diff --git a/RS485-protocol-pylon-low-voltage-V3.3-20180821.pdf b/Specifications/RS485-protocol-pylon-low-voltage-V3.3-20180821.pdf
similarity index 100%
rename from RS485-protocol-pylon-low-voltage-V3.3-20180821.pdf
rename to Specifications/RS485-protocol-pylon-low-voltage-V3.3-20180821.pdf
diff --git a/Specifications/RS485-protocol-pylon-low-voltage-V3.5-20190807.pdf b/Specifications/RS485-protocol-pylon-low-voltage-V3.5-20190807.pdf
new file mode 100644
index 0000000..2a674ca
Binary files /dev/null and b/Specifications/RS485-protocol-pylon-low-voltage-V3.5-20190807.pdf differ
diff --git a/Specifications/Sunsynk_BatteryCompatibility_v12_English-1.pdf b/Specifications/Sunsynk_BatteryCompatibility_v12_English-1.pdf
new file mode 100644
index 0000000..aa7f261
Binary files /dev/null and b/Specifications/Sunsynk_BatteryCompatibility_v12_English-1.pdf differ
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..6f7824f
--- /dev/null
+++ b/main.py
@@ -0,0 +1,4 @@
+import pylontech
+
+p = pylontech.Pylontech(serial_port='COM3', baudrate=9600)
+print(p.get_values())
\ No newline at end of file
diff --git a/pylontech/pylontech.py b/pylontech/pylontech.py
index 356c6cc..6e3536f 100644
--- a/pylontech/pylontech.py
+++ b/pylontech/pylontech.py
@@ -2,6 +2,13 @@
 import logging
 import serial
 import construct
+import logging
+import time
+
+logging.basicConfig(
+    level=logging.INFO,
+    format='%(asctime)s - %(name)s:%(funcName)s:%(lineno)d - %(levelname)s - %(message)s'
+)
 
 logger = logging.getLogger(__name__)
 
@@ -171,17 +178,21 @@ def get_info_length(info: bytes) -> int:
 
     def send_cmd(self, address: int, cmd, info: bytes = b''):
         raw_frame = self._encode_cmd(address, cmd, info)
+        logger.debug(f"{raw_frame=}")
         self.s.write(raw_frame)
 
 
     def _encode_cmd(self, address: int, cid2: int, info: bytes = b''):
+        ver = 0x20
         cid1 = 0x46
 
         info_length = Pylontech.get_info_length(info)
 
-        frame = "{:02X}{:02X}{:02X}{:02X}{:04X}".format(0x20, address, cid1, cid2, info_length).encode()
+        frame = "{:02X}{:02X}{:02X}{:02X}{:04X}".format(ver, address, cid1, cid2, info_length).encode()
         frame += info
 
+        logger.info(f"VER=%s; ADDR=%s; CID1={cid1:02X}H; CID2={cid2:02X}H; frame.INFO=%s", ver, address, info.decode())
+
         frame_chksum = Pylontech.get_frame_checksum(frame)
         whole_frame = (b"~" + frame + "{:04X}".format(frame_chksum).encode() + b"\r")
         return whole_frame
@@ -212,9 +223,15 @@ def _decode_frame(self, frame):
 
     def read_frame(self):
         raw_frame = self.s.readline()
-        f = self._decode_hw_frame(raw_frame=raw_frame)
-        parsed = self._decode_frame(f)
-        return parsed
+        logger.debug(f"{raw_frame=}")
+        chk_frame = self._decode_hw_frame(raw_frame=raw_frame)
+        logger.debug(f"{chk_frame=}")
+        dec_frame = self._decode_frame(chk_frame)
+        data = b'\x05\xff\x0a';
+        logger.info(f"VER=%s; ADDR=%s; CID1={dec_frame.cid1[0]:02X}H; CID2={dec_frame.cid2[0]:02X}H; frame.INFO=%s", ord(dec_frame.ver), ord(dec_frame.adr), dec_frame.info.hex(" ").upper())
+
+        logger.debug(f"{dec_frame=}")
+        return dec_frame
 
 
     def scan_for_batteries(self, start=0, end=255) -> Dict[int, str]:
@@ -284,9 +301,13 @@ def get_values(self):
         self.send_cmd(2, 0x42, b'FF')
         f = self.read_frame()
 
-        # infoflag = f.info[0]
-        d = self.get_values_fmt.parse(f.info[1:])
-        return d
+        if f.cid2 == b'\x00':
+#            infoflag = f.info[0]
+            d = self.get_values_fmt.parse(f.info[1:])
+            return d
+        else:
+            return -1
+        return -2
 
     def get_values_single(self, dev_id):
         bdevid = "{:02X}".format(dev_id).encode()