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参数资料
| 型号： | VK204-25-USB-E |
| 厂商： | Matrix Orbital |
| 文件页数： | 14/47页 |
| 文件大小： | 2507K |
| 描述： | VF CHARACTER DISPLAY 20X4 USB |
| 产品变化通告： | 12C Displays Change 11/Oct/2011 |
| 标准包装： | 1 |
| 系列： | VK204-25 |
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21
Communication
When communication of either text or commands is interrupted, try the steps below.
?
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 I2C*
please ensure that the data is being sent to the
correct address. The default slave address for the display module is 80.
?
In I2C mode, connect Rx to the data line of your controller and Tx to the data output.
?
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.
*Note:
I2C communication will always require pull up resistors
on SCL and SDA of one to ten kilohms.
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.
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
jumper.
4.
Settings will be temporarily**
overridden to the defaults listed in the Manual Override Settings
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.
Parameter
Value
Backlight
255
Contrast
128
Baud Rate
19200
I2C Address
80
Table 19: Manual Override Settings
**Note:
The display module will revert back to the old settings once turned off, unless desired settings are saved.
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