Can I use the Generic Command to send Commands from the EPC Class 1Gen2 Standard?

[MSchm.5]

Hello, 

I use the ST25RU3993-EVAL board software. 

I want to do some Tag settings. 

Can I use the Generic Command (Tag Settings) to send Commands from the EPC Class 1Gen2 Standard?

it is possible, is their any explanation how to enter the Command?

[Nick K]

Hi,

yes, you can use the Generic command to send any command defined in Gen2 and also proprietary command following the Gen 2 physical interface definition.

The Generic Command input mask has the following members

• Direct Command: Define if ST25RU3993 shall handle CRC processing or not. If not CRC must be generated upfront and verified afterwards manual. See section 2.2.3 of the ST25RU3993 Datasheet for further info
• Tx Data Bit Length: Define the number of bits transmitted
• Rx Data Bit Length: Define the number of expected bits to be received
• Append RN16: Define if RN16 (handle) shall be append automatically.
• Rx no resp time: Timeout until TAG has time to respond.
• Command Data: Data to be transmitted

By default the "Generic Command" section in the "Tag Settings" dialog has pre-configured a Gen2 Read command, reading the first word in TID memory from address 0. (see EPCglobal Gen2 Read command specification)

Cmd Read (8bit) | MemBank (2bit) | WordPtr (EBV=8bit here) | WordCount (8bit) | RN (8bit) | CRC (8bit)

11000010 | 10 | 00000000 | 00000001 | AUTO when tick "Append RN16" | AUTO when use Direct Command 0x90

= > 0xC2 80 00 40, Tx valid bits = 26

In the example for the TAG reply of the Read command you need then to decode according to the Gen 2 spec

Header (1bit) | Memory Word (16bit) | RN (16bit)

=> 33bits expected, CRC is handled automatically when using Direct Command 0x90