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5   Hardware lock to disable USB mass storage device

You can lock the VTAP50 so that its firmware and configuration cannot be changed.  You can 

either do this in software, or simply disable the mass storage device in hardware.

A software lock prevents changes but leaves some files visible. A hardware lock means that 

the VTAP50 will no longer be detected as a USB mass storage device. (It will still behave as an 

HID keyboard device and, if enabled, the virtual COM port will behave as a composite USB 

device consisting of HID keyboard and USB virtual COM port.)

You can use a hardware lock provided the jumper labelled LOCK (close to the 

MicroUSB connector) remains accessible on a VTAP50 OEM module.

 Note:

 On VTAP50 OEM modules, although the contact is present, connector pins and 

jumpers will need to be supplied.

Connect a jumper across LOCK on the PCB to lock the device, preventing firmware or 

configuration changes via the mass storage device. (It may still be possible to update the 

firmware or configuration via the command interfaces of the virtual COM port or serial ports, 

if they are enabled.)

Figure 5-1 Jumper positions on VTAP50 PCB v1 hardware

When you start the VTAP50, the presence of this jumper means the connected PC will not 

detect a USB mass storage device. The VTAP50 will only be detected by the PC as a keyboard 

(or keyboard and virtual COM port).

At any time you can remove the jumper across LOCK. When you restart the VTAP50, it will 

be detected as a USB mass storage device and you will be able to make firmware or 

configuration changes again.

VTAP50 OEM MODULE INSTALLATION GUIDE

PAGE 10

Summary of Contents for VTAP50

Page 1: ...VTAP50 OEM Module Installation Guide Revised June 2022 DRAFT v0 4...

Page 2: ...en please contact our support team The product is constantly being reviewed and improved and we value feedback about your experience Copyright 2022 Dot Origin Ltd All rights reserved No part of this I...

Page 3: ...le connection RS232 and USB 6 4 Module integration instructions 8 4 1 Applicable FCC rules 8 4 2 Specific operational use conditions 8 4 3 RF exposure considerations 8 4 4 Antennas 9 4 5 Label and com...

Page 4: ...IEC 62368 1 WARNING ESD PRECAUTIONS We recommend careful handling and storage of Electrostatic Sensitive Devices ESDs during installation The VTAP50 OEM module PCB should always be protected by static...

Page 5: ...ere is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning...

Page 6: ...Consult the VTAP100 Basic Configuration Guide for more about configuration and maintenance features including how to update the firmware on your VTAP50 unit when a new release is available The firmwa...

Page 7: ...ng any settings When the VTAP50 OEM module is connected to a computer it appears as a generic mass storage device like a memory stick To configure your VTAP50 you simply edit or create text files Thes...

Page 8: ...ts will be displayed in the open text editor l Your smartphone may signal with a buzz or beep Note Some Android phones will only interact if their screen is on although it does not need to be unlocked...

Page 9: ...the VTAP50 PCB 3 1 Power Connect the PCB to a PC using either a MicroUSB to USB cable or the optional captive cable see section 3 4 The VTAP50 is rated at 5V DC typ 110mA max 150mA for power over USB...

Page 10: ...s v1 Hardware The user s smartphone should be able to tap within 10mm of the antenna on the PCB The antenna position should be clearly marked and easily accessed so that users can position their smart...

Page 11: ...f the J1 connector on your PCB does not include a shroud to guide the matching wires into place you can use a wider range of mating connectors Do please take extra care to ensure your connecting cable...

Page 12: ...appropriate connecting cable is then a DCE data communications equipment female DB9 TXD and RXD pins are swapped between the DCE and DTE devices so that the transmit pin on one connects to the receiv...

Page 13: ...o the reader a person comes within 10mm of the device so the rules relating to portable transmitters apply 4 2 Specific operational use conditions The VTAP50 OEM module must be stored and operated und...

Page 14: ...emission levels or susceptibility in the VTAP50 OEM module 1 VTAP50 OEM module powered on Communicating with PC over USB Continuously reading tag 2 VTAP50 OEM module powered on and tag present but no...

Page 15: ...n VTAP50 OEM modules although the contact is present connector pins and jumpers will need to be supplied Connect a jumper across LOCK on the PCB to lock the device preventing firmware or configuration...

Page 16: ...or to ensure that when equipment containing a VTAP50 reaches the end of its life it is recycled in accordance with WEEE Regulations within the EU VTAP50 PCB and cables should not be disposed of in gen...

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