diff --git a/control_seekat_demo.py b/control_seekat_demo.py
index ec3db20..8f3ad87 100644
--- a/control_seekat_demo.py
+++ b/control_seekat_demo.py
@@ -5,6 +5,8 @@ import serial
 import serial.tools.list_ports
 import re
 
+CHANGE_BUTTONS = ["SET_do", "RAMP_do", "sel_ref", "sel_do"]
+
 def error_popup(parent, msg):
 	box = Gtk.MessageDialog(
 		parent=parent,
@@ -25,7 +27,9 @@ class SerComm:
 		s = self.ser.read_until().decode()
 		if not s:
 			raise Exception(f"DAC timeout: '{s}'")
-		return s.rstrip("\r\n")
+		s = s.rstrip("\r\n")
+		self.getobj("dac_resp").set_text(s)
+		return s
 
 	def connect(self):
 		s = self.sel_box.get_active_id()
@@ -53,10 +57,16 @@ class SerComm:
 		self.getobj("dac_idn").set_label(self.get_or_to())
 
 	def on_connect(self, _):
+		for x in CHANGE_BUTTONS:
+			self.getobj(x).set_sensitive(False)
+
 		try:
 			self.connect()
 		except Exception as e:
-			self.error_popup(str(e))			
+			self.error_popup(str(e))
+			
+		for x in CHANGE_BUTTONS:
+			self.getobj(x).set_sensitive(True)
 
 	def refresh(self, _):
 # Does this cause a memory error? This is a GTK interned string