 x 4
• Module Size (w X H X T): 98 mm x 60 mm x 27.5 mm
• Fluid Type: STN
• Voltage Rating: 5 V
• Operating Temperature Range: 0 C to + 50 C
• Display Mode: Transmissive
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Communication
When communication of either text or commands is interrupted, try the steps below.
*Note:
Manual Override
Should the settings of your display become altered in a way that dramatically impacts usability, the
default settings can be temporarily restored. To override the display, please follow the steps below.
**Note:
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1. Disconnect power from your display.
2. Place a jumper on the middle two pins of the keypad header, R5 and C1.
3. Reconnect power to your unit, and wait for the start screen before removing the override
4. Settings will be
I²C communication will always require pull up resistors on SCL and SDA of one to ten kilohms.
The display module will revert back to the old settings once turned off, unless desired settings are saved.
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.
Next, please ensure that the display module is set to communicate on the protocol that you are
using, by checking the Protocol Select Jumpers.
In serial protocol, 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.
Match Rx from the LVK204-25 to the transmitting pin from your host and the Tx pin to the
receiving pin.
If you are communicating to the display via
correct address. The default slave address for the display module is 80.
In I
Unlock the display. See the Set and Save Data Lock command for more info.
Finally, you may reset the display to its default settings using the Manual Override procedure
outlined below.
jumper.
table. At this point any important settings, such as contrast, backlight, or baud rate, should not
only be set but saved so they remain when the override is removed.
2
C mode, connect Rx to the data line of your controller and Tx to the data output.
temporarily**
Table 16: Manual Override Settings
overridden to the defaults listed in the Manual Override Settings
I
Parameter
Baud Rate
2
Backlight
Contrast
C Address
I²C*
19200
Value
please ensure that the data is being sent to the
255
128
80