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Note For compliance with European EMC standards EN 55011 and
EN 50082-1, backplane connector shields are included with each
HP E1429A/B digitizer ordered. The shields need only be installed in the
VXI mainframe if it is necessary to comply with these standards.
Addressing the
Digitizer over HP-IB
Devices in the Series C mainframe and in the servant area of the HP E1406
Command Module are located by an HP-IB address. The HP-IB address is a
combination of the controller’s interface select code, the Command
Module’s primary HP-IB address, and the device’s secondary HP-IB
address. An address in this form appears as:
70905
Interface Select Code (7): Determined by the address of the HP-IB
interface card in the controller. In most Hewlett-Packard controllers, this
card has a factory set address of 7, including the HP 82335 HP-IB Interface
Card (this card was used with an HP Vectra AT compatible personal
computer to create the C programs on the example programs disk).
Primary HP-IB Address (09): This is the address of the HP-IB port on the
Command Module. Valid addresses are 0 to 30. The Command Module has
a factory set address of 9.
Secondary HP-IB Address (05): This address is derived from the logical
address of the digitizer by dividing the logical address by 8. Thus, for the
HP E1429A/B digitizer factory set logical address of 40, the secondary
address is 05.
Addressing the
Digitizer using an
Embedded
Controller
As a message-based device, the HP E1429A/B digitizer can easily be
programmed across the VXIbus backplane from a HP E1499A V/382
embedded controller. The select code of the VXI interface board in
embedded controllers is typically 16. Since no secondary HP-IB address is
required when programming over the backplane, the logical address of the
HP E1429A/B digitizer is combined with the VXI interface select code:
1640 (for device logical address 40; range = 01 to 99)
If the digitizer’s logical address is changed to a value greater than 99, the
address becomes:
160xxx
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