Connections and Wiring
20
NI-700 & NI-900 Hardware Reference Guide
Input/Output (I/O) Port: Connections and Wiring
The I/O port responds to either switch closures, voltage level (high/low) changes, or it can be used for
logic-level outputs. You can connect up to four devices to the NI-700 or NI-900 (FIG. 7).
A contact closure between the GND and an I/O port is detected as a Push.
When used for voltage inputs, the I/O port detects a low signal (0 - 1.5 VDC) as a Push, and a
high signal (3.5 - 5 VDC) as a Release (this IO port uses 5V logic but can handle up to 12V
without harm).
When used for outputs, the I/O port acts as a switch to GND and is rated for 200 mA @
12 VDC. This device can use up to 4 I/O ports (see table below).
The PWR pin provides +12 VDC @ 200 mA and is designed as a power output for the PCS
Power Current Sensors, VSS2 Video Sync Sensors (or equivalent).
The GND connector is a common ground and is shared by all I/O ports. A common ground is
shared with I/O ports 1 - 4 (see table below).
FIG. 7 INPUT/OUTPUT connector (male)
I/O Port Wiring Specifications
Pin Signal Function
1 GND Signal GND
2 I/O 1 Input/Output
3 I/O 2 Input/Output
4 I/O 3 Input/Output
5 I/O 4 Input/Output
612 VDC PWR
Port 4 on the NI-700
Port 5 on the NI-900
To Next Page
Loading...
