Matrix-orbital PK162-12 Manual do Utilizador descarregar pdf (Página 16)

mands. The + terminal is connected directly to the module positive supply, the - terminal is connected

through a 240ohm current limiting resistor and the electronic switch to ground.

Figure 16: General Purpose Outputs

Maximum allowable current is 20mA, which is enforced by the current limiting resistor. If the device

being switched has a resistance of 240ohms or more the corresponding resistor may be shorted.

NOTE The GPOs do not have any over current or over / under voltage protection so

care must be taken when using them. For instance if the external device is a relay it must

be fully clamped using a diode and capacitor to absorb any generated back electro-motive

force (EMF).

Figure 17: Clamping a Relay

3 Displaying Text

This chapter describes the various text display commands in detail. Before issuing commands to the

PK162-12 please read sections 7.2 and 7.3.

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