Help on PPS command

Hi ,
I dont know whether this is the right place to post this or not. I am having a doubt on PPS message response . PPS stands for Protocol Parameter Selection.
The ATR I am getting for a contact card is 3B E9 00 00 81 31 FE 45 4A 43 4F 50 31 30 56 32 32 A3
Which says
3B: stands for Direct convention [format character]
And the Interface bytes fallowing format bytes are,
E9 :says TB1 ,TC1,TD1 will be fallowing E9.
00: TB1, 00:TC1
TD1:81 which says protocol selected for communication is T=1 and TD2 is the next interface byte.
TD2=31 , TA3 = FE, TB3 = 45.
History Bytes: 4b 43 4F 50 31 30 56 32 32
TCK = A3
From this ATR we can say TA2 is absent ,so it's possible to select the transmission parameter in the negotiable mode.
I want to know if I send a PPS [Protocol parameter selection ] to select T = 0 can card is able to switch to T=0.
So that I require to use T= 1 only for sending PPS message.
We are designing our on reader with some embedded controller. So in that situation it's difficult to have T=1 for all commands.

kishansaralaya wrote:
Hi ,
I dont know whether this is the right place to post this or not. I am having a doubt on PPS message response . PPS stands for Protocol Parameter Selection.
The ATR I am getting for a contact card is 3B E9 00 00 81 31 FE 45 4A 43 4F 50 31 30 56 32 32 A3
Which says
3B: stands for Direct convention [format character]
And the Interface bytes fallowing format bytes are,
E9 :says TB1 ,TC1,TD1 will be fallowing E9.
00: TB1, 00:TC1
TD1:81 which says protocol selected for communication is T=1 and TD2 is the next interface byte.
TD2=31 , TA3 = FE, TB3 = 45.
History Bytes: 4b 43 4F 50 31 30 56 32 32
TCK = A3
From this ATR we can say TA2 is absent ,so it's possible to select the transmission parameter in the negotiable mode.Well, you're also missing TA1, which specifies Fi/Di = reader frequency divider. You're stuck with 372. At 3.57 MHz this would be 9600 baud.
I want to know if I send a PPS [Protocol parameter selection ] to select T = 0 can card is able to switch to T=0.Where did you get the idea you can switch between T=0 and T=1. The only thing negotiable is the transmission speed.
So that I require to use T= 1 only for sending PPS message.PPS is independent of T=0 or T=1. How can it be dependant? In the PPS is stated what protocol will be used.
We are designing our on reader with some embedded controller. So in that situation it's difficult to have T=1 for all commands.What's the problem with T=1? It is much simpler than T=0. I hate this protocol.

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