diff --git a/schaltungen/displayboard_servo/software/src/main.c b/schaltungen/displayboard_servo/software/src/main.c
index 4daecea..9e02ce0 100644
--- a/schaltungen/displayboard_servo/software/src/main.c
+++ b/schaltungen/displayboard_servo/software/src/main.c
@@ -57,7 +57,7 @@ static void process_command(char *command) {
         // examples: 
         //	A24500,13400,12000,1,1,1B
         //	A19900,11000,15000,1,1,1B
-        //	A34100,15100,01000,1,1,1B
+        //	A20000,12300,10000,1,1,1B
 
         char *token;
         uint8_t tokencounter = 0;
diff --git a/schaltungen/displayboard_servo/tester.py b/schaltungen/displayboard_servo/tester.py
new file mode 100755
index 0000000..926b6c0
--- /dev/null
+++ b/schaltungen/displayboard_servo/tester.py
@@ -0,0 +1,35 @@
+#!/usr/bin/python
+import sys
+import tty
+import serial
+import time
+
+ser = serial.Serial("/dev/ttyUSB0", 38400)
+
+voltage = 20000
+current = 0
+incdec = 0
+
+while 1:
+	tdata = ser.read()
+	time.sleep(1)
+	data_left = ser.inWaiting()
+	tdata += ser.read(data_left)
+	
+	out = "A%05d,12300,%05d,1,1,1B" % (voltage, current)
+	print out
+	ser.write(out)
+
+	if incdec == 0:
+		current = current + 1000
+	else:
+		current = current - 1000
+		
+	if current > 20000:
+		current = 20000
+		incdec = 1
+		
+	if current < 0:
+		current = 0
+		incdec = 0
+