diff --git a/source/_integrations/ness_alarm.markdown b/source/_integrations/ness_alarm.markdown
index f85de8060b0..1ff866339f7 100644
--- a/source/_integrations/ness_alarm.markdown
+++ b/source/_integrations/ness_alarm.markdown
@@ -21,7 +21,7 @@ There is currently support for the following device types within Home Assistant:
 - Binary Sensor: Reports on zone statuses
 - Alarm Control Panel: Reports on alarm status, and can be used to arm/disarm the system
 
-The module communicates via the [Ness D8x/D16x ASCII protocol](http://www.nesscorporation.com/Software/Ness_D8-D16_ASCII_protocol.pdf).
+The module communicates via the [Ness D8x/D16x ASCII protocol](https://ia601401.us.archive.org/34/items/ness-d-8x-d-16x-serial-interface.-ascii-protocol/Ness%20D8x%20D16x%20Serial%20Interface.%20ASCII%20Protocol.pdf).
 
 ## Configuration