The RB1 relay board converts the O/C output from the LCD displays and L746 Overdoor light into 'Normally open' and 'Normally closed' contact sets. The unit may also be configured by the fatory to provide time delays for some door applications. It may aksi be used to trigger a call point from an external voltage (e.g. door bell etc.). The unit is fitter with a 'T' 12v output which may be usedto drive low current devices from the newtork.