Matrix-orbital GLC24064 Manual do Utilizador descarregar pdf (Página 13)

The display will now be in I

C mode and have a default slave address of 0x50 unless it has been changed.

Similarly, in order to change the display to TTL mode, simply remove the zero ohm resistors from the 232

or I

C jumpers and solder them to the TTL jumpers.

Figure 15: Protocol Select Jumpers

2.4 General Purpose Output

A unique feature of the GLC24064 is the ability to control relays and other external devices using a

General Purpose Output (3), which can provide up to 20 mA of current and +5Vdc from the positive side of

the GPO. This is limited by a 240 ohm resistor which is located directly above the positive pin as pictured

below in ﬁgure 16. 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 may be

removed and replaced with a Jumper.

Pin 1 - GND

Pin 2 + MAX: 20 mA, +5Vdc

Figure 16: 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.

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