Table Of Contents
USB-6221 BNC Pinout
| Counter/Timer Signal | Default PFI Terminal |
|---|---|
| CTR 0 SRC | PFI 8 |
| CTR 0 GATE | PFI 9 |
| CTR 0 AUX | PFI 10 |
| CTR 0 OUT | PFI 12 |
| CTR 0 A | PFI 8 |
| CTR 0 Z | PFI 9 |
| CTR 0 B | PFI 10 |
| CTR 1 SRC | PFI 3 |
| CTR 1 GATE | PFI 4 |
| CTR 1 AUX | PFI 11 |
| CTR 1 OUT | PFI 13 |
| CTR 1 A | PFI 3 |
| CTR 1 Z | PFI 4 |
| CTR 1 B | PFI 11 |
| FREQ OUT | PFI 14 |
| Signal | Reference | Description |
|---|---|---|
| AI GND |
— | Analog Input Ground—These terminals are the reference point for single-ended AI measurements in RSE mode and the bias current return point for DIFF measurements. All ground references—AI GND, AO GND, and D GND—are connected on the device. |
| AI <0..7> |
Varies |
Analog Input Channels—For differential measurements, the BNC pin and shield are the positive and negative inputs of the differential analog input channel. Refer to the M Series User Manual for information about the FS/GS switch selection and single-ended measurement options. |
| AI SENSE |
— | Analog Input Sense—In NRSE mode, the reference for each AI <0..7> signal is AI SENSE. |
| AO <0,1> |
— | Analog Output Channels—These terminals supply voltage output. |
| AO GND |
— | Analog Output Ground—AO GND is the reference for AO. All ground references—AI GND, AO GND, and D GND—are connected on the device. |
| D GND | — | Analog Input Ground—These terminals are the reference point for single-ended AI measurements in RSE mode and the bias current return point for DIFF measurements. All ground references—AI GND, AO GND, and D GND—are connected on the device. |
| P0.<0..7> | D GND | Port 0 Digital I/O Channels—You can configure each signal individually as an input or output. |
| +5 V | D GND | +5 V Power Source—These terminals provide a fused +5 V power source. |
| PFI<0..7>/P1.<0..7>, PFI<8..15>/P2.<0..7> | D GND | Programmable Function Interface or Digital I/O Channels—Each of these terminals can be individually configured as a PFI terminal or a digital I/O terminal. As an input, each PFI terminal can be used to supply an external source for AI, AO, DI, and DO timing signals or counter/timer inputs. As a PFI output, you can route many different internal AI, AO, DI, or DO timing signals to each PFI terminal. You can also route the counter/timer outputs to each PFI terminal. As a port 1 or port 2 digital I/O signal, you can individually configure each signal as an input or output. |
| USER <1,2> |
— | User-Defined Channel—The USER BNC connector allows you to use a BNC connector for a digital or timing I/O signal of your choice. The USER BNC connector is internally routed to the USER screw terminal. |
| CHS GND |
— | Chassis Ground—This terminal connects to the device metal enclosure. You can connect your cable’s shield wire to CHS GND for a ground connection. |
| NC |
— | No connect—Do not connect signals to this terminal. |