diff --git a/tecs/tecs.c b/tecs/tecs.c
index 29979a9..633a2b4 100644
--- a/tecs/tecs.c
+++ b/tecs/tecs.c
@@ -175,6 +175,7 @@ static int
   per, /* effective period */
   mmInt, mmTime, /* interval and time for next min-max logging */
   nScan=0, /* number of scanned channels */
+  iScan=1, /* actual scan channel */
   alarmListSize=0,
   keepT=0, /* keep control over power-up */
   swRangeOn=60, /* when not happen several times within less than 60 sec. delay,
@@ -303,7 +304,7 @@ int InstalCurve(SensorT *sensor, char *devArg) {
     *e, /* cache part after found entry */
     *t;
   int i, n;
-  char used[60];
+  char used[61];
   FILE *fil;
 
   sens=sensor;
@@ -379,7 +380,9 @@ int InstalCurve(SensorT *sensor, char *devArg) {
     entry=strstr(start, buf);
     if (entry==NULL) { /* sensor not found in cache */
       entry=start;
-      for (i=60;i>20;i--) used[i]=0;
+      for (i = 60; i > 20; i--) {
+        used[i]=0;
+      }
       n=40; num=0;
       while (entry!=NULL && n>0) {
         i=0;
@@ -572,6 +575,7 @@ void InitSensor(SensorT *s) {
   s->present=0;
   s->curve[0]='\0';
   s->type[0]='\0';
+  s->dispfld=0;
 }
 
 int PrepInput(char *label) {
@@ -633,6 +637,11 @@ again:
     InitSensor(&sensC);
     InitSensor(&sensD);
   }
+
+  for (i=5;i<9;i++) {
+    InitSensor(sensors[i]);
+  }
+
   empty=0;
   dev[0]='\0';
   str_copy(heUnits, "%");
@@ -681,10 +690,6 @@ again:
       s->typ='1'+i-5;
     }
     sensA.type[0]='\0';
-    for (i=5+nScan; i<N_SENSORS; i++) {
-      sensors[i]->t=DATA_UNDEF;
-      sensors[i]->present=0;
-    }
   }
   if (tLimit==0.0) {
     if (tMaxLimit==0.0) {
@@ -719,6 +724,14 @@ again:
     }
   }
 
+  for (i=5;i<9;i++) {
+    s=sensors[i];
+    if (s->type[0] != '\0') {
+      s->present=-1;
+    }
+    s->typ=s->type[0];
+  }
+
   if (!plug->devcmd) { /* set device name */
     str_copy(plug->device, nam);
     ConcatDevice();
@@ -1000,7 +1013,8 @@ int ReadTemp(void) {
   char buf[256], typ, *err, dispfmt;
   int i, doit, stat;
   int tfill, dfill;
-  static int iScan=0;
+  static time_t lastRead=0;
+  time_t now;
   float hlev;
   SensorT *s;
 
@@ -1008,16 +1022,27 @@ int ReadTemp(void) {
 
   doit=0;
   if (nScan>0) {
-    while (1) { /* read until a non-selected channel found */
-      if (iScan>=nScan) iScan=0;
-      s=sensors[iScan+5];
-      if (s->present<1) break;
+    time(&now);
+    if (lastRead == 0) {
+      lastRead = now;
+    } else if (now/30 != lastRead/30) {
+      s=sensors[iScan+4];
       str_copy(chan, s->ch);
-      ERR_P(LscCmd(ser, "KRDG?[chan]>fbuf;DIOST?>,out1"));
-      if (out1==iScan) break;
-      s->t=fbuf;
-      iScan++;
+      /* find next sensor s2 */
+      for (i = iScan; i < iScan - 1 + nScan; i++) {
+        sens = sensors[i % nScan + 5];
+        if (sens->present >= 1) {
+          iScan = i % nScan + 1;
+          break;
+        }
+      }
+      ibuf = iScan-1;
+      ERR_P(LscCmd(ser, "KRDG?[chan]>fbuf;DOUT 3,[ibuf];XSCAN 1,[iScan];DISPFLD [sens.dispfld],[chan],1"));
+      lastRead = now;
+      s->t = fbuf;
     }
+  } else {
+    lastRead = 0;
   }
   for (i=0; i<4; i++) {
     s=sensors[i];
@@ -1727,7 +1752,7 @@ int Settings(void) {
   SensorT *s;
   SensorT *fields[8];
   char *cfg, *p;
-  int i,k,l;
+  int i,k,l,kk;
 
   if (remoteMode!=2) {
     remoteMode=2; /* set to remote mode */
@@ -1746,9 +1771,11 @@ int Settings(void) {
     }
     if (s->present < 0) {
       if (settingsFlag) return 0;
+/*
       if (i==4) {
         ERR_P(LscCmd(ser, "DOUT:2;XSCAN:2,,2"));
       }
+*/
       ERR_I(InstalCurve(s, plug->device));
     }
   }
@@ -1797,9 +1824,13 @@ int Settings(void) {
   DisplayFmt(auxSens, fields, &k);
   if (nScan>0) {
     i=0;
+    kk=k;
     while (i<nScan && DisplayFmt(sensors[i+5], fields, &k)) {
+      if (k>4) k=kk;
       i++;
     }
+    k = kk + nScan + 1;
+    if (k > 4) k = 5;
   }
   maxfld=k-1;
 
@@ -3336,6 +3367,7 @@ int main(int argc, char *argv[]) {
   CocIntFld(SensorT, readStat, RD);
   CocIntFld(SensorT, stat1, RD);
   CocIntFld(SensorT, stat2, RD);
+  CocIntFld(SensorT, dispfld, RD);
   CocStrFld(SensorT, ch, RD);
   CocStrFld(SensorT, curve, RD);
   CocStrFld(SensorT, type, RD);
@@ -3444,6 +3476,7 @@ int main(int argc, char *argv[]) {
   CocDefInt(serialNo, RD);
   CocDefInt(quit, RW);
   CocDefInt(nScan, RD);
+  CocDefInt(iScan, RW);
   CocDefInt(keepT, RW);
   CocDefInt(swRangeOn, RW);
   CocDefInt(doubleControl, RW);