diff --git a/STM32/TSYS_controller/2DO b/STM32/TSYS_controller/2DO
index b215f7f..e9245ca 100644
--- a/STM32/TSYS_controller/2DO
+++ b/STM32/TSYS_controller/2DO
@@ -1,5 +1,4 @@
 - CAN bus: PB8 (Rx), PB9 (Tx)
 - USB bus: PA11 (DM), PA12 (DP)
 - ADC inputs: PA0 (V12/4.93), PA1 (V5/2), PA3 (I12 - 1V/A), PA6 (V3.3/2)
-- controller CAN address: PA13..PA15 (0..2 bits); 0 - master, other address - slave
 
diff --git a/STM32/TSYS_controller/main.c b/STM32/TSYS_controller/main.c
index e800e4e..e94b9c2 100644
--- a/STM32/TSYS_controller/main.c
+++ b/STM32/TSYS_controller/main.c
@@ -64,6 +64,7 @@ void iwdg_setup(){
 int main(void){
     uint32_t lastT = 0, lastS = 0;
     int16_t L = 0;
+    uint8_t scan = 0, gotmeasurement = 0;
     char *txt;
     sysreset();
     SysTick_Config(6000, 1);
@@ -87,6 +88,20 @@ int main(void){
             sensors_process();
             lastS = Tms;
         }
+        if(scan){
+            if(SENS_SLEEPING == sensors_get_state()){ // show temperature @ each sleeping occurence
+                if(!gotmeasurement){
+                    //SEND("\nTIME=");
+                    printu(Tms);
+                    usart_putchar('\t');
+                    //newline();
+                    gotmeasurement = 1;
+                    showtemperature();
+                }
+            }else{
+                gotmeasurement = 0;
+            }
+        }
         if(usartrx()){ // usart1 received data, store in in buffer
             L = usart_getline(&txt);
             char _1st = txt[0];
@@ -99,6 +114,9 @@ int main(void){
                     case 'O':
                         sensors_on();
                     break;
+                    case 'F':
+                        sensors_off();
+                    break;
                     case 'T': // 'T' - get temperature
                         showtemperature();
                     break;
@@ -123,6 +141,14 @@ int main(void){
                         printu(getCANaddr());
                         newline();
                     break;
+                    case 'S':
+                        SEND("Start scan mode\n");
+                        scan = 1;
+                    break;
+                    case 'P':
+                        SEND("End scan mode\n");
+                        scan = 0;
+                    break;
 #ifdef EBUG
                     case 'd':
                     case 'g':
@@ -136,13 +162,16 @@ int main(void){
 #endif
                     default: // help
                         SEND("'C' - show coefficients\n"
-                        "'O' - turn On sensors\n"
-                        "'T' - get raw temperature\n"
-                        "'R' - reinit I2C\n"
-                        "'V' - very low speed\n"
-                        "'L' - low speed\n"
-                        "'H' - high speed\n"
                         "'G' - get CAN address\n"
+                        "'F' - turn oFf sensors\n"
+                        "'H' - high speed\n"
+                        "'L' - low speed\n"
+                        "'O' - turn On sensors\n"
+                        "'P' - stoP themperature scan\n"
+                        "'R' - reinit I2C\n"
+                        "'S' - Start themperature scan\n"
+                        "'T' - get raw temperature\n"
+                        "'V' - very low speed\n"
 #ifdef EBUG
                         "\t\tTEST OPTIONS\n"
                         "'d' - discovery\n"
diff --git a/STM32/TSYS_controller/sensors_manage.c b/STM32/TSYS_controller/sensors_manage.c
index 9849ae0..36cbc41 100644
--- a/STM32/TSYS_controller/sensors_manage.c
+++ b/STM32/TSYS_controller/sensors_manage.c
@@ -210,11 +210,11 @@ newline();
 MSG("try more\n");
             if(!write_i2c(Taddr[i], TSYS01_RESET)) i2c_setup(CURRENT_SPEED); // maybe I2C restart will solve the problem?
         }
-        if(j == 5){
-MSG("error start monitoring, reset\n");
+        /*if(j == 5){
+MSG("error start monitoring, reset counter\n");
             sensors_on(); // all very bad
             return 1;
-        }
+        }*/
     }
     return 0;
 }
@@ -224,6 +224,7 @@ static uint8_t gettempproc(){
     uint8_t i;
     for(i = 0; i < 2; ++i){
         if(!(sens_present[i] & (1<<curr_mul_addr))) continue; // no sensors @ given line
+        Temperatures[curr_mul_addr][i] = NO_SENSOR;
         uint8_t err = 1;
 MSG("Sensor #");
 #ifdef EBUG
@@ -311,21 +312,28 @@ void showtemperature(){
     }
     if(Ntemp_measured == 0){
         SEND("No right measurements\n");
+        return;
     }
     for(a = 0; a <= MUL_MAX_ADDRESS; ++a){
         for(p = 0; p < 2; ++p){
-            if(!(sens_present[p] & (1<<a))) continue; // no sensor
-            char b[] = {'T', a+'0', p+'0', '=', '+'};
+            if(!(sens_present[p] & (1<<a))){
+                SEND("-31000\t"); // NO_SENSOR
+                continue; // no sensor
+            }
+            //char b[] = {'T', a+'0', p+'0', '=', '+'};
             int16_t t = Temperatures[a][p];
             if(t < 0){
-                b[4] = '-';
+                //b[4] = '-';
                 t = -t;
+                usart_putchar('-');
             }
-            while(ALL_OK != usart_send_blocking(b, 5));
+            //while(ALL_OK != usart_send_blocking(b, 5));
             printu(t);
-            newline();
+            usart_putchar('\t');
+            //newline();
         }
     }
+    newline();
 }
 
