Measurement Computing USB-4301 User Manual page 13

USB-4301 User's Guide
Screw terminal – pins 1-28
The screw terminals on the bottom edge of the USB-4301 (pins 1 to 28) provide the following connections:
Two counter input connections (

Two counter gate connections (

Two counter output connections (

Eight digital input connections (

One pull-up/down control connection (

One oscillator output connection (

One interrupt input connection (

Two voltage output power connections (

Two ground connections (

Seven pins are reserved (

Screw terminal – pins 29-56
The screw terminals on the top edge of the USB-4301 (pins 29 to 56) provide the following connections:
Three counter input connections (

Three counter gate connections (

Three counter output connections (

Eight digital output connections (

One pull-up/down control connection (

Two ground connections (

Nine pins are reserved (

Pin 29
USB-4301
Pin 1
Figure 3. USB-4301 screw terminal pin numbering
and )
INP1 INP2
and )
GAT1 GAT2
and
OUT1 OUT2
to )
DI0 DI7
)
DI CTL
)
OSC
)
INT
)
+5V
)
GND
). Do not connect signals to these pins.
RSVD
– )
INP3 INP5
– )
GAT3 GAT5
–
OUT3 OUT5
to )
DO0 DO7
)
DI CTL
)
GND
). Do not connect signals to these pins.
RSVD
13
Pin 56
Pin 28
)
)
Functional Details