Description
AGILENT(Keysight) E8491B IEEE‑1394 PC‑Link to VXI Module
Discontinued C‑size VXI Slot‑0 resource‑manager controller; FireWire(IEEE‑1394) interface connects PC to VXI mainframe, for automated test & data‑acquisition systemshelpfiles….。
Technical Specifications
- Product Model: E8491B
- Brand: Agilent / Keysight
- Warranty: One Year
- VXI Form: C‑size, single‑slot, message‑based VXI module
- Mandatory function: Slot 0 controller, VXI Resource Manager, logical address 0
- Host Interface: IEEE‑1394 (FireWire), max 400 Mbit/s differential twisted‑pair; hot‑plug supported是德科技
- Option‑001: OHCI‑compliant PCI‑1394 host adapter card for PC side (3‑port 1394)Keysight
- Standard accessory: 4.5 m IEEE‑1394 cable
- VXI Backplane: P1+P2 connector; shared memory 128 KB; access TTL / ECL trigger bus
- Typical Throughput: 16‑bit 1.76 MB/s PC‑direction; 32‑bit ~1.0 MB/s
- Software: VISA / IO‑Libraries‑Suite; programming support: C/C++, VB, LabVIEW, VEE
- Operating Temperature: 0 °C ~ +55 °C; 5‑95 %RH non‑condensing
- Storage Temperature:‑40 °C ~ +70 °C
- Protection Class: IP20 VXI module; powered by VXI mainframe backplane
- Mechanical: C‑size VXI dimension; weight approx. 720 g

Product Overview
E8491B is VXI‑mainframe slot‑0 controller module. It bridges PC and VXI instrument chassis via IEEE‑1394 FireWire bus, takes charge of VXI resource‑management, enumerates all VXI modules inside mainframe, transfers commands and large‑block measurement data between PC and VXI instruments.
Important notes:
- Must install in Slot 0 of VXI mainframe (e.g. Agilent E840xA series). Logical address fixed at 0, cannot assign other logical address.
- Cannot extend VXI backplane across multiple mainframes; modules requiring VXI‑Local‑Bus must reside inside same chassis.
- End‑of‑life product; no new production, only spare‑part supply.
- Two‑part system: E8491B(VXI‑card) + PC‑side 1394 host adapter (Option‑001 or third‑party OHCI‑1394 card).
Application Scenarios
- Automated test system: VXI‑based ATE test benches for aerospace, defence, electronic‑component validation
- High‑speed data‑acquisition: multi‑channel VXI digitizer / multiplexer measurement system
- Lab R&D measurement setup: control VXI instruments from Windows PC
- Retrofit & spare‑part replacement for legacy E84XX VXI mainframe installations







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