diff --git a/src/main.rs b/src/main.rs
index e7a11a9..f465a71 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,13 @@
+use eskin_finger_sdk::{config::DeviceConfig, device::{EskinDevice, EskinDeviceInner}, transport::SerialPortTransport};
+
 fn main() {
-    println!("Hello, world!");
+    let transport = SerialPortTransport::new("/dev/ttyUSB0", 921600);
+    let config = DeviceConfig::default();
+    let mut device = EskinDeviceInner::new(config, Box::new(transport));
+    device.open().unwrap();
+
+    let data = device.read_register(0x1C00, 168).unwrap();
+    println!("Serial: {:?}", data);
+
+    device.close().unwrap();
 }
diff --git a/src/protocol.rs b/src/protocol.rs
index 24a2bda..b752fec 100644
--- a/src/protocol.rs
+++ b/src/protocol.rs
@@ -154,7 +154,7 @@ impl ProtocolCodec for EskinProtocolCodec {
 
         let crc = self.crc8(&frame);
         frame.push(crc);
-
+        println!("send: {:02X?}", frame);
         Ok(frame)
     }