DIO Tab¶

The DIO tab provides access to the settings and controls of the digital I/O as well as the Trigger channels and is available on all HF2 Series instruments.

Features¶

Monitor and control of digital I/O connectors
Control settings for external reference and triggering

Description¶

The DIO tab is the main panel to control the digital inputs and outputs as well as the trigger levels and external reference channels . Whenever the tab is closed or an additional one of the same type is needed, clicking the following icon will open a new instance of the tab.

Table 1: App icon and short description
Control/Tool	Option/Range	Description
DIO		Gives access to all controls relevant for the digital inputs and outputs including DIO, Trigger Inputs, Trigger Outputs, and Marker Outputs.

The Digital I/O section provides numerical monitors to observe the states of the digital inputs and outputs. Moreover, with the values set in the Output column and the Drive button activated the states can also be actively set in different numerical formats.

With the Sync Bit 1,0 setting it’s possible to activate a TTL synchronization signal on one of the DIO BNC connectors on the instrument back panel.

Functional Elements¶

Table 2: Digital input and output channels, reference and trigger
Control/Tool	Option/Range	Description
QA Result Overflow	grey/yellow/red	Red: present overflow condition on the DIO interface during readout. Yellow: indicates an overflow occurred in the past. An overflow can happen if readouts are triggered faster than the maximum possible data-rate of the DIO interface.
DIO bits	label	Partitioning of the 32 bits of the DIO into 4 buses of 8 bits each. Each bus can be used as an input or output.
DIO input	numeric value in either Hex or Binary format	Current digital values at the DIO input port.
DIO output	numeric value in either hexadecimal or binary format	Digital output values. Enable drive to apply the signals to the output.
DIO drive	ON / OFF	When on, the corresponding 8-bit bus is in output mode. When off, it is in input mode.
Format		Select DIO view format.
	Hexadecimal	DIO view format is hexadecimal.
	Binary	DIO view format is binary.
Clock		Select DIO internal or external clocking.
	Internal 64 MHz	The DIO is internally clocked with a fixed frequency of 64 MHz.
	Clk Pin 68	The DIO is externally clocked with a clock signal connected to DIO Pin 68. Available frequency range 1 Hz to 64 MHz.
Sync Bit 1		Select a demodulator reference signal to be applied on DIO 1.
	Off	DIO output 1 (BNC connector) is not used for sync output and is free for other purposes.
	Demod 1 to 8	Reference signal of the selected demodulator is output on DIO 1. Note: there is a 166 ns delay between the sync on DIO 1 and the front panel outputs (sync on DIO 1 comes first) which leads to a relevant phase shift at high frequencies.
Sync Bit 0		Select a demodulator reference signal to be applied on DIO 0.
	Off	DIO output 0 (BNC connector) is not used for sync output and is free for other purposes.
	Demod 1 to 8	Reference signal of the selected demodulator is output on DIO 0. Note: there is a 166 ns delay between the sync on DIO 0 and the front panel outputs (sync on DIO 0 comes first) which leads to a relevant phase shift at high frequencies.
Delay (s)		This delay adds an offset that acts only on the trigger/marker output. The total delay to the trigger/marker output is the sum of this value and the value of the output delay node.