diff --git a/F0:F030,F042,F072/TSYS_controller/main.c b/F0:F030,F042,F072/TSYS_controller/main.c
index 65296fd..1a007ad 100644
--- a/F0:F030,F042,F072/TSYS_controller/main.c
+++ b/F0:F030,F042,F072/TSYS_controller/main.c
@@ -133,7 +133,7 @@ int main(void){
 #endif
             cmd_parser(txt, 0);
         }
-        if(lastTprint - Tms > 249){ // run `sendbuf` each 250ms
+        if(Tms - lastTprint > 249){ // run `sendbuf` each 250ms
             sendbuf();
         }
     }
diff --git a/F0:F030,F042,F072/TSYS_controller/proto.c b/F0:F030,F042,F072/TSYS_controller/proto.c
index fdfb04c..eebffa6 100644
--- a/F0:F030,F042,F072/TSYS_controller/proto.c
+++ b/F0:F030,F042,F072/TSYS_controller/proto.c
@@ -77,9 +77,12 @@ void sendbuf(){
         }else if(s != LINE_BUSY) break;
 #ifdef EBUG
     if(DMA1->ISR & DMA_ISR_TCIF2) USB_sendstr("DMA rdy\n");
-    USB_sendstr("  sendbuf: line busy\n");
+    USB_sendstr("  sendbuf(): line busy\n");
 #endif
     }
+#ifdef EBUG
+    USB_sendstr("    sent or not\n");
+#endif
     bptr = buff;
     blen = 0;
     lastTprint = Tms;
@@ -90,6 +93,9 @@ void addtobuf(const char *txt){
     IWDG->KR = IWDG_REFRESH;
     int l = strlen(txt);
     if(l > UARTBUFSZ){
+#ifdef EBUG
+    USB_sendstr("l>UARTBUFSZ -> sendbuf\n");
+#endif
         sendbuf(); // send prevoius data in buffer
         if(cmdsource == SRC_USB) USB_sendstr(txt);
         else for(int i = 0; i < WAITFOR; ++i){
@@ -106,6 +112,9 @@ void addtobuf(const char *txt){
         }
     }else{
         if(blen+l > UARTBUFSZ){
+#ifdef EBUG
+        USB_sendstr("blen+l>UARTBUFSZ -> sendbuf\n");
+#endif
             sendbuf();
         }
         strcpy(bptr, txt);
@@ -118,6 +127,9 @@ void addtobuf(const char *txt){
 
 void bufputchar(char ch){
     if(blen > UARTBUFSZ-1){
+#ifdef EBUG
+        USB_sendstr("bufputchar() -> sendbuf\n");
+#endif
         sendbuf();
     }
     *bptr++ = ch;
diff --git a/F0:F030,F042,F072/TSYS_controller/tsys01.bin b/F0:F030,F042,F072/TSYS_controller/tsys01.bin
index b6c1242..9dea7b4 100755
Binary files a/F0:F030,F042,F072/TSYS_controller/tsys01.bin and b/F0:F030,F042,F072/TSYS_controller/tsys01.bin differ
diff --git a/F0:F030,F042,F072/TSYS_controller/usart.h b/F0:F030,F042,F072/TSYS_controller/usart.h
index 82de9cb..fdd840a 100644
--- a/F0:F030,F042,F072/TSYS_controller/usart.h
+++ b/F0:F030,F042,F072/TSYS_controller/usart.h
@@ -23,7 +23,7 @@
 #define __USART_H__
 
 // output buffers size
-#define UARTBUFSZ   (512)
+#define UARTBUFSZ   (1535)
 // input buffer size
 #define UARTINBUFSZ (64)
 // timeout between data bytes
diff --git a/F0:F030,F042,F072/TSYS_controller/version.inc b/F0:F030,F042,F072/TSYS_controller/version.inc
index a2db9fe..986b7c8 100644
--- a/F0:F030,F042,F072/TSYS_controller/version.inc
+++ b/F0:F030,F042,F072/TSYS_controller/version.inc
@@ -1,3 +1,3 @@
-#define BUILD_NUMBER "130"
-#define BUILD_DATE "2023-09-29"
-#define BUILDNO 130
+#define BUILD_NUMBER "139"
+#define BUILD_DATE "2023-10-02"
+#define BUILDNO 139