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3.2.2 I/O Connector Signal Description
Table 3.1: I/O Connector Signal Description
Signal
PA<0~7,
10~17>
PB<0~7,
10~17>
PC<0~7,
10~17>
+5V_OUT
C<1,2>_Out
C<1,2>_Gate
C<1,2>_In
INT_Out
GND
3.2.3 LED Indicator Status Description
The USB Module is equipped with a LED indicator to show the current
status of the device. When you plug the USB device into the USB port,
the LED indicator will blink five times and then stay lit to indicate that it
is on. Please refer to the following table for detailed LED indicator status
information.
Table 3.2: LED Indicator Status Description
LED Status
On
Off
Slow Blinking (5 times)
Fast Blinking
(Depends on data transfer speed).
USB-4751/4751L User Manual
Ref.
Direction
GND Input/Out-
put
GND Input/Out-
put
GND Input/Out-
put
GND Output
GND Output
GND Input
GND Input
GND Output
-
-
Description
Digital input/ output port A, channel
0~7 & channel 10~17.
Digital input/ output port B, channel
0~7 & channel 10~17.
Digital input/ output port C, channel
0~7 & channel 10~17.
+5V DC power
Output pins of counter/ timer 1 and 2
Gate control pins of counter/ timer 1
and 2
External clock source of counter/ timer
1 and 2
Interrupt output. This pin changes to
logic 1 whenever the
USB-4751 generates an interrupt, and
returns to logic 0 when the interrupt is
cleared.
Digital ground
Description
Device ready for work
Device not ready to work
Device initialization
Device working
14
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