View source for DL11-W serial line unit/real-time clock option

[[Image:M7856DL11-W.jpg|300px|thumb|right|DL11-W card]]

The '''DL11-W serial line unit/real-time clock option''' was a [[UNIBUS]] [[peripheral]] which combined a [[DL11 asynchronous serial line interface|DL11]] (a single [[asynchronous serial line]]) and a [[KW11-L Line Time Clock|KW11-L]] ([[line time clock]]) in a single [[DEC card form factor|quad]] format card ('''M7856''').

The [[register]] [[address]]es, [[interrupt vector]], input and output [[baud rate]] (speeds of 110 to 9600 baud are supported), [[character]] size, [[parity]], number of 'stop' bits, and [[20mA current loop serial line interface#'Active' and 'passive' modes|20mA active/passive]] selection are all selected by setting [[Dual Inline Package|DIP]] switches on the card.

Line connection was via a 40-pin [[Berg connector]] header on the top edge of the card, using the standard [[DEC asynchronous serial line pinout]]. It provided both [[20mA current loop serial line interface|20mA]] and [[EIA RS-232 serial line interface|EIA RS-232]] connectivity. The type of line signalling used is selected by the kind of cable plugged in (as on the DL11).

It mounted in an [[Small Peripheral Controller|SPC]] slot; to use the EIA interface, the slot must have +15V power [[voltage]] available, which is not automatically true of all backplanes with SPC slots. For the LTC to be useable, the LTC L [[signal]] (not a standard UNIBUS signal, although it is provided in the standard [[DEC power distribution connectors]]) from the system's [[power supply]] must be provided to the selected slot.

Unlike the DL11-E, it did not provide any [[modem]] control.

==External links==

* [http://www.bitsavers.org/pdf/dec/unibus/EK-DL11W-OP-001_May77.pdf DL11-W serial line unit/real-time clock option user's manual] (EK-DL11W-OP-001)
* [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/EK-DL11W-TM-002%20DL11-W%20Serial%20Line%20Unit&Real-Time%20Clock%20Option%20Technical%20Manual.pdf DL11-W Serial Line Unit/Real-Time Clock Option Technical Manual] (EK-DL11W-TM-002)
* [http://www.bitsavers.org/pdf/dec/unibus/MP00106_DL11-W_Aug77.pdf DL11-W Field Maintenance Print Set] (MP00106)

[[Category: UNIBUS Peripherals]]
[[Category: UNIBUS Asynchronous Serial Interfaces]]