PCI Industrial Communication Interfaces

NI PCI Industrial Communication Interfaces

PCI Industrial Communication Interface Types

PCI Compared with PCI Express Communication Interfaces

How to Select a PCI Industrial Communication Interface

1. Identify the Required Protocol

Start with the connected device, vehicle or industrial equipment documentation. Determine whether the application requires CAN, CAN FD, LIN, FlexRay, RS-232, RS-422, RS-485, industrial Ethernet or another supported interface.

A connector shape does not identify the communication standard. Confirm the protocol, transceiver, signal voltage, pinout, bus topology and communication role before selecting hardware.

2. Verify the Computer Expansion Slot

Inspect the host computer or industrial PC and confirm whether it provides PCI or PCI Express expansion slots. For PCIe cards, review the available slot size, chipset allocation, mechanical clearance and full-height or low-profile bracket requirement.

Newer workstations may provide only PCIe, while established industrial systems can still use legacy PCI. Motherboard compatibility should be confirmed before replacing the communication interface.

3. Determine Port and Channel Count

Count the number of independent networks or serial ports required. Separate CAN buses, isolated vehicle subsystems or independent serial devices can each require a dedicated channel.

For RS-485 systems, determine whether the network uses two-wire or four-wire wiring, half-duplex or full-duplex communication, and one or multiple devices on the bus.

4. Confirm Data Rate and Traffic Load

Record the required baud rate, message frequency, frame type and expected bus loading. The interface must sustain the complete receive, transmit, timestamping and logging workload.

CAN FD applications should verify arbitration-phase and data-phase requirements. High message rates and several simultaneous channels can increase host processing and storage demands.

5. Evaluate Isolation and Grounding

Isolation can help protect the computer from ground-potential differences, electrical noise and transients. It is particularly important when connecting to machinery, vehicle electrical systems, long cables or separately powered equipment.

Isolation does not eliminate the need for correct grounding, shielding and cable routing. Review the complete electrical installation before connecting the communication card.

6. Plan Termination and Cabling

CAN networks normally require termination at both physical ends of the bus. Incorrect termination, excessive stub length or unsuitable cable can create intermittent communication failures.

Serial and industrial network systems also require appropriate cable type, connector pinout and shielding. Confirm the required breakout cable, terminal accessory, adapter and external termination before ordering.

7. Define Timestamping and Synchronization

Vehicle and industrial network logs often need timestamps so messages can be correlated with analog measurements, digital events, commands or faults. Define the required timing accuracy before selecting hardware.

Applications using several communication cards or additional DAQ hardware should verify the available clock, trigger and synchronization methods. A shared host computer does not automatically provide hardware-aligned timestamps.

CAN, CAN FD, LIN and FlexRay Considerations

CAN and CAN FD

CAN is widely used in automotive electronics, battery systems, industrial machinery and mobile equipment. CAN FD extends classic CAN with larger payload capability and, in supported networks, a faster data phase.

Determine whether the application is passive monitoring, message logging, active transmission, ECU simulation or hardware-in-the-loop testing. An active test interface can have different configuration and bus-access requirements from a receive-only logger.

LIN

LIN is used for lower-cost automotive subnetworks and body-electronics functions. Selection should account for master or slave behavior, schedule timing, signal databases and the intended simulation or monitoring role.

FlexRay

FlexRay supports deterministic communication in selected vehicle systems. Verify network topology, channel configuration, timing, synchronization and the required software environment.

RS-232, RS-422 and RS-485 Considerations

RS-232 is generally used for point-to-point communication over shorter distances. RS-422 and RS-485 use differential signaling and are commonly selected for longer cables or electrically noisy industrial environments.

RS-485 can support multidrop networks when the wiring, termination and transmit-direction control are configured correctly. Confirm baud rate, data bits, parity, stop bits, flow control and the connected device’s command protocol.

RS-232, RS-422 and RS-485 are not electrically interchangeable. Use the interface designed for the connected equipment or a suitable external converter.

Software and Driver Compatibility

Supported NI automotive network interfaces commonly use NI-XNET for CAN, CAN FD, LIN and FlexRay communication. Serial interfaces typically use the applicable NI serial or VISA software environment. Other industrial protocols can require their own driver or toolkit.

Before purchasing or replacing a communication interface, confirm:

• Operating-system support
• NI driver and toolkit version
• LabVIEW, TestStand or application compatibility
• Database format and signal-description files
• Application programming interface
• Firmware and hardware revision support

Legacy PCI Communication Interface Replacement

Replacing a legacy PCI card with a PCIe interface requires more than matching the protocol and channel count. The replacement can use different connectors, cables, isolation, transceivers, timestamping methods or software APIs.

Compare the following before approving a replacement:

• PCI or PCIe host-slot compatibility
• Supported communication protocol and physical layer
• Port quantity, isolation and termination
• Connector and cable pinout
• Supported baud rates and frame formats
• Timestamping and synchronization behavior
• Operating-system, driver and application compatibility
• Database and configuration-file support

Requalify communication, message timing, error handling and long-duration logging with the intended equipment before production use.

Typical Applications

• Automotive CAN, CAN FD, LIN and FlexRay logging
• ECU development, validation and diagnostics
• Battery-management-system communication testing
• Hardware-in-the-loop network simulation
• Industrial PLC, drive and controller integration
• Serial instrument and legacy-equipment control
• Production-line communication monitoring
• Automated instrument-control systems
• Vehicle and machinery fault investigation
• Combined network and sensor-data acquisition

PCI Industrial Communication Interface Procurement Guide

FAQ

What is the difference between PCI and PCIe communication cards?

PCI uses a legacy parallel computer bus, while PCI Express uses point-to-point serial links. The slots and connectors are different and are not directly interchangeable.

What is the difference between CAN and CAN FD?

CAN FD extends classic CAN with larger payloads and, in supported networks, a faster data phase. The interface, connected nodes and software must all support CAN FD.

Do CAN interfaces require termination?

A CAN network normally requires termination at its two physical ends. Verify the existing bus topology before adding or enabling termination.

Can an RS-485 device connect to an RS-232 interface?

No. They use different electrical signaling methods. Select the correct interface or use an appropriate external converter.

Can communication data be synchronized with DAQ measurements?

It can be correlated, but achievable timing accuracy depends on the communication hardware, timestamping method, DAQ device and available synchronization architecture.

Related NI Communication and Test Platforms

NI PCI Industrial Communication Interfaces from PXISOURCE

PXISOURCE supports engineers and procurement teams with PCI and PCIe communication-interface selection, protocol and host compatibility review, accessory matching and sourcing for new systems, spare inventory and legacy replacements.