diff --git a/conf.yaml b/conf.yaml
index ea66e94..c786588 100644
--- a/conf.yaml
+++ b/conf.yaml
@@ -15,4 +15,12 @@
 - devicematch: ^vchiq$
   nummaxdevices: 20
 - devicematch: ^vcsm.*$
-  nummaxdevices: 20
\ No newline at end of file
+  nummaxdevices: 20
+- devicematch: ^ttyUSB[0-9]*$
+  nummaxdevices: 1
+- devicematch: ^ttyACM[0-9]*$
+  nummaxdevices: 1
+- devicematch: ^ttyTHS[0-9]*$
+  nummaxdevices: 1
+- devicematch: ^ttyS[0-9]*$
+  nummaxdevices: 1
\ No newline at end of file