USER'S MANUAL, VERSION 2.0
Copyright © Convergence Systems Limited 2021, All Rights Reserved
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6.2
General Purpose Output (GPO)
Maximum current that can pass through the GPO optically isolated switches of CSL Intelligent
Fixed Readers is 2 Ampere.
Therefore a protection resistor with very high power rating must be added in series to the
external circuit to limit the current to 2 Ampere. The value of this resistor should be such that
the current cannot exceed 2 A.
Resistor Value = External Voltage / 2 A.
In addition, there is actually a resettable fuse internal to the GPO circuit in series with the
circuit that will protect the switch as a last-ditch defense.
