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USB-1616HS-2 User's Guide Functional Details
34
Each signal (A, B) can be connected as a single-ended connection with respect to the common digital ground
(GND). Both encoders need power from an external power source (typically +5 VDC).
Connect each encoder's power input to the external power source. Connect the return to digital common (GND)
on the same source.
Figure 22. Connections from two encoders to screw terminals on the USB-1616HS-2
Timer outputs
Two 16-bit timer outputs are built into every USB-1616HS-2. Each timer output can generate a different square
wave with a programmable frequency in the range of 16 Hz to 1 MHz.
Figure 23. Typical USB-1616HS-2 timer channel
Example: Timer outputs
Timer outputs are programmable square waves. The period of the square wave can be as short as 1 µs or as long
as 65535 µs. Refer to the table below for examples of timer output frequencies.
Timer output frequency examples
Divisor Timer output frequency
1 1 MHz
100 10 kHz
1000 1 kHz
10000 100 Hz
65535
15.259 Hz (in asynchronous write)
Turns timer off (for setpoint operation).
The two timer outputs can generate different square waves. The timer outputs can be updated asynchronously at
any time.
1
The ground depicted at the left is associated with Digital Common on the USB-1616HS-4.
2
The ground depicted at the right is associated with the external power source.
Ground (to Digital Common
1
)
Counter 0 (CNT0) – To Encoder #1 “A”
Counter 1 (CNT1) – To Encoder #1 “B”
Counter 2 (CNT2) – To Encoder #2 “A”
To external power
To
g
round
2
Counter 3 (CNT3) – To Encoder #2 “B”