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 MFLI 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

btn mnu dio um

Gives access to all controls relevant for the digital inputs and outputs including the Ref/Trigger connectors.

functional dio
Figure 1. LabOne UI: DIO tab

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.

The Trigger section shows the settings for the 2 trigger inputs and 2 trigger outputs on the instrument back panel. The trigger outputs can be referenced to the demodulator frequencies and output a TTL signal with a 50% duty cycle.

The Input Level determines the trigger threshold for trigger state discrimination. Also a 100 mV hysteresis is applied that cannot be adjusted such that a minimum amplitude of more than 100 mV is needed for the Trigger inputs to work reliably.

Functional Elements

Table 2. Digital input and output channels, reference and trigger
Control/Tool Option/Range Description

DIO mode

Select DIO mode

Threshold outputs

Enables setting of DIO output values by the threshold unit.

Manual

Enables manual control of the DIO output bits.

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 60 MHz

The DIO is internally clocked with a fixed frequency of 60 MHz.

Clk Pin 68

The DIO is externally clocked with a clock signal connected to DIO Pin 68.

Available frequency range 1 Hz to 60 MHz.

Trigger level

-5 V to 5 V

Trigger voltage level at which the trigger input toggles between low and high. Use 50% amplitude for digital input and consider the trigger hysteresis.

Auto Threshold

Press once

Automatically adjust the trigger threshold. The level is adjusted to fall in the center of the applied transitions.

Trigger Input Low status

Indicates the current low level trigger state.

Off

A low state is not being triggered.

On

A low state is being triggered.

Trigger Input High status

Indicates the current high level trigger state.

Off

A high state is not being triggered.

On

A high state is being triggered.

Trigger output signal

Select the signal assigned to the trigger output.

Off

The output trigger is disabled.

Osc Phase Demod 2/4

Oscillator phase of demod 2 (trigger output channel 1) or demod 4 (trigger output channel 2). Trigger event is output for each zero crossing of the oscillator phase.

Scope Trigger

Trigger output is asserted when the scope trigger condition is satisfied.

Scope /Trigger

Trigger output is deasserted when the scope trigger condition is satisfied.

Scope Armed

Trigger output is asserted when the scope is waiting for the trigger condition to become satisfied.

Scope /Armed

Trigger output is deasserted when the scope is waiting for the trigger condition to become satisfied.

Scope Active

Trigger output is asserted when the scope has triggered and is recording data.

Scope /Active

Trigger output is deasserted when the scope has triggered and is recording data.

Threshold 1

Threshold Logic Unit 1 output.

Threshold 2

Threshold Logic Unit 2 output.

Threshold 3

Threshold Logic Unit 3 output.

Threshold 4

Threshold Logic Unit 4 output.

MDS Sync Out

Trigger output is driven by the multi-device synchronisation signal.

Width

0 s to 0.149 s

Defines the minimal pulse width for the case of Scope events written to the trigger outputs of the device.