Agilent E8491B IEEE-1394 PC Link to VXI, C-Size Data Sheet • C-size, 1-slot, message-based commander • Industry standard PC-to-VXI interface • High-performance data block transfers • Ease of configuration with hot plug-in capability • Supports multiple mainframes with one PC • Timing and triggering to external devices/mainframes Description The Agilent Technologies E8491B IEEE-1394 PC Link to VXI is a C-size, 1-slot, message-based VXI module, providing a direct connection from your PC to a VXI mainframe via the industry standard IEEE-1394 bus (FireWire). The E8491B is a high-speed C-size device with Resource Manager and Slot 0 capability. Its logical address is 0, therefore it is always the mainframe’s Resource Manager and is typically installed in mainframe Slot 0. The high speed is accomplished, in part, through the use of small signals (200 mV) that are transmitted differentially over the twisted-pair wire set with controlled-impedance characteristics. The differential signal provides high-noise immunity. The E8491B includes a C-size VXI Slot 0 module and a 4.5- meter cable. Ease of configuration is achieved with automatic recognition of a new IEEE-1394-based device without powering down the PC, known as “hot plug-in”. Agilent E8491B The E8491B Option 001 is an OHCI-based IEEE-1394/PCI host adapter card. It is a PC plug-in card capable of transferring data at up to 400 Mbits/second. The card has three external 1394 ports. If required, the OHCI-based IEEE-1394/PCI card can supply 12V at up to 1.5A for IEEE-1394 devices that require power. Refer to the Agilent Technologies Website (www.agilent.com/find/vxi) for recent product updates, if applicable. Data transfer over the IEEE-1394 bus can be either IEEE-1394 Applications Asynchronous or Isochronous. Both types can occur on the same bus. Isochronous data transfers broadcast variable The E8491B is well suited for data acquisition applications amounts of data to multiple “channels” at a regular moving large blocks of data, and it is a cost-effective choice intervals with no acknowledgment. Asynchronous data for test applications when used with Agilent’s E84XX transfers use a “fair arbitration” protocol to ensure each mainframe series. For multiple VXI mainframe systems, IEEE-1394 device has equal access to the bus. The E8491B one E8491B is installed into each mainframe and these are supports asynchronous data transfers to secure equal interconnected via the cable in a daisy-chain, tree or star access for each VXI mainframe. configuration. Up to 16 mainframes can be supported from one PC. This reduces the system cost further since an Large Block (>64 Kbytes) Data Transfer Rate additional OHCI-based IEEE-1394/PCI card is not needed D16 Read D16 Write D32 Read D32 Write for each added mainframe. Kbytes/s Kbytes/s Kbytes/s Kbytes/s Agilent The E8491B includes clock and triggering capabilities, plus E8491B ® complete SICL/VISA I/O library software for the Windows FireWire 8600 10200 12000 14000 ® 95/98/Me/NT 4.0/2000 environments. The interface also Agilent N/A N/A supports 32-bit Interpreted SCPI (I-SCPI). E1406A (Not (Not GPIB 700 700 supported) supported) What is IEEE-1394? Agilent E6235A 200 MHz “FireWire”, “IEEE-1394”, “IEC 1883”…. These titles refer to Embedded a high-speed serial bus that is literally a new standard for VXI PC 8500 1600 14000 3100 transmitting data between PCs and consumer electronics. “FireWire”, as named by its inventors at Apple Computer Product Specifications Inc., was born out of the need for a low-cost, consumer Interface Characteristics oriented connection for applications where large amounts Operating system: Windows 95/98/Me/NT 4.0/2000 of digital audio and video data is recorded, edited, stored, and transferred between devices. The bus’ performance, Controllers: PC based flexibility, and ease-of-use resulted in an implementation I/O Library: SICL/VISA as an I/O interconnect (Agilent E8491B) between external PC backplane: PCI 2.1 with latest BIOS PCs and C-size VXI mainframes. Max. sustained data transfer: 16 bit: 14 MB/sec IEEE-1394’s reduction in cost is, in part, achieved through 32 bit: 14 MB/sec serial data transfer, which uses a simplified cable design. Max. backplane burst rate: 16 bit: 13 MB/sec The IEEE-1394 cable medium allows up to 16 physical 32 bit: 27 MB/sec connections (cable hops) on one bus segment, each up to 64 bit: 53 MB/sec 4.5 meters in length. (The cable supplied with the E8491B Languages: C/C++, Visual Basic, Agilent VEE, is 4.5 meters.) This gives a system using IEEE-1394 a total LabVIEW/VISA, cable distance of 72 meters. The data is transmitted over LabWindows/VISA one of the cables’ twisted-pair sets, while the other twisted- pair set is used for the clock. The clock makes a transition General Characteristics when the data line does not, allowing a simple, Interface: IEEE-1394 exclusive-OR gate to be used for clock recovery. Slot 0 functions: Yes Resource manager: Yes IEEE-1394’s reduction in cost and ease of use are also Extended VXIbus resource manager: Yes attained through simplified electronics. Its transmitters and receivers, which are available as a standard chip set, CLK10: Yes handle addressing, initialization, arbitration and protocol. The plug-and-play nature of the IEEE-1394 bus is also achieved in this chip set. Node addresses, for example, are assigned to devices on the bus upon power-up. 2 Ordering Information CLK10 Input: TTL Description Product No. Output: TTL IEEE-1394 PC Link to VXI, C-Size E8491B OHCI-Based IEEE-1394/PCI Card E8491B 001 Stability: ± 100 ppm E8491B Front Panel (See Note 1) E8491-00202 FireWire Cable, 4.5 m (See Note 2) E8491-61603 Trigger Input Levels: TTL, ECL, CMOS, ± 30 V Note 1: Upgrade existing E8491A to E8491B performance with E8491B Opt. UP1 Input load: 55 k Ω, 50 pF Upgrade Kit. This kit includes OHCI-based IEEE-1394/PCI card and E8491B Maximum rate: 2 MHz software. To upgrade E8491A to E8491B physical appearance, install E8491B Front Panel (part number E8491-00202) and new 4.5 m FireWire Cable (part Minimum pulse width: 200 ns number E8491-61603). Original Agilent E8491A warranty remains in place after Maximum trigger delay: 300 ns upgrade. Note 2: FireWire cables are available in other lengths and can be ordered from: Trigger Output Molex, Inc., Telephone: (800) 78-MOLEX Max level: + 30 V http://www.molex.com. Cable Length ® ® Windows and Windows NT are U.S. registered trademarks of Microsoft Corporation. Maximum lengths: 4.5 m between devices Bus maximum length: 72 m total per system Maximum number of mainframes per system: 16 General Specifications VXI Characteristics VXI device type: Message-based commander Data transfer bus: A16, A24, A32, D08, D16, D32, D64 Size: C Slots: 1 Connectors: P1/P2 Shared memory: 128 kB VXI buses: TTL Trigger Bus, ECL Trigger Bus Module Current I (A) I (A) PM DM +5 V: 2.5 0.001 +12 V: 0.35 0.050 –12 V: 0.015 0.001 +24 V: 00 –24 V: 00 –5.2 V: 0.180 0.001 –2 V: 0.360 0.001 Cooling/Slot Watts/slot: 20 ∆P mm H O: 0.10 2 Air flow liter/s: 2.0 3 Agilent Technologies’ Test and Measurement Support, Services, and Assistance Agilent Technologies aims to maximize the value you receive, while minimizing your risk and problems. We strive to ensure that you get the test and measurement capabilities you paid for and obtain the support you need. 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