MOTOROLA MVME715P Rear Transition Module

Features:

VME Connector

(4) Female DB-25 Connectors

SCSI Printer Connector

The Motorola MVME715P Rear Transition Module is a VME module with four female DB-25 connectors and a SCSI printer connector.

Manufacturer    Emerson / Motorola

Model    MVME715P

Product Family    MVME715P, MVME 715P, MVME-715P, MVME715 P, MVME 715 P, MVME-715 P, MVME715-P, MVME 715-P, MVME-715-P

MOTOROLA MVME715P Rear Transition Module

Introduction

The MOTOROLA MVME715P is a specialized Rear Transition Module (RTM) designed for the VMEbus architecture.

It acts as the physical interface bridge for VME-based single-board computers (SBCs), routing internal signals to standard external connectors.

By offloading I/O connections to the rear of the chassis, the MVME715P simplifies cable management and enhances system modularity,

 making it a staple in legacy industrial control, aerospace, and telecommunications infrastructure.

Technical Parameter Table

Parameter    Specification

Manufacturer    Motorola (now supported by Emerson/Artisan)

Model    MVME715P

Form Factor    Standard 6U VME Transition Module

I/O Connectors    4x Female DB-25 (Serial/RS-232)

Storage Interface    1x SCSI Printer/Peripheral Connector

Bus Compliance    VMEbus ANSI/IEEE 1014-1987

Dimensions    Approx. 263mm x 138mm x 88mm

Weight    ~2.35 kg (including packaging)

Operating Temp    0°C to 55°C (32°F to 131°F)

Humidity    5% to 95% (Non-condensing)

Power Supply    Draws from VMEbus backplane

Related Models

MVME162 Series: Often paired with the MVME715P for embedded control.

MVME147 / MVME167: High-performance MPU modules utilizing RTMs for I/O.

MVME712M: A similar transition module with different port configurations (e.g., SCSI/Ethernet).

MVME715: The standard version without the "P" specific configuration.

Application Cases

Legacy Power Plant Control: Used in DCS (Distributed Control Systems) to interface CPU boards with peripheral serial printers and logging devices.

Military Simulation Systems: Providing stable RS-232 communication channels for cockpit simulation and data telemetry.

Semiconductor Manufacturing: Integrated into VME racks for wafer processing equipment that requires high-reliability SCSI storage interfacing.

Telecommunications Switching: Managing rear-access cabling in high-density rack environments.

Product Advantages and Features

Rear Access Efficiency: Allows for clean "front-loading" of CPU boards while keeping bulky I/O cabling permanently fixed at the rear.

High-Density Connectivity: Consolidates four DB-25 serial ports and a SCSI interface into a single 6U slot.

Rugged Reliability: Built to Motorola’s industrial standards, featuring high vibration resistance and gold-plated VME connectors.

Seamless Integration: Fully passive or semi-passive design ensures minimal signal latency between the CPU and external peripherals.

SCSI-II Support: Enables easy connection to external hard drives or legacy tape drives for system backups.

Installation and Maintenance

Installation: The module must be inserted into the rear side of the VME backplane, directly opposite the master CPU module. Ensure the pins are aligned before applying pressure to avoid bending.

Grounding: Ensure the VME chassis is properly grounded to prevent EMI (Electromagnetic Interference) and protect against ESD during cable swaps.

Maintenance: Regularly inspect the DB-25 pins for oxidation. If used in high-vibration environments, use screw-locks for all connected cables to prevent accidental disconnection.

Unique Product Description

The MOTOROLA MVME715P is more than just a connector board; it is the "nervous system" exit point for high-reliability VME systems.

In an era where modern hardware shifts toward USB and wireless, the MVME715P remains a critical spare part for industries that rely on the rock-solid stability of RS-232 and SCSI protocols. 

Its design focuses on "zero-downtime" maintenance, allowing engineers to swap front-end processing cards without ever disturbing the intricate wiring looms at the back of the cabinet.

Other Models in the Same Series

MVME162-210 (Embedded Controller)

MVME172 (High-Performance VME Processor)

MVME374-1 (Ethernet Controller Board)

MVME147S-1 (MPU VME Module)