CXY08-AF 8-Line Asynchronous Multiplexer Option Installation Guide

This document is an Installation Guide for the CXY08-AF 8-Line Asynchronous Multiplexer Option by Digital Equipment Corporation, published in May 1987.

Key Information:

• Purpose: Provides detailed information and step-by-step procedures for installing the CXY08-AF module kit into BA200-series Micro system enclosures (6- or 12-slot, Q-bus).
• Target Audience: Primarily Digital Field Service personnel and qualified self-maintenance customers who possess specific MicroVAX or MicroPDP-11 System Maintenance Kits.

• Product (CXY08-AF):

  • A quad-height asynchronous multiplexer module.
  • Provides eight full-duplex serial data channels with modem control for autoanswer dial-up operation.
  • Each channel is programmable for various baud rates (50 to 38,400 bits/s), though the two highest speeds are not software-supported.
  • Supports DHV11 and DHU11 programming modes, with DHU11 being the preferred and factory-set default.
  • Complies with EIA/CCITT EIA-232-D/V.24/V.28 standards.

• Installation Process:

  1. Unpacking & Inspection: Verify kit contents (module, splitter cables, filler panel kit, guide) and inspect for damage and proper FCC/EOS clip condition.
  2. Preparation: Perform a software backup (customer responsibility), check system configuration against power and bus load limits using provided worksheets, and verify proper anti-static precautions are taken.
  3. Configuration: Configure the CXY08-AF module by setting its CSR address, interrupt vector, and programming mode (DHV11/DHU11) via onboard DIP switches. The guide details factory default settings.
  4. Module Relocation: Provides procedures for removing existing modules (with handles or blank covers) if space or priority adjustments are needed, emphasizing antistatic measures.
  5. Ground Connections: Crucially, ensures FCC compliance by instructing on the use of gap filler assemblies between modules (especially between recessed-handle modules and blank covers/flush-handle modules) to prevent exposed circuitry and maintain ground.
  6. Module Installation: Step-by-step guidance for inserting and locking the CXY08-AF module, ensuring bus grant continuity and securing all modules.

• Testing & Post-Installation:

  • Details diagnostic testing procedures for MicroPDP-11 (using XXDP+) and MicroVAX systems (using MDM) to confirm correct functionality.
  • Instructions for connecting external devices via the provided cables after successful testing.
  • States that bringing up the operating system software is the customer's responsibility.

• Appendices/References: Includes a cable assembly pin-out table (BC19N-12) and lists associated technical manuals and maintenance guides for further information.

The document stresses safety precautions (antistatic measures) and compliance requirements (FCC grounding, bus continuity) throughout the installation process.