pfeifferRS485: Improve dump command and allow for unknown parameters

pfeifferRS485.py

@@ -174,11 +174,13 @@ def dump(dev, decode):
     while True:
         addr, op, reg, data = dev.recv()
         print(f'{addr} {op} {reg} {data}')
-        if decode:
-            param = PARAMETERS[reg]
-            if op == Op.RESPONSE:
+        if decode and op == Op.RESPONSE:
+            param = PARAMETERS.get(reg)
+            if param:
                 value = param.decode(data)
-                print(f'{addr}:{reg} "{param.description}" = {value}')
+                print(f'{addr}:{reg}: "{param.description}" {value}')
+            else:
+                print(f'{addr}:{reg}: UNKNOWN')
 
 
 def _collect(dev, params):