User's Manual

WSDU User Manual February 8, 2019
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1. Introduction
The Wearable Scan and Display Unit (WSDU) is a purpose-built, extremely lightweight (less
than 150gm) wearable barcode scanner. It is used with the Manual Sortation Appliance (MSA)
and communicates with the MSA server via a 915MHz ISM band “wireless cable”
communications channel. The WSDU provides a base node with USB virtual COM port
capabilities for transmitting decoded barcode information as plain ASCII.
The barcode scanner within the WSDU is triggered by a 3-axis gyroscope accelerometer. The
WSDU detects the absence of movement by the WSDU operator’s arm, then initiates the
scanning, decoding and transmission of labeling information to the MSA. The movement
detection algorithm is designed to minimize false triggers to the extent possible to conserve
battery life of the WSDU.
Upon transmission of a successful barcode read, there is a beep acknowledgement by the
WSDU:
• All scans are acknowledged by a sound indicator: single chip beep for a successful
scan, double down-tone chip for a failed or no scan.
• A single high-pitched positive acknowledgement indicates that the MSA has received
and successfully processed the scan.
• A low pitched down-tone is a negative acknowledgement which indicates either the MSA
did not receive the scan or the scan requires some user attention—it might be a no
route, no result or bad barcode which did not result in a usable sort destination.
There are three buttons on the display: Blue, White and Red.
• Blue: On button; the Select button when in sub-menus
• White: Vol Down for audible control; Scroll Down when in sub-menus
• Red: Vol Up for audible control; Scroll Up keys when in sub-menus
Global motion movement along with the absence of in-motion triggering is implemented. The
WSDU is bilaterally neutral with respect to usability (handedness). The need for cumbersome
mounting schemes along with left-right hand device management is eliminated. The default
configuration is wearing the WSDU on the right wrist but it can easily be configured for wearing
on the left wrist via the left-hand wrist cuff strap.