Lector grabador Elatec MultiTech 2 TWN4 T4BT-FB2BEL2

Este lector es infield actualizable y tiene un poderoso SDK para escribir aplicaciones que se ejecutan directamente en el lector.

Lector de escritorio Cable USB 2.0m Antena integrada de 125kHz y 13.56MHz

Tenga en cuenta que la gama completa de lectores de tarjetas TWN4 es compatible con todas las tarjetas HID y también leen / escriben datos cifrados con las opciones P y I.

Peso del producto: 0,50 kg.

INSTRUCCIONES DE CODIFICACIÓN Mifare 1K:

>> They just want to write data to a sector... 
They can write data to sector/block using MifareClassic_WriteBlock function. They can test it in Director tool. See attached screenshot - I have written all 0's in Block 4 (1st Block of Sector 1). Please note that only first 3 Blocks of a Sector are Data Blocks.

In order to use Director they need to upload the Simple Protocol Firmware on the reader  (from our DevPack). 

>> ... , and set a custom key for that sector with your reader.
In order to change the key they need to write into the 4th block of sector (this block is called sector trailer). This block is organized like this: KEYA (6bytes) + Access Conditions (4bytes) + KEYB(6bytes)

Here is example of my card and Sector trailer for Sector 1 (Block 7)
MifareClassic_ReadBlock(0x07) | Result: true | Data: 000000000000FF078069FFFFFFFFFFFF | 

KeyA is not visible (cannot be read) so it's always shown as all 0's, but indeed it's all F's.

So, in order to change key you need to write in this block. In order to change KeyA you need to modify only fist 6 bytes, and copy rest 10 bytes (access condition bytes and KeyB). Attached is example where I changed KeyA from all F's to A0A1A2A3A4A5.