diff --git a/tests/pingpair_test/runtests.sh b/tests/pingpair_test/runtests.sh
index 53360c3..3416f86 100755
--- a/tests/pingpair_test/runtests.sh
+++ b/tests/pingpair_test/runtests.sh
@@ -4,5 +4,9 @@
 # WARNING: Test config 2 only works with PLUS units.
 
 jam u0 u1 && expect test.ex 1
-jam u0 u1 && expect test.ex 2
-jam u0 u1 && expect test.ex 3
+stty 57600 raw ignbrk hup < /dev/ttyUSB0 && sleep 1
+stty 57600 raw ignbrk hup < /dev/ttyUSB1 && sleep 1
+expect test.ex 2
+stty 57600 raw ignbrk hup < /dev/ttyUSB0 && sleep 1
+stty 57600 raw ignbrk hup < /dev/ttyUSB1 && sleep 1
+expect test.ex 3