 // finite state machine for sensors switching & checking
@@ -386,6 +394,10 @@ MSG("->gather\n");
         case SENS_GATHERING: // scan all sensors, get thermal data & calculate temperature
             if(sensors_scan(gettempproc)){
                 lastSensT = Tms;
+                if(Nsens_present != Ntemp_measured) i2c_setup(CURRENT_SPEED);
+                Sstate = SENS_SLEEPING;
+MSG("->sleep\n");
+                /*
                 if(Nsens_present == Ntemp_measured){ // All OK, amount of T == amount of sensors
 MSG("->sleep\n");
                     Sstate = SENS_SLEEPING;
@@ -393,7 +405,7 @@ MSG("->sleep\n");
 MSG("gather error ->start\n");
                     i2c_setup(CURRENT_SPEED);
                     Sstate = SENS_START_MSRMNT;
-                }
+                }*/
             }
         break;
         case SENS_SLEEPING: // wait for `SLEEP_TIME` till next measurements
diff --git a/STM32/TSYS_controller/sensors_manage.h b/STM32/TSYS_controller/sensors_manage.h
index 335bb66..c699783 100644
--- a/STM32/TSYS_controller/sensors_manage.h
+++ b/STM32/TSYS_controller/sensors_manage.h
@@ -32,6 +32,8 @@
 #define SLEEP_TIME          (3000)
 // error in measurement == -300degrC
 #define BAD_TEMPERATURE     (-30000)
+// no sensor on given channel
+#define NO_SENSOR           (-31000)
 
 typedef enum{
      SENS_INITING           // power on
diff --git a/STM32/TSYS_controller/tsys01.bin b/STM32/TSYS_controller/tsys01.bin
index 4198438..52a2d04 100755
Binary files a/STM32/TSYS_controller/tsys01.bin and b/STM32/TSYS_controller/tsys01.bin differ
diff --git a/STM32/TSYS_controller/usart.c b/STM32/TSYS_controller/usart.c
index 5ab9c7f..47c5e44 100644
--- a/STM32/TSYS_controller/usart.c
+++ b/STM32/TSYS_controller/usart.c
@@ -26,7 +26,7 @@
 extern volatile uint32_t Tms;
 static int datalen[2] = {0,0}; // received data line length (including '\n')
 
-int linerdy = 0,        // received data ready
+volatile int linerdy = 0,        // received data ready
     dlen = 0,           // length of data (including '\n') in current buffer
     bufovr = 0,         // input buffer overfull
     txrdy = 1           // transmission done
diff --git a/STM32/TSYS_controller/usart.h b/STM32/TSYS_controller/usart.h
index 8ecd6d3..f1d1d50 100644
--- a/STM32/TSYS_controller/usart.h
+++ b/STM32/TSYS_controller/usart.h
@@ -31,7 +31,6 @@
 
 // macro for static strings
 #define SEND(str) do{}while(LINE_BUSY == usart_send_blocking(str, sizeof(str)-1))
-#define NEWLINE() do{}while(LINE_BUSY == usart_send_blocking('\n', 1))
 
 #ifdef EBUG
 #define MSG(str)  do{SEND(__FILE__ " (L" STR(__LINE__) "): " str);}while(0)
@@ -48,7 +47,7 @@ typedef enum{
 #define usartrx()  (linerdy)
 #define usartovr() (bufovr)
 
-extern int linerdy, bufovr, txrdy;
+extern volatile int linerdy, bufovr, txrdy;
 
 void usart_setup();
 int usart_getline(char **line);