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E1459A/Z2404B User and SCPI Programming Guide
B
Keysight E1459A Register
Definitions
Overview
The Keysight E1459A Isolated Digital Input/Interrupt module is a register-based
slave device. There are 64 isolated inputs which can be used for detecting rising
and/or falling edges independently. Each 16 channels has a set of registers used
to define the detection of interrupt conditions. Listed below are the different
register types on this module.
– ID Register - Identifies Keysight as the manufacturer, and that the card is
an A16 register based device.
– Device Type Register - Identifies card as a Keysight E1459A.
– Status/Control Register - When read it returns device specific status
information. When written it to, it sets control bits. Bit 4 specifies the
registers for the upper or lower 32 channels.
– Edge Interrupt Status Register - This register indicates which Port has
detected an edge interrupt.
– Data Available Status Register (DAV) - This register indicates which
register has been externally triggered and has data available.
– Watchdog Timer Control/Status Register - The watchdog timer on the
module is enabled and pet using this register.
– Command Register - There are two of these registers, each controls two
ports; used to control triggering and enabling interrupts.
– Channel Data Register - There are four of these registers, one for each
port; these registers contain the current channel data.
– Positive Edge Detect Register - There are four of these registers, one for
each port; used to capture transitions from low to high levels.
– Negative Edge Detect Register - There are four of these registers, one for
each port; used to capture transitions from high to low levels.
– Positive Mask Register - There are four of these registers, one for each
port; these registers enable data to be captured in the Positive Edge
Detect Registers.
– Negative Mask Register - There are four of these registers, one for each
port; these registers enable data to be captured in the Negative Edge
Detect Registers.
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