FireSpy® 3850/3852

The Triple Series PCI hosted FireSpy 3850, 3851E and 3852 provides three FireSpy bus analyzer engines in one compact package. Designed to meet the requirements of AS5643-based triple-redundant bus architectures, all the FireSpy385x products allow to be connected to three separate IEEE-1394 buses while connecting to three synchronized analysis engines. Based on our 2nd generation hardware platform, the FireSpy385x products contain 1GB internal memory and a powerful processor to provide the resources needed to service all three buses. The 32-bit PCI 2.1 host interface allows communication with the FireSpy to be much faster than similar products with USB 2.0 or Ethernet interfaces.

The FireSpy3850 brings out six active transformer coupled ports, two from each bus analyzer engine, through a single high-density (VHDCI) connector to six IEEE-1394 Beta 9-pin cables. Additionally, it has three, one from each bus analyzer, IEEE-1394 bilingual 9-pin connectors.

The FireSpy3851E is the same as the 3850 except it provides mechanical support to help stabilize the VHDCI connection.

The FireSpy3852 brings out six active transformer coupled ports, two from each bus analyzer, to 6 LEMO connectors.

The AS5643/1 active transformer coupled ports can only operate at S400 and S800 Beta mode data rates, while the bilingual ports can operate in S100, S200 and S400 legacy mode and S400 and S800 Beta mode.

The FireSpy385x products utilize the same FireDiagnostics Suite™ software as all other FireSpy bus analyzers. However, all three bus analyzer engines are presented in a single GUI. FireDiagnostics Suite™ software supports Windows™ Operaing Systems. Additionally, the FireDiagnostics Suite API allows you to build your own control software using C/C++ or LabVIEW™.

The seamless integration of the AS5643 protocol makes the FireSpy385x products the preferred tool for many Aerospace & Defense development, testing and product qualification tasks. DapTechnology has made considerable efforts to fully support the SAE AS5643/Mil1394 protocol in all major functional areas of the FireSpy385x and continuously updates the analyzer functionality according to implementation requirements and ongoing standardization efforts.

Life Cycle Status

End of Sales     Aug 2020
not recommended for new designs
replaced by: FireSpy3422bT

Key features

  • IEEE-1394-2008 compliant
  • Supported speeds depend on exact model:
    • FireSpy3850/3851E: one (1) Port (per bus): S100-S400 Legacy and S400 -S800 Beta, two (2) Transformer-coupled ports (per bus): S400-S800 Beta
    • FireSpy3852: two (2) Transformer-coupled ports (per bus): S400-S800 Beta
  • Host connection to PC via PCI 2.1 interface
  • On-board 400 MHz RISC processor and programmable logic
  • 1GB internal memory
  • GUI and API for WindowsTM Operating Systems
  • 3 analyzing nodes in one product
    • FS3850/FS3851 Ports
      • 6, two from each analyzer, active transformer coupled ports
      • 3, one from each analyzer, standard IEEE-1394 bilingual ports (9-pin)
    • FS3852 Ports
      • 6, two from each analyzer, active transformer coupled ports using 6x LEMO connectors
  • Enhanced Scriptor functionality for real-time monitoring and asynchronous packet generation
  • Powerful software provides:
    • Monitor
    • Recorder
    • Commander
    • Scriptor (programmable in C-like language)
    • Generator
    • Filter and Trigger
    • Mil1394 Signal Monitor
  • Support for AS5643, AV/C, SBP2, IP1394 and IIDC protocols
  • Internal SelfTest
  • C/C++ API with LabVIEWTM Wrappers

Block Diagram

FireSpy® 385x specifications

Dimensions: Half length PCI card, 15mm x 106mm x 174mm
Weight: 150 g
Power Requirements: 10 Watt maximum
Regulatory compliance: FCC Class A , CE

32bit/33MHz PCI connector, universal keyed (for 3.3V and 5V slots)

FS3850: High-density (VHDC type) connector for 6 active transformer coupled 1394 Beta ports and 3 xIEEE-1394 9-pin bilingual connectors

