DAC

Control DAC (Digital-to-Analog Converter) output on your device. The DAC command sets a precise analog voltage on a DAC net, useful for generating reference voltages, bias signals, or test stimuli.

Syntax

lager dac [OPTIONS] NET [VOLTAGE]

Global Options

Option	Description
`--box TEXT`	Lagerbox name or IP address
`--help`	Show help message and exit

Arguments

NET - Name of the DAC Net to control
VOLTAGE - Voltage value in volts to output

Supported Hardware

Manufacturer	Model	Channels	Output Range	Resolution
LabJack	T7	2 (DAC0-DAC1)	0 to 5 V	16-bit
Measurement Computing	USB-202	2 (DAC0-DAC1)	0 to 5 V	12-bit

Channel Naming

When creating DAC nets, the channel name depends on the hardware: LabJack T7: DAC0, DAC1, or numeric 0, 1 MCC USB-202: DAC0, DAC1, AOUT0, AOUT1, or numeric 0, 1

Default Net

Set a default DAC net to avoid specifying the name each time:

lager defaults add --dac-net VOLTAGE_OUTPUT

Then:

lager dac 3.3

Examples

# Set DAC output to 3.3V
lager dac VOLTAGE_OUTPUT 3.3 --box my-lager-box

# Set DAC output to 5.0V
lager dac POWER_RAIL 5.0 --box my-lager-box

# Set DAC output to 1.8V
lager dac REFERENCE_VOLTAGE 1.8 --box my-lager-box

# Set DAC output to 0V
lager dac SIGNAL_GENERATOR 0.0 --box my-lager-box

Troubleshooting

Issue	Cause	Fix
Output stuck at 0V	Net not configured or wrong channel	Verify net configuration with `lager nets --box <box>`
Voltage inaccurate	Resolution limit or load effects	Both LabJack T7 and USB-202 output 0-5V; verify your circuit doesn’t draw too much current from the DAC output
”Net not found”	Typo or net not created	Check available nets with `lager nets --box <box>`. Net names are case-sensitive.

Notes

Net names (e.g., VOLTAGE_OUTPUT, POWER_RAIL) refer to names assigned when setting up your testbed
Voltage values are specified in volts
Only works with nets of type dac
Ensure the target box has DAC nets properly configured
DAC outputs provide precise voltage control for analog circuits
Both supported hardware models output 0-5V
USB-202 channels can be specified as 0-1, DAC0-DAC1, or AOUT0-AOUT1

Lager Box Management

Configuration

Power & Simulation

Measurement

I/O & Communication

Development

Utilities

Syntax

Global Options

Arguments

Supported Hardware

Channel Naming

Default Net

Examples

Troubleshooting

Notes

See Also

​Syntax

​Global Options

​Arguments

​Supported Hardware

​Channel Naming

​Default Net

​Examples

​Troubleshooting

​Notes

​See Also

Syntax

Global Options

Arguments

Supported Hardware

Channel Naming

Default Net

Examples

Troubleshooting

Notes

See Also