3. AIRSTEP’s Interfaces
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<h4>5-Pin MIDI output interface</h4>
<p>Use a standard 5-pin MIDI cable to connect to the controlled device. Each output interface can be specified to output different MIDI messages.</p>
<h4>Relay output interface</h4>
<p>A total of 4 Relay output interfaces are included. Relay is also named “external footswitch”, can be used as a traditional foot switch with amps and stompboxes with FS jack. As long as your devices can be connected to a traditional foot switch, they can all be connected here.</p>
<p>Relay output can be set to momentary or latching, which can be adapted to most devices.
For connecting your controlled device through the TRS line or TS line, please refer to the manual of the controlled device for the specific line used. If you are unsure, you can also confirm the message type by stepping on 5 footsteps by the factory default preset 5 "External footswitch".</p>
<h4>Relay line sequence</h4>
<p>Relay 1,2, corresponding to the tip and ring of Relay's general interface 1. Relay 3, 4, corresponding to the tip and ring of Relay's general interface 2.</p>
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<h4>USB interface</h4>
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<p>The USB interface can send and receive MIDI messages. It can work in device mode (USB Device) or host mode (USB Host). The default is the device mode, if you connect the OTG cable attached to the AIRSTEP, it will work in the host mode.</p>
<p>When connecting to computer, please use USB cable in the accessories to connect. When connecting with MIDI keyboard or ZOOM MS series, please use the attached OTG cable to connect. At this time, the USB works in host mode (USB Host). In host mode, USB supplies power to external devices, and the power supply current cannot exceed 150mA.</p>
<p>When the USB is successfully connected to an external device, the USB Indicator lights up.</p>
<h4>5-Pin MIDI input interface</h4>
<p>To receive MIDI messages sent by external devices, use standard 5-pin MIDI cable connect to external devices.</p>
<p>All MIDI messages received by this interface can be forwarded to any MIDI output interface, including Bluetooth, USB, and traditional MIDI output interfaces. You can also use the unique trigger function to translate specific MIDI messages received to any messages that AIRSTEP supports.</p>
<h4>Expression pedal interface</h4>
<p>Support all types of expression pedals (TRS type or RTS type), select the expression pedal type in the APP, TRS cable should be used to connect.</p>
<h4>External Antenna</h4>
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<p>The external antenna is used for wireless Bluetooth communication with mobile computers or AIRSTEP Lite. AIRSTEP sends or receives MIDI messages and also sends HID messages via Bluetooth.</p>
<p>The antenna can be rotated to adjust the direction. When it is perpendicular to the ground, it means the best performance and the longest communication distance.</p>
<h4>Charging interface</h4>
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<p>It should be connected to 5-9V DC power supply for charging, positive outside and negative inside. You can connect the supplied charging cable to a power supply with a USB port (such as a mobile phone charger), or you can connect a normal 9V stomp box power supply.</p>
<p>While charging, the red indicator light next to it lights up. When fully charged, the indicator lights green. The maximum charging current is 500mA.</p>
<h4>Power Switch</h4>
<p>Turn up to turn on the power, and turn down to turn off the power. Turn off the power when not in use to save power.</p>
<h4>Multi-function button</h4>
<p>Short press to cycle through 5 local presets. Long press to bring up the on-screen keyboard (when the on-screen keyboard of the iOS device is hidden).</p>
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<h4>Footswitch</h4>
<p>5 footswitches A, B, C, D, E. Each footswitch can set 3 trigger modes: press, release, and long press. A single trigger can send up to 8 different messages, including MIDI messages, HID messages, and Relay messages.</p>
<h4>Footswitch indicator</h4>
<p>Each indicator can be set to 2 indication modes, normal mode and toggle mode. In normal mode, only the indicator that is currently triggered will light up. In the toggle mode, the Footswitch indicator lights up when triggered for the first time, and turns off when the Footswitch indicator is triggered for the second time.</p>
<p>Five Footswitch indicators are also used to indicate the current local preset position. When switching between local presets, the corresponding indicator will flash green to remind you of the local preset position. From left to right, they represent local preset positions 1-5 respectively.</p>
<h4>Connection indicator</h4>
<p>The connection indicator is used to indicate the Bluetooth connection status. Steady light means connected, flashing means not connected.</p>