Signal IAM; programming types are hardware type SIGNAL for 4008; device type SIGIAM for other compatible fire alarm control panels. Additional NAC Operation. For applications requiring additional individual NAC supervision and control, the 4090-9007 Signal IAM provides a 0.5 A remote NAC under host panel addressable point control. IDNet communications monitor the Signal IAM status and then connects the output NAC to the separate signal input for local alarm notification.