Matrix-orbital LK202-24-USB Manuel d'utilisateur télécharger pdf (Page 12)

LK202-24-USB rev 1

Figure 2-3 General Purpose Outputs

GPO 1, GPO 2, GPO 3

Maximum allowable current is 20mA, which is enforced by a 240ohm current limiting resistor. If the device

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

small jumper wire (wirewrap wire is good) from the feed through hole to the corresponding negative pin for

the GPO in question.

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).

10 - 100 u

1N4001

Relay

coil

GPO

Figure 2-4 Clamping a Relay

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 35 36

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Matrix-orbital LK202-24-USB Manuel d'utilisateur Page 12