View difference between Paste ID: 6E2eVkaR and h07ZmZ6Z

 glass = peripheral.wrap("bottom")
 
 rednet.open( "back" )
 
 -- Constants
 pos_x = 40
 pos_y = 55
 pos_inc = 10
-color[on] = "0x2290000"
+color["on"] = "0x2290000"
-color[off] = "0xFF0000"
+color["off"] = "0xFF0000"
 
 -- Devices
-local devices = {Quarry}
+local devices = { "Quarry" }
 
 -- Device status
 local status = {}
 for i, device in ipairs( devices ) do
-  status[device] = glass.addText( pos_x, pos_y, device, status[off] )
+  status[device] = glass.addText( pos_x, pos_y, device, status["off"] )
   pos_y = pos_y + pos_inc
 end
 
-statusQuarry = glass.addText( 40, 55, "Quarry", 0xFF0000 )
+
   local command = ""
   local device = ""
   local status = ""
 
   senderID, message, distance = rednet.receive()
   print( senderID .. ": " .. message )
 
   for i in string.gmatch( message,  "%S+" ) do
     if not command then
       command = i
     elseif not device then
       device = i
     else
       status = i
     end
   end
 
   status[device].setColor( color[status] )
 end
 
 rednet.close( "back" )