Matrix-orbital VFD2041 User Manual download pdf (Page 19)

2.4 General Purpose Outputs

A unique feature of the VFD2041 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 19: 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 VFD2041 to be reset to factory defaults. This can be

particularly helpful if the display module has been set to an unknown baud rate or I

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.

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.

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Matrix-orbital VFD2041 User Manual Page 19