diff --git a/func.sh b/func.sh
index ec1726f..ba6cb30 100755
--- a/func.sh
+++ b/func.sh
@@ -108,10 +108,10 @@ mendel_cmd() {
 		local RSC=0
 		local cmd="$*"
 		echo "$cmd" >&3;
-		while [ "$REPLY" != "OK" ]
+		while [ "$REPLY" != "OK" ] && [ "$REPLY" != "ok" ]
 		do
 			read -u 3
-			if [ "$REPLY" != "OK" ]
+			if [ "$REPLY" != "OK" ] && [ "$REPLY" != "ok" ]
 			then
 				echo "$REPLY"
 			fi
@@ -137,7 +137,7 @@ mendel_cmd_hr() {
 		local RSC=0
 		echo "$cmd" >&3
 		echo "S> $cmd"
-		while [ "$REPLY" != "OK" ]
+		while [ "$REPLY" != "OK" ] && [ "$REPLY" != "ok" ]
 		do
 			read -u 3
 			echo "<R $REPLY"
diff --git a/sender.sh b/sender.sh
index a4c5c2e..a7c1d9e 100755
--- a/sender.sh
+++ b/sender.sh
@@ -15,12 +15,11 @@ stty $BAUD raw ignbrk -hup -echo ixon < $DEV
 			echo "> $REPLY"
 			echo "$REPLY" >&3
 		fi
-		while [ "$REPLY" != "OK" ]
+		while [ "$REPLY" != "OK" ] && [ "$REPLY" != "ok" ]
 		do
 			read -s -u 3
 			echo "< $REPLY"
 		done
-		read -t 1
-		RV=$?
+		read -t 1; RV=$?
 	done
 ) 3<>$DEV