Assign New IDs to RW1990 Programmable iButtons -Using Serial Port iButton ID Writer

The global unique serial number (ID) of an iButton is written into the chip by laser during manufacture. But now we have another way to assign new IDs to the RW1990 programmable iButtons using our serial port iButton ID writer and tm1990b programming software.

To make this job done, we need to prepare below items:

Below is a picture of a whole set of iButton ID writer set.

whole set of iButton ID writer/programmer set

The serial port ibutton ID writer and RW1990 writable ibuttons are available from our website as well as the programming software. The difficulty is the 8-bit CRC code of item 4 and it is very difficult to understand the calculation of CRC code for common users. Luckily we have tools or formula to generate the CRC given a 48-bit string and the family code. We now illustrate an online calculator name as CRC8 Calculator. All we need to do is input the ID (family code + 48-bit serial number) and then click ‘submit’ button on that link.

Take the 01 family code and 0123456789AB serial code for example, we input the string 010123456789AB on the calculator and click summit, then we get below output:

CRC8 Calculator

So the CRC code is 10 for the string 010123456789AB. The whole 64-bit serial ID number is 010123456789AB10.

Now back to process of assigning IDs by the programming software.

1. Launch the ibutton programming software as below(Please refer to Install iButton Copy Software TM1990B on Windows XP/7(32bit)/8(32bit)):

launch the ibutton writer/prgrammer software

2. Input the new ID on the box (or you can copy and paste 010123456789AB)

Input iButton ID Number with correct CRC code

3. Holding a RW1990 key on the blue dot receptor then click rdrom and the written id is show one the box (ROMID).

Click Write ROPM of the iButton programming software

4. Keep holding the RW1990 ibutton key and click ‘ROMReadContinue’, until the ‘START’ is selected on the ‘TIMER INTERVAL’ field.

the iButton ID writing process is complete

5. Now the process is complete. You can check with the ibutton by the OneWireViewer as below showing that now the ibutton has an ID (shown in reversed order) assigned by you.

New ID is shown on the onewireviewer

It is really simple and the writing process should be done in seconds with the ibutton ID writer and programmer software. But can we write an ID number with an incorrect CRC cod? Well actually you can write an inconsistent ID to rw1990 ibuttons mentioned by above steps and show as below (with CRC code 11 which is not correct):

Wirte ibutton IDs sucessfully with incorrect CRC code

The problem is that you can’t read at all by OneWireViewer(No IDs will be show on it, including the ID of the USB adapter since it detects the CRC code is wrong on the 1-Wire bus).

No iButton IDs was show on the onewireviewer

And when you click ‘readrom’ by the writer software you will receive a CRC Error as below:

CRC error generated by the ibutton writer software

 

 

About iBUTTON CC

iButton CC is an Integrated High-Tech Which Includes Development, Production, Distribute and Trade. We manufacture & supply iButton, Dallas keys, iButton readers and iButton probes. We offer Chinese domestic ones as well as products by Maxim Integrated. Take a visit to our website iBUTTON.CC for more product detail.

Copy iButton’s 64-Bit Serial Number from DS1990A/TM1990 to RW1990

iButton’s 64-bit Serial Number(also called ID) can be copied or cloned by TM1990B software for windows along with our iButton Reader for Universal Serial Port.

This artitcle focus on the copying process only. For copy software setup process please refer to Install iButton Copy Software TM1990B on Windows XP/7(32bit)/8(32bit).

 

TM1990 iButton key with 64bit serial number

RW1990 writable iButton key

Prepare a TM1990 key, a RW1990 key (above pictures) and an iButton reader for serial port with Blue Dot cable as below:

iButton reader for serial port with Blue Dot cable produced by ibutton.cc

First connect reader to serial port of the computer board as below shows:

serial port of the computer board

Now launch the program by the shortcut. (What is this about? Please refer to Install iButton Copy Software TM1990B on Windows XP/7(32bit)/8(32bit).)

ibutton copy software tm1990b execute file

Note: if shortcut does not show on desktop, then go to the installation directory to start it.

Default location: C:\Program Files\ICOWCN\tm1990b\tm1990B.exe

 

Then, the programmer shows as below:

iButton clone software overview

Note: For copy purpose, we only focus on the red column of the program.

Put a TM1990 key on the blue dot and keep holding it, then click “ROMRD”  and wait for the ID show in the first text box as follow:

copy ibutton from ds1990a to rw1990 step 1

Then click the “Write ROM”button  and wait until the ID show in the ROMID box as following:

copy ibutton from ds1990a to rw1990 step 2

Still keep the key holding in the Blue Dot then click “ROMReadContinu” and the START is selected as follow:

copy ibutton from tm1990a to rw1990 step 3

Now take off the TM1990 key from and put an RW1990 key on the Blue Dot. Now first click “Write Rom” and then click “ROMReadContinu” until the STOP box is selected as following:

copy ibutton from tm1990a to rw1990 step 4

Now the copy process in complete.

 

The RW1990 key now has the same ID as the TM1990 key as shown from 1-Wire Viewer as below:

ibutton copy complete with same id by 1-Wire Viewer

 

 

About iButton CC

iButton CC is an Integrated High-Tech Which Includes Development, Production, Distribute and Trade. We manufacture & supply iButton, Dallas keys, iButton readers and iButton probes. We offer Chinese domestic ones as well as products by Maxim Integrated. Take a visit to our website iButton.cc for more product detail.

 

 

Install iButton Copy Software TM1990B on Windows XP/7(32bit)/8(32bit)

iButton’s 64-bit Serial Number(also called ID) can be copied or cloned by TM1990B software for windows along with our iButton Reader for Universal Serial Port.

This artitcle focus on the software installation only. For copy process please refer to Copy iButton’s 64-Bit Serial Number from DS1990A/TM1990 to RW1990.

ibutton copy software tm1990b setup file

Setup file for TM1990B iButton copy software.

Note: tm1990b could be installed on Windows XP/Windows 7(32 bit)/Window 8(32 bit).

(1) Double click the setup file,

ibutton copy software tm1990b installation step 1

 

(2) Click “Next”.

ibutton copy software tm1990b installation step 2

(3) Select “I accept the terms in the license agreement”, click “Next”.

ibutton copy software tm1990b installation step 3

(4) Click “Next”.

ibutton copy software tm1990b installation step 4

(5) Select “Typical” then click “Next”,

ibutton copy software tm1990b installation step 5

 

(6) Click “Install”,

ibutton copy software tm1990b installation step 5

(7) Click “Finish”.

The shortcut will appear on the desktop.

ibutton copy software tm1990b execute file

Now the setup process complete.

 

 

About iButton CC

iButton CC is an Integrated High-Tech Which Includes Development, Production, Distribute and Trade. We manufacture & supply iButton, Dallas keys, iButton readers and iButton probes. We offer Chinese domestic ones as well as products by Maxim Integrated. Take a visit to our website iButton.cc for more product detail.