2.4 General Purpose Outputs
A unique feature of the LCD2041 is the ability to control relays and other external devices using a
General Purpose Output, which can provide up to 20 mA of current and +5Vdc from the positive side of the
GPO. If the device, which is being driven by a GPO, requires a relatively high current (such as a relay) and
has an internal resistance of its own greater than 250 ohms, then the 240 ohm resistor, which is associated
with the GPO may be removed and replaced with a Jumper.
-
+
GND
MAX: 20 mA, +5Vdc
Figure 18: General Purpose Output
WARNING
If connecting a relay, be sure that it is fully clamped using
a diode and capacitor in order to absorb any electro-motive force (EMF)
which will be generated.
2.5 Manual Override
The
Manual Override
is provided to allow the LCD2041 to be reset to factory defaults. This can be
particularly helpful if the display module has been set to an
unknown baud rate or I2C Slave Address and
you are no longer able to communicate with it. If you wish to return the module to its default settings you
must:
1. Power off the display module.
2. Place a Jumper on the
Manual Override
pins.
3. Power up the display module.
4. The display module is now set to its default values listed below in
table 2.
5. Edit and save settings.
Matrix Orbital LCD2041
13
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相关PDF资料
LCM-480234GF-40CG
LCD TFT 4.0" MODULE W/NTSC DEC
LCM-960234GF-64FC
LCD TFT 6.4" MODULE W/NTSC DEC
LCM-H12864GSF/H-Y
LCD MOD GRAPHIC 128X64 W/LED
LCM-H24064GSF
LCD GRAPHIC 240X64 TRANSFL FSTN
LCM-S00802DSF
LCD MODULE 8X2 CHAR TRNSFL STN
LCM-S00802DSR
LCD MODULE 8X2 CHAR REFL STN
LCM-S00802DTF
LCD MODULE 8X2 CHAR TRNSFL TN
LCM-S00802DTR
LCD MODULE 8X2 CHAR REFLECT TN
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