Decoding

Is that POS as in Point-of-Sales?

Have you contacted the manufacturer?

Note that POS protocols are often intended to be non-readable for the simple reason that they do not want people to be able to skim credit card information.

Decoding - or possibly "cracking" protocols is something that normally requires access to many messages and normally also some knowledge about what information may have been sent in a message.

Storing your 15 bytes into a binary file, a number of binary editors will allow you to view the data in a number of ways - as BCD, 8-bit, 16-bit, 32-bit, 64-bit, byte-reversed, 4-byte FP, 8-byte FP, ...

The thing here is that if you do mean point-of-sales, then you don't need to know the contents unless you are implementing one of the end points - the POS equipment in the store, or the receiver at the opposite end. Any transfer media in between do not need to care - and isn't expected to know - about the contents of messages. They are expected to be transparent modems.

Is that POS as in Point-of-Sales?

Have you contacted the manufacturer?

Note that POS protocols are often intended to be non-readable for the simple reason that they do not want people to be able to skim credit card information.

Decoding - or possibly "cracking" protocols is something that normally requires access to many messages and normally also some knowledge about what information may have been sent in a message.

Storing your 15 bytes into a binary file, a number of binary editors will allow you to view the data in a number of ways - as BCD, 8-bit, 16-bit, 32-bit, 64-bit, byte-reversed, 4-byte FP, 8-byte FP, ...

The thing here is that if you do mean point-of-sales, then you don't need to know the contents unless you are implementing one of the end points - the POS equipment in the store, or the receiver at the opposite end. Any transfer media in between do not need to care - and isn't expected to know - about the contents of messages. They are expected to be transparent modems.

Hello,

Actually I want to know if last five sets are store number and I want to see if it is then does it match to my store number. POS is point of sales from PAR and I am trying to install program at different stores with different store number to unlock function menu. If I use above FEF code with my store number then it works but if I change store number in POS to different then it wont allow me to use that function menu. So I want to change last five sets of hex to specific store number for each store. Thanks

So you should obviously be asking PAR, then!

Sounds like only one store number is authorized.

"Sounds like only one store number is authorized."

We don't even know for sure if there is a "store number" in that data!

This really is something that needs to be confirmed with the manufacturer!

Related Links:

http://www.keil.com/forum/docs/thread15756.asp
http://www.keil.com/forum/docs/thread15769.asp
http://www.keil.com/forum/docs/thread15770.asp

So, the situation is:
only one store number is authorized;
And, you want deploy the integrated credit card payment system to every store.

See: http://www.keil.com/forum/docs/thread15770.asp#msg79978