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Installing and Configuring the HP E1459A 11
Chapter 1
Installing and Configuring the HP E1459A
The HP E1459A 64-Channel Isolated Digital Input/Interrupt module
(formerly known as the HP Z2404B
1
) provides 64 isolated digital input
channels configured as four 16-bit ports. The module is used for sensing
signals and detecting edge changes on digital inputs. The module is a C-Size
VXIbus register-based product that operates in a C-Size VXIbus mainframe.
Each isolated channel can withstand up to 115 Vac RMS or 115 Vdc
difference in ground potential between channels. The input threshold for
each channel is selectable with a jumper to allow for inputs with high logic
levels from 5 to 48 volts. Each channel can be individually masked to
generate an interrupt on a positive and/or negative edge transition. Channel
inputs are also "debounced" to help prevent erroneous transition detection
on noisy signals. Two programmable clock sources control the debounce
circuitry (one for ports 0 and 1, one for ports 2 and 3).
1. The HP E1459A and Z2404B are functionally identical. The HP E1459A is provided with a downloadable
SCPI driver and a VXIplug&play driver; the HP Z2404B was not provided with a language driver.
Functional Description
The HP E1459A simultaneously monitors each channel for the occurrence
of transitions, (i.e., edge events), or for level sensing signals which meet
preprogrammed parameters for magnitude and duty. Each channel is
electrically isolated from all other channels, power, ground, and other
current paths within the limits of specification. Each channel may be
independently programmed to sense only positive transitions, only negative
transitions, or transitions of either polarity.
Figure 1-1 shows the functional block diagram for the module.