diff --git a/simulator/rdtemp/cli.ino b/simulator/rdtemp/cli.ino
index cc3cf1e..fba2cbd 100644
--- a/simulator/rdtemp/cli.ino
+++ b/simulator/rdtemp/cli.ino
@@ -9,7 +9,25 @@
 
 #define DEBUG 0
 /* -------------------------------------------------- */
-
+short validate_config(Global *param)
+{
+short delta;
+  
+if (param->magic != 0xfde9) {
+  prtln("bad magic");
+  return 1;
+  }
+if (param->delai < 100) {
+  prtln("delay too short");
+  return 2;
+  }
+delta = param->temp_maxi - param->temp_mini;
+if (delta < 20) {
+  prt(delta); prtln(" bad delta");
+  return 3;
+  }
+return 0;
+}
 /* -------------------------------------------------- */
 char waitkey(char echo)
 {
@@ -73,6 +91,7 @@ static void clihelp()
  prtln("s h N\tset hi temp");
  prtln("d\tdisplay config");
  prtln("r\tread config");
+ prtln("v\tvalidate config");
  prtln("w\twrite config");
  prtln("T\ttest relay");
  prtln("+/-\tcontrole frigo");
@@ -172,6 +191,7 @@ do  {
     case 's':  setvalue(line, &parametres);            break;
     case 'T':  test_relais(5);                         break; 
 
+    case 'v':   validate_config(&parametres);          break;
     case '+':   controle_frigo(1);                     break;
     case '-':   controle_frigo(0);                     break;