Queclink GL200 User Manual download pdf (Page 11)

GL200 User Manual

TRACGL200UM001 - 10 -

Example of OUT pin drive a LED

Example of OUT pin drive a relay

If the digital output is used to drive a relay, a catch diode is showed across the relay coil, this is

necessary to prevent damage to the digital output when the relay is turned off. Many modern relays

come with this diode pre-installed internal to the relay itself. If the relay has this diode, insure the

proper relay polarity connected is used. If this diode is not internal, it should be added externally. A

common diode such as a 1N4004 will work in most circumstances.

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Queclink GL200 User Manual Page 11