The DT-55 telephone remote control answers a phone line, accepts a user determined access code, then allows remote control of ten SPDT relays and the remote monitoring of ten external switch contacts or logic levels.
The relays are magnetic latching. On power loss and restoration, the relays can retain their prior states or return to the deactivated state (your choice). Each relay can be set, cleared or activated momentarily (for the duration of the push-button actuation on the calling telephone). Additionally, the DT-55 can be set up to act in an interlocking mode. When a button is pressed, its associated relay is set and all other relays are cleared.