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参数资料
| 型号： | VK204-25-USB-E |
| 厂商： | Matrix Orbital |
| 文件页数： | 29/47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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35
8.
Data Security
8.1.
Set Remember
Dec
Hex
254 147
FE 93
Switch
Switch
Allows changes to specific settings to be saved to the display memory. Writing to non-volatile memory can be slow
and each change consumes 1 write of approximately 100,000 available. The Command Summary
outlines which
commands are saved always, never, and when this command is on only. Remember is off by default.
Switch
1 byte, 1 for on or 0 for off
8.2.
Set Data Lock
Dec
Hex
254 202 245 160
FE CA F5 A0
Level
Level
Temporarily locks certain aspects of the display to ensure no inadvertent changes are made. The lock is released
after a power cycle. A new level overrides the old, and levels can be combined. Default is 0.
Level
1 byte, each bit representing a level, see Table 28
Table 28: Data Lock Bits
Display
Command
Reserved
Setting
Address
Reserved
Reserved
Reserved
7
6
5
4
3
2
1
0
Table 29: Lock Parameters
Reserved
Place holders only, should be 0
Address
Locks the Baud Rate and I2C address
Setting
Locks all settings from being saved
Command
Locks all commands, text can still be written
Display
Locks entire display, no new text can be displayed
8.3.
Set and Save
Data Lock
Dec
Hex
254 203 245 160
FE CB F5 A0
Level
Level
Locks certain
aspects of the display to ensure no inadvertent changes are made. The lock is not affected by a
power cycle. A new level overrides the old, and levels can be combined. Default is 0.
Level
1 byte, see data lock table
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