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USB (QL355P & QL564P only)
The USB port is connected to instrument ground. It accepts a standard USB cable. The
Windows plug-and-play functions should automatically recognise that the instrument has been
connected.
Alarm Outputs
The recessed 2-pin connector marked Alarm provides access to an opto-isolated NPN switching
transistor, the function of which can be set from the keyboard, see the Alarms section of this
manual.
The maximum operating voltage that can be applied across the terminals is 20VDC and the
maximum sink current for the switch 'closure' is 1mA.
Do not apply external voltages between the terminals exceeding 30VDC.
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