Chapter 1

Installing and Configuring the HP E1459A

The HP E1459A 64-Channel Isolated Digital Input/Interrupt module (formerly known as the HP Z2404B1) 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).

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 1-1shows the functional block diagram for the module.

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.

Installing and Configuring the HP E1459A 11