Supervisory Circuit with Watchdog, Manual Reset, and Active-Low/Open-Drain
High Speed, 5 V, 0.1 µF CMOS RS-232 200kBPS Transceiver with 2 Drivers, 2 Receivers, Shutdown and Enable Pins

Microprocessor Supervisor with Backup Battery Switchover, Adjustable Low Line Voltage Monitor, Adjustable Watchdog Timer, Low Line, Power Fail and Watchdog Status Outputs and 100mA Output Current

5 V, Slew-Rate Limited, Low Power, 250 kbps, Full Duplex EIA RS-485 Transceiver
IC TRIPLE LINE TRANSCEIVER, PDIP24, PLASTIC, MO-095AG, DIP-24, Line Driver or Receiver

Nanahoshi Kagaku NJC-2410-ADM, 10 Pole Female Straight Cable Mount Circular Connector, Shell Size 24,Male Contacts

Nanahoshi Kagaku, 16 Pole Cable Mount Connector Socket, 24 Shell Size, Male Contacts

Nanahoshi Kagaku, 12 Pole Cable Mount Connector Socket, 20 Shell Size, Male Contacts