Description
The NI PCIe-7822R, with part number 785360-01, is a Digital I/O Reconfigurable Device designed for versatile applications, featuring an output scope for AO channels at ±10 V in bipolar format. Users can configure power-on levels by loading and running a VI to set desired voltage levels, where the VI utilizes a two’s complement data format for interpretation. The device comes with a shielded cable, the SH68-C68-S, which includes 34 twisted pairs of conductors for robust signal integrity.
For I/O expansion, the NI PCIe-7822R has some DIO lines twisted with power or ground for high-quality signal transmission, recommended for high-frequency or edge-sensitive signals such as clocks, triggers, PWM, encoders, and counter signals. Conversely, other DIO lines are twisted with additional DIO lines, which are best suited for static or low-frequency signals like LEDs, switches, and relays, to minimize noise coupling.
Additionally, the device boasts an RTSI trigger bus feature with eight shared trigger lines, which are easily accessible via a ribbon cable connected to the RTSI connector, facilitating synchronization and communication between multiple devices.
| Technical Specifications for NI PCIe-7822R | |
|---|---|
| Part Number | 785360-01 |
| Product Type | Digital I/O Reconfigurable Device |
| Output Scope for AO Channels | ±10 V (bipolar) |
| Power-On Levels Configuration | Load and run a VI to set desired voltage levels |
| VI Data Format | Two’s complement |
| Shielded Cable | SH68-C68-S |
| Conductor Pairs | 34 twisted pairs |
| I/O Expansion | Some DIO lines twisted with power/ground, some with other DIO lines |
| Recommended Signal Use | High-frequency/edge-sensitive on power/ground twisted lines, static/low-frequency on DIO twisted lines |
| Examples of High-frequency/Edge-sensitive Signals | Clocks, triggers, PWM, encoders, counter signals |
| Examples of Static/Low-frequency Signals | LEDs, switches, relays |
| RTSI Trigger Bus | Eight shared trigger lines, accessible via ribbon cable on RTSI connector |
Question 1: What are the benefits of using the shielded SH68-C68-S cable with 34 twisted pairs that comes with the NI PCIe-7822R Digital I/O Reconfigurable Device, especially for high-frequency or edge-sensitive signals?
Answer 1: The NI PCIe-7822R ensures signal integrity for high-frequency or edge-sensitive applications by having some DIO lines twisted with power or ground, which is recommended for maintaining high-quality signal transmission in such demanding scenarios.
Question 2: What is the bipolar output voltage range for AO channels on the NI PCIe-7822R Digital I/O Reconfigurable Device, and how are power-on levels set using VI?
Answer 2: The shielded SH68-C68-S cable with 34 twisted pairs that comes with the NI PCIe-7822R Digital I/O Reconfigurable Device offers robust signal integrity and is beneficial for high-frequency or edge-sensitive signals, such as clocks, triggers, PWM, encoders, and counter signals, because the twisted pairs reduce electromagnetic interference and crosstalk, thus enhancing the quality and reliability of signal transmission.
Question 3: What are the recommended applications for the twisted DIO lines with power or ground on the NI PCIe-7822R, and how does the RTSI trigger bus feature enhance device synchronization?
Answer 3: The twisted DIO lines with power or ground on the NI PCIe-7822R are recommended for high-quality signal transmission in high-frequency or edge-sensitive applications, such as clocks, triggers, PWM, encoders, and counter signals, and the RTSI trigger bus feature with eight shared trigger lines enhances device synchronization by allowing multiple devices to communicate and synchronize through a ribbon cable connected to the RTSI connector.
Question 4: How does the NI PCIe-7822R ensure signal integrity for high-frequency or edge-sensitive applications?
Answer 4: The NI PCIe-7822R’s DIO lines that are twisted with power or ground are recommended for transmitting high-frequency or edge-sensitive signals such as clocks, triggers, PWM, encoders, and counter signals, while the DIO lines twisted with other DIO lines are best suited for static or low-frequency signals like LEDs, switches, and relays.
Question 5: What are the recommended types of signals to transmit using the DIO lines of the NI PCIe-7822R that are twisted with power or ground, and which type of signals should be transmitted using the lines twisted with other DIO lines?
Answer 5: The bipolar output voltage range for AO channels on the NI PCIe-7822R Digital I/O Reconfigurable Device is ±10 V, and power-on levels are set by loading and running a VI that interprets the desired voltage levels in a two’s complement data format.
