StorageWorks Solutions 8-Bit I/O Module (BA35X-MG) User's Guide

This document describes the 8-Bit I/O Module (BA35X-MG), a component for the BA356 shelf within the StorageWorks™ Building Blocks (SBB) series. It serves as a user's guide covering its features, installation, and SCSI address configuration.

Key Features and Functions:

• Bus Management: Provides external connections for two 16-bit shelf buses (Bus A and Bus B) via 50-pin female connectors (JA1 and JB1).
• Termination: Offers active termination for the lower 8 bits of Bus B and passive termination for the upper 8 bits of both buses. Active termination on JB1 is disabled when connected to an external SCSI device.
• SCSI Addressing: Determines shelf device SCSI addresses based on whether an address jumper (J5) is installed or not, supporting both single and dual bus configurations.
• Environmental Monitoring: Includes ambient air overtemperature sensing and indication, blower fault indicators, and blower speed control to regulate shelf temperature.
• Warm Swap: Supports warm swapping, allowing removal or insertion while the system is powered on.

Installation and Configuration:

• The module installs on the right side of the BA356 shelf, next to slot 0.
• SCSI addresses are configured by setting the J5 address jumper on the module's rear.
• Bus termination is either handled internally by the I/O module (for single bus configurations or when JB1 is not connected) or requires an optional terminator module in shelf slot 6 (for dual bus configurations).
• The document details various compatible BN21H-, BN21R-, BN23G-, BC10U-, and BN31B-series SCSI cables and their maximum supported lengths for connecting to other SBB shelves, SCSI adapters, and host controllers.
• Installation involves pressing mounting tabs, inserting the module into the shelf slot until it snaps into place, connecting cables (JA1 and JB1), and verifying LED status after power-up. Proper module orientation is crucial.
• It emphasizes the importance of ensuring the host controller provides "term-power" for SCSI operation.