diff --git a/ZPA_elektromer_UARTtest.ino b/ZPA_elektromer_UARTtest.ino
index b890fca..7b1c7a7 100644
--- a/ZPA_elektromer_UARTtest.ino
+++ b/ZPA_elektromer_UARTtest.ino
@@ -49,8 +49,19 @@ void setup() {
   Serial2.begin(300, SERIAL_7E1, 36, 4);
 
   Serial.println("Test ZPA elektro");
-
-
+  Serial.println("================");
+  Serial.println();
+  Serial.println("R - Request (sends /?!<CR><LF>)");
+  Serial.println("C - Change baudrate to 4800 (sends <ACK>040<CR><LF>)");
+  Serial.println();
+  Serial.println("Manual baudrate");
+  Serial.println("1 - 300b");
+  Serial.println("2 - 1200b");
+  Serial.println("3 - 2400b");
+  Serial.println("4 - 4800b");
+  Serial.println("5 - 9600b");
+  Serial.println();
+  Serial.println();
   Serial.println("Ready");
   Serial.print("IP address: ");
   Serial.println(WiFi.localIP());
@@ -71,7 +82,12 @@ void loop() {
     }
 
     if (r == 0x03) {
-      Serial.print("<ETX>");
+      Serial.println("<ETX>");
+      Serial.print("Checksum <BCC>: ");
+      Serial.println(Serial2.read());
+      Serial.println();
+      Serial.println("Changing back baudrate to 300");
+      Serial2.updateBaudRate(300);
       return;
     }
 
@@ -88,10 +104,37 @@ void loop() {
       return;
     }
 
+    if (r == '1') {
+      Serial.println("Baudrate to 300");
+      Serial2.updateBaudRate(300);
+    }
+
+    if (r == '2') {
+      Serial.println("Baudrate to 1200");
+      Serial2.updateBaudRate(1200);
+    }
+
+    if (r == '3') {
+      Serial.println("Baudrate to 2400");
+      Serial2.updateBaudRate(2400);
+    }
+
+    if (r == '4') {
+      Serial.println("Baudrate to 4800");
+      Serial2.updateBaudRate(4800);
+    }
+
+    if (r == '5') {
+      Serial.println("Baudrate to 9600");
+      Serial2.updateBaudRate(9600);
+    }
+
     if (r == 'C') {
-      Serial.println("Trying change baudrate");
+      Serial.println("Change baudrate");
       Serial2.write(0x06);
-      Serial2.print("030\r\n");
+      Serial2.print("040\r\n");
+      Serial2.flush();
+      Serial2.updateBaudRate(4800);
       return;
     }