diff --git a/frappy_psi/lakeshore.py b/frappy_psi/lakeshore.py
index 17d3f24..31556a9 100644
--- a/frappy_psi/lakeshore.py
+++ b/frappy_psi/lakeshore.py
@@ -81,11 +81,11 @@ class Sensor340(LakeShore, Readable):
             return Warning
         return IDLE, ''
 
-    def write_alarm(self):
-        return self.set_par(f'ALARM {self.channel}, 1, 1, {self.alarm}, 0, 0, 2')
+    def write_alarm(self, alarm):
+        return self.set_par(f'ALARM {self.channel}', 1, 1, alarm, 0, 0, 2)[2]
 
     def read_alarm(self):
-        return self.get_par(f'ALARM? {self.channel}')[0]
+        return self.get_par(f'ALARM? {self.channel}')[2]
 
 
 class HeaterOutput(LakeShore, HasControlledBy, HasIO, Writable):