1400 Series Audio-Nav Keypad
Technical Manual
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1400 Series Audio-Nav Technical Manual Rev 1.5 www.storm-interface.com Page 2 of 39
Product Features
This keypad is an Accessibility Module to provide enhanced capabilities to allow the operation of OEM equipment
by people with visual impairment or disability. A key feature of the module is that it provides compliance as far as is
practicable with various country standards for equipment use by disabled people, including the Americans with
Disabilities Act (ADA – USA) and the Disabilities Discrimination Act (DDA – EUR)
This provides a set of menu selection keys which are differentiated in a way that makes use by people with visual
or tactile impairment easier. In addition, a standard 3.5mm headphone socket is provided. This allows customers to
plug their headset into the module and receive audio instruction to help them navigate the use of the equipment.
The audio output is stereo via a 3.5mm jack socket – transmits a USB code on jack insert & remove.
The following function keys are provided:
• A 4 way directional key providing UP, DOWN, LEFT and RIGHT cursor control
• A central ENTER key
• An audio VOLUME key. This is illuminated with a tactile symbol and a printed legend tile under the keycap
The tile and keycap are supplied loose, so that the keycap can be fitted in the preferred orientation.
An orientation switch is provided so that the keypad
can be fitted in portrait or landscape orientation.
This sends a USB code to the host : factory default is landscape
(Landscape = switch position I shown in picture )
The keypad is designed to be installed underpanel onto M3 weld studs.
Download CAD File for panel cutout drawing.
It is recommended to use a cable tie for strain relief on the USB cable.
(Use 2.5mm nylon cable tie, RS 233-402 or equivalent)
USB Connection
The keypad is powered via a mini-USB socket. Streaming digital audio is provided by an isochronous USB channel
and the device numerates as a standard audio device/HID keyboard/HID compliant composite device under
Windows 7 or Windows 7 POS ready. The key presses will be sent to HID keyboard, HID input/output descriptor
(e.g to control LED) is be sent over the HID compliant device channel and the audio over the audio device
channel. There will be no additional drivers required since Windows 7 supports as standard streaming audio and
HID devices.
USB Codes
The USB codes can be changed; either with the Configuration Utility, or from a host application by using the API.
Three selectable keycode tables are stored in memory and it is possible to select the desired code table via API.
The selectable tables are: -
Factory Default
Alternate Table The up/down keys will act as HID consumer controlled keys for vol up & vol down.
Customised Table Any key can have any USB keycode assigned, including modifiers
Illumination
This can be set to on or off (or can be dimmed)
