MIL-STD-1553 functionality is provided by an Aeroflex UTMC SÁMMIT protocol processor. Once configured by software, the SÁMMIT runs autonomously, handling messages without further host intervention. In Bus Controller mode, frame timing, retries, and exception processing are all programmable and handled automatically. In Remote Terminal mode, subaddresses and mode codes may be selectively illegalized during initialization. Messages may be buffered in an indexed 256-message buffer or in a ping-pong double buffer on a subaddress-by-subaddress basis. A record of interrupts is maintained in an interrupt log list. When in Monitor mode, the PM1553-1 records a time-tagged command and data history of bus traffic to and from all or selected terminals.
The PM1553-1 may be used in MIL-STD-1760 systems, which require connector-programmable RT addresses and fast initialization. Jumpers enable this capability, and the EEPROM provides the autoinitialization data. The five RT address lines and the required address parity are inputs to a connector on the PM1553-1.