DLV11-E and DLV11-F Asynchronous Line Interface User's Manual

This document is the User's Manual for the Digital Equipment Corporation (DEC) DLV11-E and DLV11-F asynchronous line interface modules, published in June 1977.

These modules serve as interfaces between the LSI-11 bus and various serial communication lines, converting serial data to parallel for computer input and parallel data to serial for peripheral output.

Key differences between the two models:

• The DLV11-E offers full modem control and is designed for EIA Standard RS232C and CCITT Recommendation V.24 data sets (e.g., Bell 103, 202C/D).
• The DLV11-F supports either 20 mA current loop or EIA-standard "data leads only" operation, specifically without modem control.

Common features of both modules include:

• Jumper- or program-selectable crystal-controlled baud rates (50 to 9600 baud).
• Provisions for user-supplied external clock inputs.
• Jumper-selectable parity and data bit formats.
• LSI-11 bus interface logic for interrupt processing and vectored addressing.
• Directly accessible control, status, and data buffer registers.
• Compatibility with PDP-11 DL11 series asynchronous line interface modules.

The manual provides comprehensive information on:

• Introduction, purpose, operating features, and specifications.
• General and detailed descriptions of module functions and circuit components, including the bus interface, I/O control logic, data buffers, interrupt logic, baud rate control, break logic, maintenance mode, and peripheral interfaces.
• Installation procedures, covering jumper configuration, physical module installation, and diagnostic checkout.
• Programming details, such as device registers, interrupt handling, and timing considerations, with programming examples.
• Appendices that describe the integrated circuits used within the modules and provide wire-wrap jumper instructions for modification.