FS3851: same as FS3850 with enhanced VHDCI stability

FS3852: 6 LEMO connectors for 6 active transformer coupled 1394 Beta ports

Indicators: -
Switches: -
Part Number:

FS385 ( FS385AS5643 with AS5643 SW protocol package)

FS3851E ( FS3851EAS5643 with AS5643 SW protocol package)

FS3852 ( FS3852AS5643 with AS5643 SW protocol package)



HTS: 8471.90.0000


SW Add-on modules:





SBP2 protocol software package

IIDC protocol software package

AV/C protocol software package

IP1394 protocol software package

AS5643 protocol software pack

FireSpy® 385x media files

Product Image(s)

Connectivity Example(s):

FireSpy® 385x sales info

Package Contents

  • FireSpy 3850
    • FireSpy PCI card
    • 3 x 1394b Cable (Beta - Beta)
    • 1394 Adapter Cable (SCSI – 1394Beta (x6))
  • FireSpy 3851E
    • FireSpy PCI card
    • 3 x 1394b Cable (Beta - Beta)
    • 1394 Adapter Cable (SCSI – 1394Beta (x6))
  • FireSpy 3852
    • FireSpy PCI card
    • 3 x 1394b Cable (LEMO - Beta)

Delivery time

Lead time is based on special project terms. Please contact sales(at) for more detailed information.


Standard: 36 months, limited.


All products will be supported on a 24 hours response basis and free of charge for the first 24 months. For support questions please contact: sales(at)

Of course you can also call us during our office hours from 9:00 until 17:00 hours (GMT +1:00). Contact Info

Price Info / Quote Request

Please contact sales(at) for current pricing.

Country Distributor Phone URL
China BEIJING CESITEK CO., LTD. +86 10 84177715
Japan Nacelle Co. Ltd. +81-3-5921-5099
United States of America DapUSA, Inc +1 480 422 1551
South Korea Realtimewave Co. Ltd. +82-31-698-2980/2
all other countries Dap Technology B.V. +1-514-453-4111

Click here for a more detailed listing of our Sales Representations.

USA Representatives

For the U.S.A., we have as representatives:

Representative Territory Phone URL
Dap USA Office Arizona Entire United States of America +1 480 422 1551


To place an order for DapTechnology products, please print one of the following order forms and email it to the corresponding email address:

Dap USA, Inc.
Download order form

Or contact us by phone: +1 480 422 1551

Rest of the world:
Dap Technology B.V.
Download order form

Or contact us by phone: +1 480 422 1551

FireDiagnostics Suite

The FireDiagnostics Suite is the most comprehensive collection of 1394 analysis, simulation and interface tools for a wide range of applications. Apart from well established and hardware assisted analyzer tools like Monitor, Recorder, Generator, Commander, Scriptor and Mil1394 Signal Monitor, the suite also offers a set of software tools designed to allow the integration of the FireSpy products in a wide variety of testing applications, as well as extend customization of its functionality beyond the baseline feature set provided by DapTechnology.

FireSuite API

The foundation for all software tools included in the FireDiagnostics Suite is formed by the Application Programming Interface (API). With its interfaces for a wide range of development environments using C/C++ or LabVIEWTM on WindowsTM Operating Systems, the application of FireSpy analyzers is extremely flexible. With its feature-rich function library, all hardware assisted analyzer tools like the Monitor and Recorder can be controlled as well as more low-level 1394 bus functions.

Protocol Support

A cornerstone of FireDiagnostics Suite functionality is the unparalleled level of support for high-level protocols. With IEEE-1394 being the basic data exchange mechanism application specific protocols for the PC & storage environment (IPv4, SBP2), consumer electronics (AV/C, HAVi), Automotive Infotainment (AMI-C), Industrial Imaging (IIDC) have been successfully deployed. In recent years AS5643 has been adopted for use within Aerospace and Defense and largely fueled the continuous growth of IEEE-1394.