diff --git a/db/pyheatpump.sql b/db/pyheatpump.sql
index d9ef711..d9e3654 100644
--- a/db/pyheatpump.sql
+++ b/db/pyheatpump.sql
@@ -32,11 +32,11 @@ CREATE TABLE IF NOT EXISTS var_value (
 );
 
 INSERT INTO var_type (slabel, label, type, start_address, end_address) VALUES (
-	'A', 'Analog', 'float', 1, (1 + 500));
+	'A', 'Analog', 'float', 1, 5000);
 INSERT INTO var_type (slabel, label, type, start_address, end_address) VALUES (
-	'I', 'Integer', 'int', 5002, (5002 + 500));
+	'I', 'Integer', 'int', 5002, 10002);
 INSERT INTO var_type (slabel, label, type, start_address, end_address) VALUES (
-	'D', 'Digital', 'boolean', 1, (1 + 1000));
+	'D', 'Digital', 'bool', 1, 2048);
 
 CREATE TRIGGER variable_insert BEFORE INSERT ON var_value
 FOR EACH ROW
diff --git a/poetry.lock b/poetry.lock
index dc3b4f3..12c1f61 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -273,7 +273,7 @@ description = "The lightning-fast ASGI server."
 name = "uvicorn"
 optional = false
 python-versions = "*"
-version = "0.11.6"
+version = "0.11.8"
 
 [package.dependencies]
 click = ">=7.0.0,<8.0.0"
@@ -436,8 +436,8 @@ urllib3 = [
     {file = "urllib3-1.25.10.tar.gz", hash = "sha256:91056c15fa70756691db97756772bb1eb9678fa585d9184f24534b100dc60f4a"},
 ]
 uvicorn = [
-    {file = "uvicorn-0.11.6-py3-none-any.whl", hash = "sha256:d19a20b17445708fd222e5a7cfc3eacfb31ac269bc8fefa4920833334e199782"},
-    {file = "uvicorn-0.11.6.tar.gz", hash = "sha256:467c333c743ec6a3eb545517a0e3cac603becfa40c73c65ed46c3a4bf1c8e2d0"},
+    {file = "uvicorn-0.11.8-py3-none-any.whl", hash = "sha256:4b70ddb4c1946e39db9f3082d53e323dfd50634b95fd83625d778729ef1730ef"},
+    {file = "uvicorn-0.11.8.tar.gz", hash = "sha256:46a83e371f37ea7ff29577d00015f02c942410288fb57def6440f2653fff1d26"},
 ]
 uvloop = [
     {file = "uvloop-0.14.0-cp35-cp35m-macosx_10_11_x86_64.whl", hash = "sha256:08b109f0213af392150e2fe6f81d33261bb5ce968a288eb698aad4f46eb711bd"},
diff --git a/pyheatpump/modbus.py b/pyheatpump/modbus.py
index cc10792..40b3241 100755
--- a/pyheatpump/modbus.py
+++ b/pyheatpump/modbus.py
@@ -2,6 +2,7 @@
 from serial import Serial
 from serial.serialutil import SerialException
 from umodbus.client.serial import rtu
+import umodbus
 from pprint import pprint
 
 from pyheatpump.conf import config
@@ -14,8 +15,12 @@ def connect():
     if serial_conn is None:
         print('Connecting to serial port *{}*'.format(
             config.get('heatpump', 'serial_port')))
-        serial_conn = Serial(config.get('heatpump', 'serial_port'),
-            config.get('heatpump', 'baudrate'))
+        serial_conn = Serial(
+            port=config.get('heatpump', 'serial_port'),
+            baudrate=config.get('heatpump', 'baudrate'),
+            bytesize=8,
+            parity='N',
+            stopbits=1)
 
     if serial_conn.open is False:
         print('Opening serial port')
@@ -25,38 +30,54 @@ def connect():
 
 def read_coils(start, end):
     global serial_con
+    connect()
     res = []
 
-    # digital - boolean
-    req_adu = rtu.read_coils(
-        slave_id=1,
-        starting_address=start,
-        quantity=end - start)
-
-    resp = rtu.send_message(req_adu, serial_conn)
+    try:
+        for address in range(start, end + 1, 125):
+            qty = 125 if (end - address) >= 125 else (end - address)
+            if not qty:
+                break
+            print(start, end, address, qty)
+            req_adu = rtu.read_coils(
+                slave_id=1,
+                starting_address=address,
+                quantity=qty)
 
+            resp = rtu.send_message(req_adu, serial_conn)
+            res.extend(resp)
+    except umodbus.exceptions.IllegalDataAddressError as e:
+        print(e)
     return res
 
 
+
 def read_holding_registers(start, end):
     global serial_conn
+    connect()
     res = []
 
+    try:
+        for address in range(start, end + 1, 125):
+            qty = 125 if (end - address) >= 125 else (end - address)
+            if not qty:
+                break
+            print(start, end, address, qty)
+            req_adu = rtu.read_holding_registers(
+                slave_id=1,
+                starting_address=address,
+                quantity=qty)
 
