How to solve tgInitAsTarget response problem with ACR122U-A9?

问题

I am working over emulating ndef tags with acr122U device(PN532 chip). My start point was the question at How to card emulate with ACR122U-A9. I can manage device (I can change led or buzzer states) with direct commands. But could not get a response from device when I pass tgInitAsTarget command. There is no an error, I am getting empty response when I pass tgInitAsTarget.

I am working over an windows 10 machine with Java, the acr122u firmware is ACR122U215 version.

Here is my commands and responses:

Read registers
<< FF 00 00 00 08 D4 06 63 05 63 0D 63 38 
>> D5 07 07 00 05 90 00 

Write registers
<< FF 00 00 00 11 D4 08 63 02 80 63 03 80 63 05 07 63 0D 00 63 38 05 
>> D5 09 90 00 

Set parameters
<< FF 00 00 00 03 D4 12 30 
>> D5 13 90 00 

tgInitAsTargetCommand
<< FF 00 00 00 27 D4 8C 05 04 00 12 34 56 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
>>      

There should be a response, but I could not get response, and I wonder what is wrong?

tgInitAsTargetCommand
<< FF 00 00 00 27 D4 8C 05 04 00 12 34 56 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
>>          //??Why could not I get response?         

来源：https://stackoverflow.com/questions/55986533/how-to-solve-tginitastarget-response-problem-with-acr122u-a9