CMR11/CMV11 Distributed Multiprocess Controller Pocket Service Guide

This document is the "CMR11/CMV11 Distributed Multiprocess Controller Pocket Service Guide" (EK-CMR11-PS-001), published by Digital Equipment Corporation in July 1982.

Its primary purpose is to serve as a quick-reference guide for field service engineers to troubleshoot and maintain the CMR11/CMV11 distributed multiprocess controller system, specifically down to the Field Replaceable Unit (FRU) level.

The CMR11/CMV11 system is a microprocessor-based distributed control device designed to manage and monitor a variety of Input/Output (I/O) functions from a PDP-11 host computer. It supports distributed processing over multipoint communication facilities, controlling numerous remote units (CMR01) via EIA RS-232-C interfaces or Limited Distance Modems (LDM).

The guide covers:

• Introduction: Provides a general overview, physical and functional descriptions, and specifications for the host controller (CMR11-AA/CMV11-AA for UNIBUS/Q-BUS) and the remote unit (CMR01), detailing their components and operational functions.
• Board Configurations: Outlines how system components are configured, including lists of parts, power/bus loading, and configuration variables such as device placement, addressing, baud rate selection, and cabling for both host and remote units.
• Test and Calibration: Details diagnostic and calibration procedures, including the use of the (C)ZCMJ diagnostic program and specialized test equipment, for basic unit tests, I/O module tests, and communication line adjustments.
• Corrective Maintenance: Offers guidance on general troubleshooting, diagnostic media, precautions, and technical information like register bit assignments, to aid in system repair and maintenance.