ADLINK PCIe-U300 Series USB3 Vision Acquisition Card Deployment Guide

ADLINK PCIe-U300 Series USB3 Vision Acquisition Card Deployment and Power Management

In the field of industrial machine vision and automation inspection, USB3 Vision has quickly become one of the mainstream choices for camera interfaces due to its plug and play, high bandwidth (5Gbps), and low-cost cables. However, multi camera systems often face challenges such as USB controller bandwidth competition, insufficient power supply, and hot swappable reliability. The ADLINK PCIe-U300 series frame acquisition card provides a professional level solution for multi camera vision systems by integrating multiple independent USB 3.0 controllers, a power supply capability of up to 1500mA per port, and software programmable power management. This series includes 4-port (U304), 8-port (U308), and 12 port (U312) models, all based on PCIe x4 Gen2 bus, ensuring sufficient transmission bandwidth for each port. This article will provide engineers with a detailed operation guide from the aspects of hardware selection, power supply planning, installation configuration, status diagnosis, and common troubleshooting, to help them efficiently deploy a stable USB3 Vision acquisition system.

Product series and selection criteria

The core advantage of the PCIe-U300 series is the use of four independent Fresco FL1100 USB 3.1 Gen 1 controllers, each connected to an x4 Gen2 (5 GT/s) bus through a PCIe switch. This design enables:

U304 (4 ports): Each port has an exclusive controller, which does not interfere with each other and is suitable for high bandwidth, low latency applications (such as multiple high-speed cameras simultaneously capturing data).

U308 (8 ports): Two ports share one controller (4 controllers in total), suitable for medium load scenarios.

U312 (12 ports): Among them, 8 ports are similar to U308, and the other 4 ports are led out through internal 20 pin expansion interfaces and need to be used with expansion brackets, suitable for high-density and low-cost deployment.

When selecting, it is necessary to comprehensively consider the number of cameras, single camera bandwidth (resolution/frame rate), and total power requirements. If there are four or more 5-megapixel @ 60fps cameras, U304 is more secure; If it is mostly a low bandwidth camera or intermittent acquisition, U308/U312 is more cost-effective.

USB power supply capability and power planning

1. Power supply specifications for each port

Front panel Type-A port: 5V ± 5%, maximum 1500mA

U312 expansion port (internal interface output): 5V, maximum 900mA

The typical power consumption of industrial USB cameras is 3-6W（ 5V@600 ~1200mA）， Therefore, 1.5A per port is sufficient to cover most models. However, it should be noted that if cameras with additional loads (such as circular light sources) are used, they may need to be downgraded.

2. Total power budget and power source

The USB power supply on the card is converted from the+12V provided by the PCIe slot of the host, and there are two types of power sources:

Only PCIe slots (without 4-pin Molex) can provide a maximum total power of 20W. In this mode, if all four ports of U304 are full (4 × 5V × 1.5A=30W), it has exceeded the limit, and the actual current of each port needs to be limited or only some ports need to be used.

External 4-pin Molex (CN10): can provide additional power to increase the total USB output capability to:

U304/U308: Maximum 30W

U312: Maximum 60W

Recommended practice: As long as the system load exceeds 20W, be sure to connect a 4-pin Molex auxiliary power supply (12V input, at least 4A output), otherwise it may cause system restart or USB device disconnection due to insufficient power supply. The Molex connector pins are defined as: 1=+12V, 2=GND, 3=GND, 4=+5V (this 5V is reserved, and the actual power supply is still converted from 12V). A cable of 16AWG or above is required for connection.

3. Overcurrent protection (OCP)

Each USB port is equipped with a hardware current limit. When the current exceeds the rated value (approximately 1700mA ± 7% for ports 1-81100mA ± 7% for ports 9-12), the port automatically cuts off power supply. After triggering, the host needs to be restarted to recover, and cannot be reset through software. Therefore, it is necessary to ensure that the nominal current of each camera is lower than the rated value and leave sufficient margin.

4. Software programmable power switch

ADLINK provides AVS SDK (USB Power Management API), which allows users to individually turn on or off the power supply to each port through the software. This is extremely useful when the camera is deadlocked or requires remote reset, without the need for physical cable plugging and unplugging. The example code only needs to call a few lines of API to implement, simplifying system maintenance.

Hardware installation and interface layout

1. Physical installation

Insert the card into a PCIe x4, x8, or x16 slot (occupying x4 bandwidth) and secure the bezel.

U312 precautions: In addition to the 8 USB ports on the front panel, there are also 4 ports that are led out through the onboard 20 pin internal pin header. The accompanying expansion bracket cable needs to be connected to this connector and the bracket needs to be fixed in the idle PCI board position of the chassis.

