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Zebra TC21 Product Reference Guide

Zebra TC21
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Data Capture
72
Scanning Considerations
Typically, scanning is a simple matter of aim, scan, and decode, with a few quick trial efforts to master it.
However, consider the following to optimize scanning performance:
•Range: Scanners decode best over a particular working range — minimum and maximum distances
from the barcode. This range varies according to barcode density and scanning device optics. Scan
within range for quick and constant decodes; scanning too close or too far away prevents decodes.
Move the scanner closer and further away to find the right working range for the barcodes being
scanned.
•Angle: Scanning angle is important for quick decodes. When the illumination/flash reflects directly back
into the imager, the specular reflection can blind/saturate the imager. To avoid this, scan the barcode
so that the beam does not bounce directly back. Do not scan at too sharp an angle; the scanner needs
to collect scattered reflections from the scan to make a successful decode. Practice quickly shows what
tolerances to work within.
Hold the device farther away for larger symbols.
Move the device closer for symbols with bars that are close together.
NOTE: Scanning procedures depend on the app and device configuration. An app may use different
scanning procedures from the one listed above.
Scanning with Internal Imager
To read a barcode, a scan-enabled app is required. The device contains the DataWedge app that allows
the user to enable the imager, decode the barcode data, and display the barcode content.
To scan with the internal imager:
1. Ensure that an app is open on the device and a text field is in focus (text cursor in text field).
2. Point the exit window on the top of the device at a barcode.
3. Press and hold the scan button.
The red laser aiming pattern turns on to assist in aiming.

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Zebra TC21 Specifications

General IconGeneral
Display diagonal5 \
Touch technologyMulti-touch
Touchscreen typeCapacitive
Display resolution1280 x 720 pixels
Battery capacity3100 mAh
Battery life (max)10 h
Battery recharge time (off)4 h
Flash memory32 GB
Internal memory3 GB
Internal memory type-
Compatible memory cardsMicroSD (TransFlash), MicroSDHC, MicroSDXC
Maximum memory card size128 GB
Wi-Fi standards802.11a, 802.11b, 802.11g, Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac)
Bluetooth version5.0
Security algorithmsEAP-PWD, EAP-PEAP, EAP-TLS, EAP-TTLS, LEAP, MSCHAPv2, WEP, WPA, WPA-AES, WPA-TKIP, WPA2, WPA2-AES, WPA2-TKIP
Rear camera resolution (numeric)13 MP
USB 2.0 ports quantity1
RFID readerNo
Scanner type1D/2D
CertificationRoHS 2011/65/EU; 2015/863 REACH SVHC 1907/2006
Product colorBlack
International Protection (IP) codeIP67
SpeakersMono
Operating system version10
Operating system installedAndroid
Number of cores8
Processor model660
Processor familySnapdragon
Processor frequency1.8 GHz
Processor manufacturerQualcomm
Storage temperature (T-T)-30 - 70 °C
Operating temperature (T-T)-10 - 50 °C
Operating relative humidity (H-H)5 - 95 %
Harmonized System (HS) code84713000
Weight and Dimensions IconWeight and Dimensions
Depth13.7 mm
Width79 mm
Height158 mm
Weight236 g

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