1. DS4678 Product Reference Guide
  2. Radio Communications
  3. Virtual Tether
  4. Virtual Tether Alarm Considerations
  • DS4678 Product Reference Guide
Virtual Tether Alarm Considerations

Virtual Tether Alarm Considerations

There are many causes for an alarm to activate or not activate. It is also important to know the effects of Battery Preservation mode and Night mode.
Causes for the alarm to activate
  • Device going out of range. Depending on configuration, both scanner and cradle can alarm if connection between them is broken due to one of the devices going out of range.
  • If cradle is unpowered, the scanner sounds the alarm. Includes USB suspend of the cradle.
  • Removing battery from the scanner will cause the cradle to sound the alarm.
Causes for the alarm to not activate
  • Scanner and cradle need to have an existing connection before alarm activates. No alarm on power up.
  • If the scanner is charging in or paired to another cradle/host by insertion or by scanning the pairing bar code, since it presumed that in this case the scanner is not lost.
  • If another scanner connects to the cradle and causes the original scanner to disconnect.
  • If any of the batch modes are enabled or if auto-reconnect is NOT set to reconnect immediately.
  • Virtual Tether does not apply to the hosts that do not support auto-reconnect feature such as HID Bluetooth Low Energy (Discoverable) and SPP BT Classic (Discoverable).
  • Alarm is not activated if the disconnection occurs due to firmware update or configuration via 123Scan or SMS.
  • If scanner is connected to another cradle/host by insertion or by scanning the pairing barcode.
Battery Preservation Mode
If the scanner disconnects from the cradle due to the activation of the Battery Preservation Mode and the Virtual Tether Alarm on the cradle is enabled, only the LEDs on the cradle blink green and red.
If Virtual Tether is enabled and a power outage occurs that causes multiple cradles or Bluetooth hosts to lose power, it activates alarms on the scanners paired to them. A trigger pull can be configured to defeat the alarm (see Defeat Virtual Tether Alarm) The alarms can also be defeated by either disconnecting the battery from the scanner or by pairing the scanner to another cradle or host that has power if one is available.