ITech IT6600C Series User Manual page 166

When pins 1 to 7 are configured for the Output function, they can output a
high level (False) or low level (True).

PWM Output
Only pins IO-1 and IO-2 can be configured for PWM function, allowing these
pins to output PWM signals to external devices. When configured for PWM
function, it is necessary to set the values of frequency (Freq) and duty cycle
(Duty).
Digital IO-1
IO-1 pin can be set to [PS Clear], [Input], [Output], [PWM]
The default function is to clear the protected state. When the protection occurs,
the protection state can be cleared through this pin, so that the instrument can
continue to output normally.
Digital IO-2
IO-2 pin can be set to [PS], [Input], [Output], [PWM]
The default function is protection state indicator. IO-2 pin will output high or low
level based on whether the instrument is under protection or not. Under normal
conditions (Not under protection), and when pin 2 is under default setting (Not
Invert), pin 2 outputs high level; when the instrument is under protection, pin 2
outputs low level. When pin 2 is set to Invert, the output level is completely
opposite.
Digital IO-3
IO-3 can be set to [OnOff Status], [Input], [Output]
The default function is to indicate the output state of the power supply, in case
of output is On, output 5V, otherwise, output 0V.
When pin 3 is set to Invert, the output level is completely opposite.
Digital IO-4
IO-4 can be set to[Trigger-in], [Trigger-out], [Input],[Output]

[Trigger-in]: The input trigger signal, the pulse signal sent to the IO-4 pin can
be used as the trigger source.
Configure the trigger source of the Oscilloscope function, Data recording,
and List function to be external. When the instrument receives an external
pulse signal, it will trigger the running of the Oscilloscope function, Data
Recording function or List function.

[Trigger-out]: Configure IO-4 as Trigger Out and enable the triggering output
(Trig out) of the List. When the List is triggered to run, IO-4 will output a
pulse signal.
Digital IO-5
IO-5 pin can be set to [Inhibit-latch], [Inhibit-living], [Input], [Output]
The default function is inhibit output. When the IO pin is configured for a Inhibit
function and the level signal is low, the output of the machine is forbidden.
Inhibit function has two mode: Latch and Living.

Living: When input an inhibit signal and the instrument output is turned OFF.
The status bar of the LCD screen displays INH warning icon and the output
is marked as OFF. If power supply output is ON state before, the ON/OFF
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System-Related Functions
157