Emerson / Motorola SIM232DTE EIA-232-D DTE Serial Port Interface Module

The Emerson/Motorola SIM232DTE is an EIA-232-D DTE serial port interface module that enables standard serial communication between data terminal equipment and DCE devices. This interface module provides dual asynchronous serial ports, a parallel port, and Ethernet connectivity, making it suitable for VME-based systems requiring multi-protocol serial connectivity and network integration.

## Technical Specifications

**Protocol & Standards**
• EIA-232-D protocol with DTE (Data Terminal Equipment) configuration
• Dual EIA-574 asynchronous serial ports, each configurable for EIA-232-D, EIA-530, V.35, or X.21 operation
• IEEE Standard 1284-I compliant parallel port
• 10Base-T/100Base-TX Ethernet interface

**Electrical Characteristics**
• Signal voltage: marking condition (binary 1) –3V to –15V; spacing condition (binary 0) +3V to +15V relative to signal ground
• Maximum cable length: approximately 15 to 20 meters (dependent on cable capacitance, max 2500 pF load)
• Data rates: up to 8 kbit/s per EIA-232-D revision specification; higher rates (up to 115,200 bit/s) achievable with specific implementations
• Flow control support: none, hardware, xonxoff methods

**Physical Interface**
• Two 60-pin Serial Interface Module (SIM) connectors
• Standard D-subminiature connectors (DB25 or DE9 type)
• DTE male connector configuration

## Key Features

• Configurable asynchronous serial ports for multiple interface standards
• Integrated parallel port for printer and peripheral connectivity
• Dual Ethernet capability for network-connected systems
• Compatible with EIA-232-D voltage specifications and timing requirements
• Supports multiple flow control protocols for robust data exchange

## Compatibility & Integration

The SIM232DTE interfaces directly with MVME761 Transition Modules and VME-series backplanes via its dual 60-pin SIM connectors. This architecture suits embedded systems, industrial controllers, and legacy equipment migration where serial and parallel I/O consolidation is required alongside Ethernet connectivity.