USB-AD16f
Page 3
3
Digital inputs and outputs
The USB-AD16f features 4 digital inputs and outputs each (
low
:
0V..0.7V;
high
: 3V..5V) and an isolated counter input. The 5V
auxiliary voltage at pin 6 can be used e.g. for sensor supply.
All connections are led to the 15-pin D-Sub female connector on
the back of the device. The pin assignment is as follows:
Pin
USB-AD16f
Pin
USB-AD16f
1 DOut
1
5, 13
DGND
9 DOut
2
6 V
USB
(4-5V; max. 20mA)
2 DOut
3
7
counter input low
10 DOut
4
14 counter
input
high
3 DIn
1
8, 15
n. c.
11 DIn
2
4 DIn
3
12 DIn
4
•
The digital lines are protected by 1k
Ω
resistors. If the input voltage is not within the permitted
voltage range of 0V..5V, the device may be damaged.
•
The digital inputs and outputs are not galvanically isolated except for the counter.
•
The digital ground (DGND) is connected with the PC ground.
4
Interfacing examples for the digital lines of the USB-AD16f
The following basic connection examples demonstrate the use of the digital inputs and outputs and the
connection of a counter to the USB-AD16f. The pin assignment of the 15-pin D-Sub female connector is
described in chapter 3.
4.1
Interfacing examples for the
counter input
The galvanically isolated 16-bit counter is
connected at pin 7 and 14.
At maximum performance (2
16
-1), the
counter is reset and starts from zero again.
