DPV11 serial synchronous interface technical manual

This technical manual describes the DPV11 serial synchronous line interface, designed to connect an LSI-11 bus to a serial synchronous modem. It supports EIA RS-232-C, RS-423-A, and RS-422-A electrical standards, facilitating data communication for character-oriented protocols like BISYNC and DDCMP, and bit-oriented protocols like SDLC.

Key features include full or half-duplex operation, double-buffered transmitter and receiver, operating speeds up to 56K b/s, and program interrupt-driven I/O. The DPV11 incorporates an internal Universal Synchronous Receiver/Transmitter (USYNRT) chip for data serialization/deserialization, protocol handling, error detection (CRC), bit-stuffing, and programmable sync character management. It utilizes five 16-bit registers for status, control, and data buffering, accessible in word or byte mode.

The manual provides comprehensive details on installation, including jumper configurations for addressing, interface selection, and clock settings, as well as verification procedures using diagnostic software (CVDPV*, DEC/XII System Exerciser, and DCLT). Technical descriptions cover the functional blocks, logic, and component details. Maintenance philosophy emphasizes module swapping, with diagnostics and a software-selectable maintenance mode aiding fault isolation.