updated README

README.md

@@ -3,6 +3,52 @@ pyads - Python package
 
 [![Code Issues](http://www.quantifiedcode.com/api/v1/project/3e884877fac4408ea0d33ec4a788a212/badge.svg)](http://www.quantifiedcode.com/app/project/3e884877fac4408ea0d33ec4a788a212)
 
-This is a simple python wrapper for TwinCATs ADS library. It provides
-python functions for communicating with TwinCAT devices.
+This is a python wrapper for TwinCATs ADS library. It provides python functions
+for communicating with TwinCAT devices. *pyads* uses the C API *AdsDLL.dll*. The
+documentation for the ADS API is available on [infosys.beckhoff.com](http://infosys.beckhoff.com/english.php?content=../content/1033/tcadsdll2/html/tcadsdll_api_overview.htm&id=20557).
+### Some Samples
 
+**open port, set port number to 801**
+```python
+>>> port = adsPortOpen()
+>>> adr = adsGetLocalAddress()
+>>> adr.setPort(PORT_SPS1)
+```
+
+**set ADS-state and machine-state**
+```python
+>>> adsSyncWriteControlReq(adr, ADSSTATE_STOP, 0, 0)
+```
+
+**read bit %MX100.0, toggle it and write back to plc**
+```python
+>>> data = adsSyncReadReq(adr, INDEXGROUP_MEMORYBIT, 100*8 + 0, PLCTYPE_BOOL)
+>>> adsSyncWriteReq(adr, INDEXGROUP_MEMORYBIT, 100*8 + 0, not data)
+```
+
+**write an UDINT value to MW0 and read it from plc**
+```python
+>>> adsSyncWriteReq(adr, INDEXGROUP_MEMORYBYTE, 0, 65536, PLCTYPE_UDINT)
+>>> adsSyncReadReq(adr, INDEXGROUP_MEMORYBYTE, 0, PLCTYPE_UDINT)
+```
+
+**write a string value in MW0 and read it from plc**
+```python
+>>> adsSyncWriteReq(adr, INDEXGROUP_MEMORYBYTE, 0, "Hallo, wie geht es?", PLCTYPE_STRING)
+>>> adsSyncReadReq(adr, INDEXGROUP_MEMORY_BYTE, 0, PLCTYPE_STRING)
+```
+
+**read a value of type real from global variable foo**
+```python
+>>> adsSyncReadByName(adr, ".foo", PLCTYPE_REAL)
+```
+
+**write a value of type real to global variable bar**
+```python
+>>> adsSyncWriteByName(adr, ".bar", 1.234, PLCTYPE_REAL)
+```
+
+**close port**
+```python
+>>> adsPortClose()
+```