An RY-PA relay is configured to be normally open by default. By resoldering one of the wires, the relay can be set to normally closed.
Setting an RY-PA Relay to Normally Closed
All Call to Standard LE Series Sub Stations
Eliminating Call Tone from Sub Station at LEF Master Station
Increase timing circuit of call-in LED
Installing Volume Control on LE Series Sub Station
LED Monitoring Indicator on an LE Series Sub Station
Separate Transmit and Receive Volume Controls on LEF Series Master Station
Setting an RY-PA Relay to Normally Closed
Tape Recorder Output on LEF Master Station
Using Relay Contacts with the LEF Series