Appendix A
58
HA0302T Rev A Feb 2016
A.3.1 Trigger Out (Digital Output)
The digital output (AxisOut) is driven by the non-inverting output of an AM26C31 line
driver, with a 100R resistor between the output of the line driver and the connector
pin. The output voltage levels are compatible with most logic families (approx. 4V for
logic High and 0V for logic Low unloaded).
Fig. A.4 Digital Output Schematic
Please see the APTServer helpfile for details on software calls used to control these
logic IO.
A.3.2 Trigger In (Digital Input)
The digital input (AxisIn) circuit accepts signals in the range 0 to 10 V and has TTL
compatible, Schmidt trigger thresholds. It has a pull up to 5V to allow direct interfacing
without the need for an external pull up resistor and a 16 kHz R-C low pass filter to
reject noise.
Fig. A.5 Digital Input Schematic
AxisOut
AM26C31
100R
Not Connected
5V
10k
10k
1 nF
AxisIn
74HC14