diff --git a/main.c b/main.c
index 7168eba..daaaba8 100644
--- a/main.c
+++ b/main.c
@@ -16,6 +16,8 @@
 #include "spi.h"
 #include "mqtt.h"
 #include "temperature.h"
+#include "modbus-master.h"
+#include "gefran_gtf.h"
 
 #include "util/delay.h"
 
@@ -159,6 +161,9 @@ int main()
 
     ioHelperSetBit(outStatesBlinking,  LED_PLC_OK,  1);
 
+    ioHelperSetBit(outStates, OUT_PUMPE_STARTSTOP,  1);
+    ioHelperSetBit(outStates, OUT_PUMPE_PWM,  1);
+
     uint32_t timer_blink_outs = millis();
     uint32_t timer_send_uptime = millis();
 
@@ -180,6 +185,7 @@ int main()
             send_values();
 #endif
             timer_blink_outs = millis();
+            printf("gefran: 0x%02X\n", gtf_firmware_version(5));
         }
 
 #if PLC_MQTT_ENABLED
@@ -236,6 +242,8 @@ static void avr_init(void)
     uart_init();
     initADC();
 
+    modbus_master_init();
+
     sei(); //re-enable global interrupts
 
     return;