Matrix Orbital GLK12232-25-SM - Manual (Page 15)

relatively high current (such as a relay) and has an internal resistance of its own greater than 250 ohms, then
the 240 ohm resistor may be removed and replaced with a jumper.
Pin 1 (from left) - GND
Pin 2 GPO 1 + MAX: 20mA, +5Vdc
Pin 3 - GND
Pin 4 GPO 2 + MAX: 20mA, +5Vdc
Figure 14: General Purpose Output
WARNING 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 GLK12232-25-SM to be temporarily reset to some of the
factory defaults. This can be particularly helpful if the display module has been set to an unknown baud rate
or I
2 C 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 1 and 2 as pictured below.
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 GLK12232-25-SM 10