diff --git a/src/gd32e23x_it.c b/src/gd32e23x_it.c
index e767fb8..5bebbf2 100644
--- a/src/gd32e23x_it.c
+++ b/src/gd32e23x_it.c
@@ -147,5 +147,6 @@ void USART0_IRQHandler(void) {
         //     printf("%c%c%c%c", 0xB5, 0xF2, 0x00, 0xF2);
         //     // fflush(stdout);
         // }
+        rx_index = 0;
     }
 }
diff --git a/src/rs485.c b/src/rs485.c
index ee43096..618ab49 100644
--- a/src/rs485.c
+++ b/src/rs485.c
@@ -42,7 +42,7 @@ void rs485_config(void) {
 void process_command(uint8_t *cmd, size_t length) {
     char combined_str[3];
 
-    // printf("%d", length);
+    printf("%d", length);
 
     // validate_package_crc(cmd, length);
     // if (calculate_crc(cmd, length - 1) != cmd[length - 1]) {