Advanced password lock

so i'm trying to make a advanced password lock and i almost have it but there is somekind of problem that i can't understand

ok, there are 2 computers

1st is where the password is entered and the door activated here's the code :

rednet.open("back")

passex=false
function getpass()
  passex=false
  rednet.send(20,"pass")
  id,txt=rednet.receive()
	if id=="20" then
	  pass=txt
	  passex=true
	end
end

while true do
  term.clear()
  term.setCursorPos(1,1)
  print("Enter Password: ")
  input = read("*")
  getpass()
	if passex==true then
	  if input==pass then
		rs.setOutput("bottom",false)
		os.sleep(5)
		rs.setOutput("bottom",true)
	  else
		print("Wrong password")
		os.sleep(1)
	  end
	else
	  print("unable to get password")
	end
end

2nd is where the password is stored and it can be changed here's the code:

pass="sss"
rednet.open("top")
while true do
  term.clear()
  term.setCursorPos(1,1)
  event,p1,p2= os.pullEvent()
  if event=="rednet_message" then
	if p2=="pass" then
	  os.sleep(0.1)
	  rednet.send(19,pass,true)
	  print("password was told")
	  os.sleep(5)	
	else
	  print(p2)
	  os.sleep(1)
	end
	elseif event=="char" then
	if p1=="P" then
	  print("So you want to change the passowrd?")
	  print("Enter old password")
	  input=read("*")
	if input==pass then
	  print("enter new password")
	  pass=read()
	else
	  print("wrong password")
	  os.sleep(1)
	end
	else
	print(p1)
	end
end
end

i think there is a problem with the 1st computer's code becouse when i enter the code it skips everything and again prints enter password or just freezes like it would be waiting for password…

please help

Something Similar that i did

Server: http://pastebin.com/DDniwcLY

Client: http://pastebin.com/W3ppnLEH