DZQ11-SF 4-Line Asynchronous Multiplexer Option Installation Guide

This document is the "DZQ11-SF 4-Line Asynchronous Multiplexer Option Installation Guide" (Order No. EK-DZQ11-IN-001), published by Digital Equipment Corporation in May 1987.

It serves as a comprehensive guide for Digital Field Service personnel and qualified self-maintenance customers to install the DZQ11-SF 4-line asynchronous multiplexer option kit into BA200-series microsystem enclosures.

The guide covers:

• Product Description: The DZQ11-SF is a dual-height module that connects the Q22-bus to four full-duplex serial data communication lines (RS232-C and RS423-A compatible). Each channel supports programmable baud rates (50 to 19,800) and modem control for auto-answer dial-up. It is program-compatible with Q-bus DZV11 and UNIBUS DZ11-A, but does not support 20 mA operation.
• Installation Preparation: Instructions for unpacking the kit, inspecting FCC and EOS clips for proper grounding, performing a software backup of the system (customer's responsibility), and verifying the existing system configuration against power and bus load limits using provided worksheets.
• Module Configuration: Detailed steps on setting the DZQ11-SF module's address (CSR), interrupt vector address, and modem control via onboard DIP switches, along with explanations of factory default settings.
• Physical Installation: Procedures for safely relocating existing modules (emphasizing antistatic precautions), verifying ground connections, installing necessary gap filler assemblies for FCC compliance, and finally inserting and securing the DZQ11 module.
• Post-Installation: Guidance on testing the newly configured system using diagnostic tools (MicroVAX MDM or MicroPDP-11 XXDP+ diagnostics) and connecting external devices (e.g., modems) to the module's communication ports. The document concludes by stating the customer's responsibility for bringing up the operating system software after successful installation.

Throughout the guide, a strong emphasis is placed on safety precautions, such as using antistatic wrist straps, and ensuring proper bus grant continuity and grounding.