If connecting an external Molex power supply, be sure to connect it properly before turning it on to avoid hot swapping.

2. Card ID setting (SW1)

When installing multiple PCIe-U300 cards in the system, a unique ID (0~15) needs to be assigned to each card through the SW1 4-digit DIP switch, with a default ID of 15 (all ON). ID is used by software to identify different devices and ensure correct API calls. After setting, it needs to be restarted to take effect.

3. Status LED diagnosis

Onboard 9 LEDs (1-9) indicate PCIe link status and USB controller status:

LED 2/6/7/8 (upstream link):

Extinguish: Upstream function disabled (abnormal)

Always on: PCIe x4 Gen2 normal (default)

Blinking: Insufficient bandwidth (possibly due to insertion into x1 slot or high bus load)

LED 1/3/4/5 (downstream link to USB controller):

Extinguish: Downstream function disabled (abnormal)

Always on: Normal

LED 9 (PCIe switch error):

Extinguish: Normal

Always on: An unexpected error occurred in the switch

If the LED flashes or is abnormal, first check if the slot is x4 or above, and confirm the PCIe link speed setting in the BIOS.

Driver and software environment preparation

1. Operating system requirements

Windows 7/10 (64 bit recommended), also supported by Linux.

Windows 7 special requirements: Microsoft Kernel Mode Driver Framework v1.11 and VNet 033929 patch must be installed (otherwise FL1100 driver cannot be installed). It is recommended to use Windows 10 directly to avoid this issue.

2. Driver installation

USB 3.0 Host Driver: Download the FLUSB3.0 driver (applicable to FL1100) from ADLINK or Fresco Logic official website.

Power Management SDK: ADLINK provides AVS-SDK, including USB port power control API, without additional authorization.

Installation sequence: First install the USB controller driver, then install the AVS-SDK. After installation, the device manager should display multiple 'Fresco Logic USB 3.0 Host Controllers' and corresponding root hubs.

Common troubleshooting and solutions

1. The camera cannot recognize or there is no image

Check power supply: Use software to read the port current status (AVS API) and confirm that the voltage/current is normal. If overcurrent protection is triggered, the host needs to be restarted.

Check the cable: USB 3.0 cables must comply with the standard. Poor quality cables may cause a speed drop to USB 2.0 (480Mbps), affecting image transmission. It is recommended to use high-quality cables with shielding, with a length not exceeding 5 meters (limited by USB 3.0 specifications).

Check bandwidth: If multiple high bandwidth cameras are working simultaneously, it may exceed the total bandwidth of a single controller (approximately 400MB/s actual). You can try assigning the camera to ports on different controllers (U304, each port is independent and there is no such problem); U308/U312 should pay attention to port grouping. Insufficient bandwidth can be determined by the flashing status LED.

2. System instability or blue screen

Insufficient power supply: If Molex is not connected and the total load exceeds 20W, it may cause a+12V voltage drop, leading to system restart. Be sure to connect an external power source as required.

PCIe slot limitation: Some motherboard x16 slots actually only support x1 or x2 links, which can be confirmed by LED 2/6/7/8 status. If it flashes, you need to replace the slot or check the BIOS settings.

3. Frequent triggering of overcurrent protection

Check the rated current of the connected camera. If it is close to 1.5A, it is recommended to replace the low-power camera or use external power supply (cut off USB power supply).

Possible port short circuits or cable damage, eliminate them one by one.

4. Resource conflicts when multiple cards are used simultaneously

Each card is assigned a different ID through SW1, and the driver will automatically recognize it. If there is an ID conflict, the system only recognizes one of them.

Multiple cards jointly consume PCIe resources, and it is necessary to ensure that the motherboard chipset supports sufficient PCIe channels (such as using Intel C612/C621, etc.).

5. U312 expansion port is not working

Confirm that the internal 20 pin ribbon cable is securely connected to the expansion bracket and the bracket is well secured.

The current limit of the expansion port is relatively low (900mA). If the camera requires higher voltage, it may cause undervoltage. Please use the front panel port instead.

Performance optimization and maintenance recommendations

Bandwidth allocation: For U308/U312, understand the mapping relationship between ports and controllers (usually every two ports share one FL1100). You can determine the "location" information by viewing it through the device manager. Distribute high bandwidth cameras to different controllers as much as possible.

Firmware update: Regularly visit the ADLINK official website to obtain the latest firmware and drivers, and fix known issues.

Attention to heat dissipation: Under high load, the power conversion circuit on the card may generate heat. Ensure good ventilation of the chassis (working temperature 0~60 ° C).

Cable management: Avoid excessive bending or entanglement of USB cables to reduce signal attenuation and mechanical damage.