Types of Machine Vision Cable Connectors
- CoaXPress (CXP)
Design: Coaxial cable with BNC or DIN 1.0/2.3 connectors.
Bandwidth: Up to 12.5 Gbps per lane (CXP-12) or 25 Gbps (CXP-25).
Best For: Ultra-high-speed imaging (e.g., 8K video inspection, semiconductor metrology).
Pros:
Supports long cable lengths (up to 40m with repeaters).
Low latency for real-time processing.
Cons: Higher cost than GigE/USB.
Example: Fujikura CXP-12 cable for multi-camera PCB AOI systems.
2. GigE Vision (RJ45/M12)
Design: RJ45 (standard Ethernet) or ruggedized M12 connectors.
Bandwidth: 1 Gbps (GigE) to 10 Gbps (10GigE).
Best For: General-purpose vision systems (e.g., automotive assembly, logistics).
Pros:
Cost-effective and widely compatible.
M12 variants resist vibration and moisture (IP67/IP69K).
Cons: Limited to 100m (copper) without repeaters.
Example: M12-X-coded GigE cables for AGV-based warehouse robots.
3. USB3 Vision (USB Type-A/Micro-B)
Design: Standard USB 3.0 (Type-A) or industrial Micro-B connectors.
Bandwidth: 5 Gbps (USB3) to 20 Gbps (USB4).
Best For: Compact systems and benchtop inspection (e.g., medical devices, electronics).
Pros:
Plug-and-play simplicity.
Active optical cables (AOC) extend range to 100m.
Cons: Susceptible to EMI in noisy environments.
Example: L-com USB3 AOC for pharmaceutical blister pack inspections.
4. Camera Link (MDR26/HSD)
Design: 26-pin Micro-D (MDR26) or High-Speed Density (HSD) connectors.
Bandwidth: Up to 6.8 Gbps (Camera Link Base) to 85 Gbps (Camera Link HS).
Best For: High-speed line scan cameras (e.g., print quality control, solar cell inspection).
Pros:
Robust for factory floors.
Low CPU load with FPGA-based frame grabbers.
Cons: Declining popularity due to rising costs and complexity.
Example: Teledyne Dalsa HSMC cables for web inspection at 500 m/min.
5. M12/M8 Circular Connectors
Design: Threaded circular connectors with 4–12 pins.
Variants:
M12 D-coded: GigE Vision.
M12 X-coded: 10GigE.
M12 L-coded: Power-over-Ethernet (PoE).
Best For: Harsh environments (e.g., food processing, automotive welding).
Pros:
IP67/IP69K-rated for dust, water, and chemical resistance.
Vibration-proof with screw-lock mechanism.
Example: Turck M12 X-coded for dairy plant washdown areas.
6. Fiber Optic Connectors (LC/SC/ST)
Design: LC (small form-factor), SC, or ST connectors.
Bandwidth: 10 Gbps to 400+ Gbps (multimode/single-mode).
Best For: Long-distance, EMI-heavy, or high-voltage zones (e.g., power plants, aerospace).
Pros:
Immune to EMI/RFI.
Lightweight and low signal loss over kilometers.
Cons: Higher initial cost and fragile connectors.
Example: Hitachi LC/PC fiber cables for wind turbine blade drone inspections.
7. Hybrid Connectors
Design: Custom combinations of power, data, and I/O in one housing (e.g., Harting Han®).
Bandwidth: Varies (often GigE + 24V power).
Best For: Robotics and multi-camera rigs needing simplified cabling.
Pros:
Reduces cable clutter.
Customizable pin configurations.
Cons: Limited off-the-shelf availability.
Example: Harting Han® 10 GigE for automotive paint shop robots.
Key Selection Criteria
Speed: Match connector bandwidth to camera resolution and frame rates.
Environment: IP ratings, temperature range, and chemical resistance.
Durability: Vibration tolerance and flex life (e.g., M12 vs. RJ45).
Cost: Balance upfront price with total lifecycle costs (e.g., fiber vs. copper).
Industry Trends
Rise of M12 X-coded: Replacing RJ45 in Industry 4.0 due to ruggedness.
Fiber Adoption: Growing in EV battery and semiconductor fabs for EMI-free data.
USB4: Emerging for compact systems needing 40 Gbps speeds.