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PC Based Industrial Automation

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This months featured product is the ADAM-4520 RS-232 to RS-485 converter.
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ADAM-6521 Industrial Ethernet Switch with 4 x 10/100Base-TX Ports & 1 Fiber Optic Port

Download PDFDownload the ADAM-6521 data sheet.


ADAM-6521 ModuleThe ADAM-6521 series are industrial-grade 5 port Ethernet switches with one fiber optic port that makes it possible to expand industrial networks easily and cost-effectively. Available for multi-mode fiber with SC or ST connectors or for single-mode fiber with an SC connector. With fiber optics, you can prevent electrical noise interfering with your system and implement transmission distances up to 15 km. A wide operating temperature range from -10 to 65°C makes it suitable for harsh operating environments. Each port has a pair of LEDs that indicate link status and transmission speed. This function conveniently informs users of any collisions, the link status, power failure and data receipts for immediate on-site diagnostics.


  • Provides 4 x 10/100 Mbps Ethernet ports with RJ-45 connector
  • Provides 1 x 100Mbps multi/single mode fiber port with SC/ST connector
  • Supports full/half duplex flow control
  • Supports MDI/MDI-X auto crossover
  • Provides broadcast storm protection
  • Embedded with a switch controller, supports auto-negotiation
  • Provides surge (EFT) protection 3000VDC for power line (ADAM-6521L not equipped)
  • Supports 4,000 VDC Ethernet ESD protection (ADAM-6521L not equipped)
  • Easy mounting on DIN-rail, panel or piggyback
  • Wide operating temperature range : -10 ~ 65°C



  • Standard IEEE 802.3, 802.3u, 802.3x
  • LAN 10/100Base-TX, 100Base-FX
  • Transmission Distance
    Ethernet: Up to 100m
    Multi-mode fiber: Up to 2km (ADAM-6521, ADAM-6521/ST)
    Single-mode Fiber: Up to 15km (ADAM-6521S)
  • Transmission Speed Up to 100Mbps


  • Connectors
    4 x RJ-45
    1 x SC type fiber connector (ADAM-6521, ADAM-6521S)
    1 x ST type fiber connector(ADAM-6521/ST)
    2-pin pluggable screw terminal for power
  • LED Indicators Power, Link/Speed

Power Requirements

  • Power Input Unregulated 10 - 30VDC
  • Power Consumption
    ADAM-6521S: Max 4W
    ADAM-6521/6521/ST: Max. 3W


  • Dimensions (H x W x D) 70 x 130 x 30mm
  • Enclosure ABS + PC with solid mounting hardware
  • Mounting DIN 35 rail, stack, wall


  • ESD (Ethernet) 4000VDC (ADAM-6521L not equipped)
  • Surge (EFT for power) 3000VDC (ADAM-6521L not equipped)


  • Operating Temperature
    -10 ~ 65°C, Stack : -10 ~ 60°C
  • Storage Temperature
    -20 ~ 80°C
  • Operating Humidity 20 to 95% RH (non-condensing)
  • Storage Humidity 0 to 95% RH (non-condensing)
  • MTBF 1 150 000hrs


  • Safety
    UL 60950-1, CAN/CSA-C22.2 No.60950
  • EMC
    U.S.A.: FCC Part 15 CISPR 22
    EU: EN55011, EN61000-6-4, EN55022 Class A, EN61000-3-2/3,
    EN55024, IEC61000-4-2/3/4/5/6/8/11, EN61000-6-2