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The Modified Modular Jack (MMJ) is a small form-factor serial port connector developed by Digital Equipment Corporation (DEC). It uses a modified version of the 6P6C modular connector with the latch displaced off-center so standard modular connectors found on Ethernet cables or phone jacks cannot accidentally be plugged in. MMJ connections are used on Digital minicomputers, such as the PDP-11 ...
It is based on RS-232 serial communications at 9600 bit/s, 8N1, no flow control typically though a DE-9 connector, but can also be on 8-Pin DIN, RJ45 and RJ11 connectors used in daisy chain configurations. [1] VISCA utilizes a serial repeater network configuration to communicate between the PC (device #0) and up to 7 peripherals (#1 through #7).
An interrupt function to the host microprocessor. An on-chip FIFO buffer for both incoming and outgoing data; this gives the host system more time to respond to an interrupt generated by the UART, without loss of data. Both the computer hardware and software interface of the 16550 are backward compatible with the earlier 8250 UART and 16450 UART.
For example, telephone cables in the UK typically have a BS 6312 (UK standard) plug at the wall end and a 6P4C or 6P2C modular connector at the telephone end: this latter may be wired as per the RJ11 standard (with pins 3 and 4), or it may be wired with pins 2 and 5, as a straight-through cable from the BT plug (which uses pins 2 and 5 for the ...
Cables sold as RJ11 (the name of a single-jack, not a cable) often actually use 6P4C connectors (six positions, four contacts). Two of its six possible contact positions connect tip and ring of a single telephone line, and the other two contact positions may be unused, carry a second line, or provide low-voltage power for night light or other ...
AUI Connectors. The male connector (left) is on the MAU and the female connector (right) is on the DTE device (typically either a computer or an Ethernet hub). Note the sliding clip. AUI Connector with numbered pins on the DEC EtherWorks LC (DE100) Ethernet controller. Note the jackposts (as opposed to a sliding clip).
A male D-subminiature connector used for an RS-232 serial port on an IBM PC compatible computer along with the serial port symbol. A serial port is a serial communication interface through which information transfers in or out sequentially one bit at a time. [1]
The distance between the circuit to be programmed and the computer is limited by the length of USB cable - it must usually be less than 180 cm. This can make programming devices deep in machinery or cabinets a problem. ICSP programmers have many advantages, with size, computer port availability, and power source being major features.