-    for address in range(start, end + 1, 125):
-        qty = 125 if (end - address) >= 125 else (end - address)
-        if not qty:
-            break
-        print(start, end, address, qty)
-        req_adu = rtu.read_coils(
-            slave_id=1,
-            starting_address=address,
-            quantity=qty)
-
-        resp = rtu.send_message(req_adu, serial_conn)
-        res.extend(resp)
+            resp = rtu.send_message(req_adu, serial_conn)
+            res.extend(resp)
+    except umodbus.exceptions.IllegalDataAddressError as e:
+        print(e)
     return res
 
 if __name__ == '__main__':
-    connect()
-    read_holding_registers(1, 10)
+    resp = read_holding_registers(1, 5000)
+    #pprint(resp)
+    print(len(resp))
+    resp = read_coils(1, 2000)
+    #pprint(resp)
+    print(len(resp))
diff --git a/pyproject.toml b/pyproject.toml
index baf829b..d22444d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,8 +8,8 @@ license = "GPL-3.0-or-later"
 [tool.poetry.dependencies]
 python = "^3.7"
 starlette = "^0.13.6"
-umodbus = "^1.0.3"
 uvicorn = "^0.11.6"
+umodbus = "^1.0.3"
 
 [tool.poetry.dev-dependencies]
 pytest = "^5.4.3"
diff --git a/pytest.ini b/pytest.ini
index 9b66c86..5eda076 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -1,3 +1,3 @@
 [pytest]
 testpaths = tests
-addopts = -rP
+#addopts = -r
diff --git a/tests/test_modbus.py b/tests/test_modbus.py
index 675616e..77db9ee 100755
--- a/tests/test_modbus.py
+++ b/tests/test_modbus.py
@@ -33,7 +33,7 @@ def set_test_db():
 
     yield
 
-    os.unlink(tmpdb)
+    #os.unlink(tmpdb)
 
 @pytest.fixture(scope='module')
 def serial_conn():
@@ -44,8 +44,8 @@ def serial_conn():
 
 @patch('umodbus.client.serial.rtu.send_message')
 @patch('umodbus.client.serial.rtu.read_coils')
-def test_rtu_call_mocked(RtuReadCoils, RtuSendMessage, serial_conn):
-    modbus.read_holding_registers(1, 3)
+def test_rtu__coils_call_mocked(RtuReadCoils, RtuSendMessage, serial_conn):
+    modbus.read_coils(1, 3)
     RtuReadCoils.assert_any_call(slave_id=1, starting_address=1, quantity=2)
     RtuSendMessage.assert_called()
 
@@ -53,6 +53,18 @@ def test_rtu_call_mocked(RtuReadCoils, RtuSendMessage, serial_conn):
     RtuReadCoils.assert_any_call(slave_id=1, starting_address=1, quantity=2)
     RtuSendMessage.assert_called()
 
+
+@patch('umodbus.client.serial.rtu.send_message')
+@patch('umodbus.client.serial.rtu.read_holding_registers')
+def test_rtu_registers_call_mocked(RtuReadHoldingRegisters, RtuSendMessage, serial_conn):
+    modbus.read_holding_registers(1, 3)
+    RtuReadHoldingRegisters.assert_any_call(slave_id=1, starting_address=1, quantity=2)
+    RtuSendMessage.assert_called()
+
+    modbus.read_holding_registers(1, 500)
+    RtuReadHoldingRegisters.assert_any_call(slave_id=1, starting_address=1, quantity=125)
+    RtuSendMessage.assert_called()
+
 def test_rtu_call_holding_registers(serial_conn):
     r = modbus.read_holding_registers(1, 1)
     assert type(r) == list
@@ -70,25 +82,45 @@ def test_rtu_call_holding_registers(serial_conn):
     assert type(r) == list
     assert len(r) == 150
 
+@pytest.fixture
+def var_types():
+    return VariableType.getall()
 
-
-
-def test_get_var(set_test_db, serial_conn):
-    d_var_types = VariableType.getall()
-
-    analog = d_var_types['Analog']
+def test_get_analog(set_test_db, serial_conn, var_types):
+    analog = var_types['Analog']
+    print(analog.__dict__)
     res = modbus.read_holding_registers(analog.start_address, analog.end_address)
     assert type(res) == list
     assert len(res) == analog.end_address - analog.start_address
     for r in res:
         assert type(r) == int
 
-    integer = d_var_types['Integer']
+def test_get_integer(set_test_db, serial_conn, var_types):
+    integer = var_types['Integer']
+    print(integer.__dict__)
     try:
         res = modbus.read_holding_registers(integer.start_address, integer.end_address)
-    except umodbus.exceptions.IllegalDataAddressError:
+        assert type(res) == list
+        assert len(res) == integer.end_address - integer.start_address
+        for r in res:
+            assert type(r) == int
+
+    except umodbus.exceptions.IllegalDataAddressError as e:
+        print(e)
         print(f'The start and end addresses are not available [{integer.start_address}, {integer.end_address}]')
+        assert False
+
+
+def test_get_digital(set_test_db, serial_conn, var_types):
+    digital = var_types['Digital']
+    print(digital.__dict__)
+    try:
+        res = modbus.read_coils(digital.start_address, digital.end_address)
+    except umodbus.exceptions.IllegalDataAddressError:
+        print(f'The start and end addresses are not available [{digital.start_address}, {digital.end_address}]')
     assert type(res) == list
-    assert len(res) == integer.end_address - integer.start_address
+    assert len(res) == digital.end_address - digital.start_address
     for r in res:
         assert type(r) == int
+        assert r in [0, 1]
+