diff --git a/mtr.py b/mtr.py
new file mode 100644
index 0000000..9ddcce2
--- /dev/null
+++ b/mtr.py
@@ -0,0 +1,19 @@
+import otime
+import serial
+from time import sleep
+
+def dump_all(port):
+    mtr = serial.Serial(port, baudrate=9600, timeout=40)
+    # dump all command
+    mtr.write(b'/SA')
+    card_dumps = []
+    sleep(0.4)
+    while mtr.in_waiting > 0:
+        mtr.read_until(expected=b'\xFF\xFF\xFF\xFF')
+        size = mtr.read(size=1)
+        if size == b'\xe6':
+            meat = mtr.read(229)
+            full = b'\xFF\xFF\xFF\xFF' + size + meat
+            card_r = otime.CardDump.from_mtr_bytes(full)
+            card_dumps.append(card_r)
+    return card_dumps