As serial-based PCIe bus devices, such as IEEE1394 (FireWire), become less active, it is possible for the computer's power management system to take the opportunity to reduce overall power consumption by placing the link PHY into a low-power mode and instructing other devices on the link to follow suit.
The SFF-4 is designed in a supporting role for input/output for airborne and ground vehicle control applications, supporting I/O for Ethernet, serial, video, 1553 or Canbus.
Serial communication, a method of data transmission in telecommunication and computing
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The display driver will typically accept commands and data using an industry-standard general-purpose serial or parallel interface, such as TTL, CMOS, RS232, SPI, voltage, current, timing and demultiplexing to make the display show the desired text or image.
The six conductors of the DECconnect MMJ connector are used for the main signals in RS-423 serial communication: Tx and Rx for the data transmission and DSR and DTR for handshaking.