Relay changeover contacts (digital outputs) – Extron Electronics MS9500 HD FrEND Plus User Manual
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MS9500GL HD FrEND Plus User Guide
Chapter 13: Using the GPIO Interface
Option 1 – Input switch contacts using the MS9500GL’s power supply. This method is useful in applications
where the current required is within the allowable limit of the MS9500GL. 500mA is available for external use.
Option 2 – Input switch contacts using an external power supply. The voltage of the external supply is not critical
if the current through the internal 560ohm resistor is limited between 5 – 20mA. This method is preferred where
installation takes place in noisy environments, or where the switch contacts wiring is run over a long distance.
Relay Changeover contacts (Digital Outputs)
GPIO output offers four (4) normally open/normally closed (NO/NC) sets of relay changeover contacts.
These relay outputs are used as switches to control external devices. Their activity is controlled by the GPIO
control sequence (macro) stored on the MS9500GL.
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