Add convert_from to simple examples. (#2458)

Author: janiversen

examples/simple_async_client.py

@@ -13,7 +13,6 @@
 
 import pymodbus.client as ModbusClient
 from pymodbus import (
-    ExceptionResponse,
     FramerType,
     ModbusException,
     pymodbus_apply_logging_config,
@@ -75,14 +74,24 @@ async def run_async_simple_client(comm, host, port, framer=FramerType.SOCKET):
         client.close()
         return
     if rr.isError():
-        print(f"Received Modbus library error({rr})")
+        print(f"Received exception from device ({rr})")
+        # THIS IS NOT A PYTHON EXCEPTION, but a valid modbus message
+        client.close()
+        return
+    try:
+        # See all calls in client_calls.py
+        rr = await client.read_holding_registers(10, count=2, slave=1)
+    except ModbusException as exc:
+        print(f"Received ModbusException({exc}) from library")
         client.close()
         return
-    if isinstance(rr, ExceptionResponse):
-        print(f"Received Modbus library exception ({rr})")
+    if rr.isError():
+        print(f"Received exception from device ({rr})")
         # THIS IS NOT A PYTHON EXCEPTION, but a valid modbus message
         client.close()
-
+        return
+    value_int32 = client.convert_from_registers(rr.registers, data_type=client.DATATYPE.INT32)
+    print(f"Got int32: {value_int32}")
     print("close connection")
     client.close()
 

examples/simple_sync_client.py

@@ -15,7 +15,6 @@
 # --------------------------------------------------------------------------- #
 import pymodbus.client as ModbusClient
 from pymodbus import (
-    ExceptionResponse,
     FramerType,
     ModbusException,
     pymodbus_apply_logging_config,
@@ -74,13 +73,24 @@ def run_sync_simple_client(comm, host, port, framer=FramerType.SOCKET):
         client.close()
         return
     if rr.isError():
-        print(f"Received Modbus library error({rr})")
+        print(f"Received exception from device ({rr})")
+        # THIS IS NOT A PYTHON EXCEPTION, but a valid modbus message
+        client.close()
+        return
+    try:
+        # See all calls in client_calls.py
+        rr = client.read_holding_registers(10, count=2, slave=1)
+    except ModbusException as exc:
+        print(f"Received ModbusException({exc}) from library")
         client.close()
         return
-    if isinstance(rr, ExceptionResponse):
-        print(f"Received Modbus library exception ({rr})")
+    if rr.isError():
+        print(f"Received exception from device ({rr})")
         # THIS IS NOT A PYTHON EXCEPTION, but a valid modbus message
         client.close()
+        return
+    value_int32 = client.convert_from_registers(rr.registers, data_type=client.DATATYPE.INT32)
+    print(f"Got int32: {value_int32}")
 
     print("close connection")
     client.close()