HP manual HP E8491A PC to VXI Interconnect, Pin #

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shields
signal pair wires		connector
		1	3	5
		2	4	6
6.1 mm	PIN #		COMMENT
	1		cable power
	2		cable ground
	3/4	strobe on receive,
	3/4		data on transmit
			data on transmit
	5/6		data on receive,
	5/6	strobe on transmit
power wires		strobe on transmit
power wires

Figure 4-4. Cross-section of the IEEE 1394 Cable.

The HP E8491A PC to VXI Interconnect

The power wires route power from the host adapter to devices (nodes) on the bus, whether the devices are turned on or off. Since each device in the system acts as a repeater, the power supplied to a device that is turned off enables signals to be transferred across that device. This maintains signal continuity throughout the system.

The E8491A is a VXI C-size device (Figure 4-5) normally installed in mainframe slot 0. With a logical address of 0, the E8491A functions as the mainframe’s resource manager via software included with the I_O libraries. The E8491A has 128 kBytes of shared RAM and contains many of the clock and triggering features found on the HP E1406A Command Module - a VXI resource manager/slot 0 device common in many GPIB-based systems. A VXI mainframe with the HP E8491A in slot 0 can also be powered on/off at any time without affecting other mainframes in the system.

The HP E8491A IEEE 1394 interconnect links the VXI backplane to the IEEE 1394 bus. However, the E8491A and the IEEE 1394 bus do not extend the (VXI) backplane between frames in multi-frame VXI systems. This means that the multimeter and multiplexers in a VXI scanning multimeter for example, must be installed in the same mainframe. Devices sharing the VXI Local bus must also be installed in the same mainframe.

62 IEEE 1394 Fundamentals and Interface Overview

Chapter 4

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Contents Contents Chapter Index Contents HEWLETT-PACKARD Warranty Statement Documentation History Manufacturer’s Name Page Business Reply Mail Page Interface Installation Configuration Component OverviewVXI Programming Using Ieee 1394 Serial Bus Additional InformationInterface Installation and Configuration Installing Ieee Host AdapterLayout of the Adaptec AHA-8940 1394-to-PCI Host Adapter Locating a PCI bus Expansion Slot Connecting the Power Cable Installing HP E8491A Interconnect Where to go NextPage Connecting the HP E8491A to the Host Adapter Installing VXI Instruments InstrumentsInstalling C-size Instruments Installing A- and B-size Instruments Shows the installation of A- and B-size instrumentsPage Interface Installation and Configuration Chapter Configuring the HP E8491A Interconnect 10. The HP IO Libraries Program Group11. The HP IO Libraries IO Config Utility Editing the HP E8491A Configuration 12. Editing the HP E8491A ConfigurationInstrument Drivers InstallingEditing the HP E8491A Configuration on Windows 95 Platforms Verifying the Installation Viewing the Resource Manager Output 17 is a partial listing of a typical resource manager output Page Running the Resource Manager Page VXI Programming Using the Ieee 1394 Serial Bus Optimizing Programs Block Data TransfersBlock Transfers using HP VXIplug&play Drivers For i=0 i10 i+=2 Printf%lf\n\n,dataPtri*range/32768 Comments HP Visa Error checking routine Comments HP E8491A Triggering TTLTRG7 TTLTRG0Configuring the E8491A Trig In and Trig Out Ports ItrigallTurn off the autozero function iprintfe1412, Zeroauto OFF\n Program, ivxitrigroutee8491s, ITRIGEXT0 Using HP E8491A Shared Memory Locating E8491A Shared MemoryLocating Shared Memory Using HP Visa Starting address of E8491A shared Memory hexadecimal Storing Readings Shared Memory HP Visa Example #define E8491 VXI00INSTRUnsigned char ViClosefw E8491 Error handling function Storing Readings Shared Memory Sicl Example Ivxirminfoe8491, 0, &info startaddr = info.memstart Comments Ieee 1394 Fundamentals Interface Overview Ieee 1394 Topology and TerminologyFeatures of the Ieee 1394 Bus Terms shown in -1 are defined in the following tableOptimizing the Configuration Ieee Data Transfer ProtocolIeee 1394 Fundamentals and Interface Overview Chapter Adaptec AHA-8940 Host Adapter Interface Cable HP E8491A PC to VXI Interconnect PIN #Configuration Label Using the HP E8491A With the HP E1406 Command Module HP IO LibrariesInterface Characteristics VXI Characteristics GeneralExternal Trigger Output CLKExternal Trigger Input Cooling Trigger DelaysPower Supply Loading Specifications Appendix a Editing the HP E8491A Resource Manager Configuration Configuration File OverviewPage Page Page Using ivxisc Utility Function OverviewPage Iclear Sicl interface name, logical address Page Index MXI Trig In specifications Index