NI 653X Device Physical Channels
Digital Input and Output
All NI 653X devices have 32 individually configurable lines of digital input and output that are grouped into four 8-bit ports.
Port | NI-DAQmx Physical Channel Name (Lines) | NI-DAQmx Physical Channel Name (Ports)1 |
---|---|---|
Port 0 | Dev1/port0/line0 — Dev1/port0/line7 | Dev1/port0 |
Port 1 | Dev1/port1/line0 — Dev1/port1/line7 | Dev1/port1 |
Port 2 | Dev1/port2/line0 — Dev1/port2/line7 | Dev1/port2 |
Port 3 | Dev1/port3/line0 — Dev1/port3/line7 | Dev1/port3 |
1This physical channel name refers to all eight lines in a port at once. |
For Ports 0 through 3, you can configure a port width of eight, 16, or 32 bits. To configure a 32-bit port, use the physical channel name Dev1/port0_32. To configure a 16-bit port, use channel names that refer to all the lines in multiple consecutive ports: Dev1/portP_N, where P is the port number of the lowest numbered port, and N is the total number of lines. For instance, combining Port 2 and 3 into a 16-bit port, you would specify Dev1/port2_16 as the physical channel.
NI 653X devices also have eight fixed-direction lines, grouped into two ports, that use PFI lines. Port 4 is used for input operations; Port 5 is for output.
Port 4 and port 5 can be used as static digital I/O lines or PFI lines. When any of these PFI lines is used as a digital I/O signal, it uses the physical channel name shown in the following table.
PFI Signal | Physical Channel Name |
---|---|
PFI0 | Dev1/port4/line0 |
PFI1 | Dev1/port4/line1 |
PFI2 | Dev1/port4/line2 |
PFI3 | Dev1/port4/line3 |
PFI4 | Dev1/port5/line2 |
PFI5 | Dev1/port5/line3 |
PFI6 | Dev1/port5/line0 |
PFI7 | Dev1/port5/line1 |