diff --git a/doc/采集端通信协议规范.pdf b/doc/采集端通信协议规范.pdf
new file mode 100644
index 0000000..94fce5e
Binary files /dev/null and b/doc/采集端通信协议规范.pdf differ
diff --git a/prj/TCPClient/Debug/mini212g2.h b/prj/TCPClient/Debug/mini212g2.h
index 0588c4f..2a91d24 100644
--- a/prj/TCPClient/Debug/mini212g2.h
+++ b/prj/TCPClient/Debug/mini212g2.h
@@ -7,7 +7,7 @@
  * Set to 1 to use USART3 (PB10=TX PB11=RX) for sensor communication.
  * This steals the debug printf port — use JTAG debugger for observation.
  * Set to 0 for normal operation (USART2 / PA2+PA3). */
-#define SENSOR_USE_USART3    1
+#define SENSOR_USE_USART3    0
 
 /* Set to 1 to enable UART commands to configure sensor at boot.
  * Set to 0 if sensor is pre-configured via USB to auto-output CMOS/DVP.