diff --git a/epics/iocs/dsPICTemp/iocBoot/iocISTTOK/99-usb-serial.rules b/epics/iocs/dsPICTemp/iocBoot/iocISTTOK/99-usb-serial.rules
new file mode 100644
index 0000000..83acea2
--- /dev/null
+++ b/epics/iocs/dsPICTemp/iocBoot/iocISTTOK/99-usb-serial.rules
@@ -0,0 +1,5 @@
+# https://dev.to/enbis/how-udev-rules-can-help-us-to-recognize-a-usb-to-serial-device-over-dev-tty-interface-pbk
+#
+#SUBSYSTEM=="tty", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", SYMLINK+="tty%E{ID_MODEL}"
+SUBSYSTEM=="tty", ATTRS{idVendor}=="1a86", ATTRS{idProduct}=="7523", SYMLINK+="dsPIC0"
+#SUBSYSTEM=="usb", ATTRS{idVendor}=="1a86", ATTRS{idProduct}=="7523", SYMLINK+="dsPIC0"