This manual provides comprehensive guidance for the MVME712 family of transition modules (including MVME712A, MVME712AM, MVME712-12, MVME712-13, and MVME712B) and the LCP2 Adapter Board. It covers general product information, hardware preparation steps, installation instructions, and support details.
MVME712 Family Transition Modules & LCP2 Adapter Board: User Manual Introduction
This manual provides comprehensive guidance for the MVME712 family of transition modules (including MVME712A, MVME712AM, MVME712-12, MVME712-13, and MVME712B) and the LCP2 Adapter Board. It covers general product information, hardware preparation steps, installation instructions, and support details. A reference table (to be provided) defines key terms and abbreviations used throughout the document for clarity.
Core Function & Compatibility
1. MVME712 Family Modules
The MVME712x modules (MVME712A, AM, -12, -13) serve as a critical interface between MVME1xx family VMEmodules (e.g., MVME167, MVME197) and their internally connected SCSI peripheral devices. They facilitate signal routing and connectivity for serial, printer, and (in select models) modem functions.
2. MVME712B Module
The MVME712B is a specialized variant designed for external connectivity—it must be used in conjunction with an MVME712x board (e.g., MVME712A, AM) to enable external SCSI and/or Ethernet connections. It extends the MVME712x’s capabilities beyond internal peripherals to external devices.
3. LCP2 Adapter Board
An LCP2 adapter module and 配套 (supplied) cable are required for interconnection between MVME712 family modules (MVME712x, MVME712B) and MVME1xx family VMEmodules. It acts as a signal hub to transmit data between the two device families.
Features of the MVME712 Family Modules
The MVME712 family combines versatile connectivity, built-in peripherals, and environmental protection. Key features vary by model (noted below):
Feature
Description
Applicable Models
Four EIA-232D Serial Ports
9-pin multiprotocol ports (signal routing via LCP2 adapter) for serial communication.
All MVME712x (A, AM, -12, -13)
Independent Printer Port
Dedicated port for printer connectivity (signal routing via LCP2 adapter).
All MVME712x (A, AM, -12, -13)
External SCSI Interface
Shielded SCSI connector (signal routing via LCP2 adapter) for connecting to external SCSI devices.
MVME712B only
External Ethernet Interface
Port for external network connectivity (signal routing via LCP2 adapter).
MVME712B only
Built-in Modem
Integrated modem with front-panel Telco modular jack (for telephone line connectivity). Refer to Appendix A for details.
MVME712-13, MVME712AM only
Environmental Protection
– ESD Protection: Guards front-panel ports against electrostatic discharge damage.
– RFI Protection: Reduces radio frequency interference to ensure stable signal transmission.
All MVME712 family (A, AM, -12, -13, B)
Features of the LCP2 Adapter Board
The LCP2 Adapter Board is essential for signal management and power support between MVME712 family modules and MVME1xx VMEmodules. Its key features include:
Dual SCSI ConnectivityA 50-pin connector enables SCSI cable connections to:
Other external SCSI devices;
The MVME712B via a flat ribbon cable.
Flexible SCSI TerminationSCSI terminating resistors are mounted in sockets, supporting both “end-of-cable” and “middle-of-cable” configurations for the SCSI bus—adapting to different system setups.
Terminator Power SupplyGenerates terminator power from the +5 Vdc source on the P2 connector (of the MVME1xx VMEmodule’s chassis backplane). A 1-amp fuse is integrated on the LCP2 adapter for overcurrent protection.
Unified Signal InterfaceA 64-pin connector aggregates and transmits signals for the EIA-232D serial ports and printer port to the MVME712x module—simplifying the interconnection chain.
Cooling Requirements
Motorola VMEmodules (including MVME712 family and LCP2 Adapter Board) are designed and tested for reliable operation under specific thermal conditions. Adhering to these requirements is critical for performance and longevity:
1. Rated Operating Temperature Range
Incoming air temperature: 0 °C to 55 °C (32 °F to 131 °F)
Requires forced air cooling (natural convection alone is insufficient).
2. Test Configuration (for Reference)
Temperature qualification is conducted in a standard Motorola VMEsystem 1000 chassis with:
25-watt load boards inserted in the two card slots adjacent to the test board (simulating high power density).
Three axial fans (71 CFM per fan) placed directly under the MVME card cage.
Incoming air temperature measured at the point where airflow first contacts the test module.
Test software running during ambient temperature variations, with critical IC case temperatures monitored to avoid exceeding vendor specifications.
3. Minimum Airflow Requirement
5 CFM (cubic feet per minute) of airflow over the module is typically sufficient for cooling, assuming ambient temperatures stay within the 0–55 °C range.
Adjustments for ambient conditions:
Lower ambient temperatures (below 55 °C) allow for reduced airflow.
Higher ambient temperatures (above 55 °C) may require increased airflow to maintain reliable operation (note: this is not a rated condition and depends on system-specific factors).
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