new test script and ENV script

snippets/test6.py

@@ -0,0 +1,21 @@
+from pymodbus.client.sync import ModbusSerialClient
+import RS485Ext
+import time
+
+ser=RS485Ext.RS485Ext(port='/dev/ttyAMA0', baudrate=1200, stopbits=2)
+
+client = ModbusSerialClient(method='rtu')
+client.socket = ser
+client.connect()
+
+while True:
+    try:
+        result = client.read_holding_registers(address=0x2000, count=2, unit=1)
+        print(result)
+        print(result.registers)
+    except Exception as e:
+        print("ERROR: %s" % str(e))
+    time.sleep(2)
+
+client.close()
+