Recording Experimental Signals > Creating Stimulus Protocols > Analog & Digital Output Channels
Analog Outputs (AO): Select the number of analog output channels to be used in the analog outputs No. Channels list.
For each AO channel defined, select the type of stimulus (Voltage or Current) and the stimulus units in the Stimulus Type list.
Digital Outputs (DO): Select the number of digital output channels to be used in the digital outputs No. Channels list.
(Note, during execution of a stimulus protocol, the analog and digital holding levels override the default holding levels set in the Seal Test or Default Settings windows).