Generic ASCII Serial Enhanced Communication Module


The Generic ASCII Serial Enhanced Communication Modules allow Rockwell Automation ControlLogix Programmable Automation Controllers (PACs) to easily interface with serial devices using non-specific ASCII character text string or byte value serial communication protocols.

MVI56E-GSC enhancements include local and remote diagnostics through the module's Ethernet port, CIPconnect technology for bridging through Rockwell Automation ControlNet and EtherNet/IP networks, and an on-board web server containing status information, module documentation, and sample program files.

The MVI56E-GSC module is a fast and easy way to add two fully configurable serial communication ports to the ControlLogix platform, eliminating the need to use the front port of the processor or to consume valuable processing time sending and receiving serial messages.

The module is a single-slot, backplane-compatible solution. Each port is capable of sending and receiving large ASCII character strings or byte streams of up to 4096 characters or bytes. Many different serial communication devices can be integrated into the ControlLogix platform by building upon the sample ladder logic provided for this module.

A conformal coating option is available for this product.


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Features and Benefits




  • MVI56E products are backward-compatible with existing ladder logic, allowing for a smooth transition when upgrading from the earlier version MVI56-GSC product.

RSLogix 5000 Integrated

  • Module communication is integrated within RSLogix 5000 using a sample Add-On Instruction (AOI), or sample ladder logic file
  • The module is configured with the sample ladder logic controller tags

ProSoft Configuration Builder Graphical User Interface Software

  • Provides online diagnostics using the high-speed Ethernet port
  • CIPconnect-enabled, allows remote diagnostic access across multiple bridged EtherNet/IP and ControlNet networks using Rockwell Automation 1756-ENxT and 1756-CNB network interface modules

Web-enabled Ethernet port with Discovery Service

  • Module's built-in Ethernet port provides a web server for local access to documentation, module status, and firmware updates
  • ProSoft Discovery Service, a software utility to locate MVI56E modules on the network and assign a temporary IP address for easy configuration


  • Backward-compatible with previous MVI56-GSC version
  • Single Slot - 1756 ControlLogix backplane compatible
  • 10/100 MB Ethernet port for network configuration and diagnostics with Auto Cable Crossover Detection
  • User-definable module data memory mapping of up to 5000 16-bit registers
  • CIPconnect-enabled network diagnostics and monitoring using ControlLogix 1756-ENxT modules and EtherNet/IP pass-thru communications
  • Sample Ladder Logic or Add-On Instruction (AOI) used for data transfers between module and processor and for module configuration
  • Internal web page providing access to product documentation, module status, and firmware update software
  • 4-character, scrolling LED display of status and diagnostic data in plain English
  • ProSoft Discovery Service (PDS) software finds the module on the network and assigns a temporary IP address to facilitate module access




Backplane Current Load

800 mA @ 5 V DC3 mA @ 24 Vdc

Operating Temperature

0°C to 60°C (32°F to 140°F)
-25°C to 70°C (-13°F to 158°F)

Storage Temperature

-40°C to 85°C (-40°F to 185°F)


30g Operational
50g non-operational
Vibration: 5 g from 10 to 150 Hz

Relative Humidity

5 to 95% (without condensing)

LED Indicators

Battery Status (ERR)

Application Status (APP)

Module Status (OK)

4-Character, Scrolling, Alpha-Numeric LED Display

Shows Module, Version, IP, Port Master/SlaveSetting, Port Status, and Error Information

Debug/Configuration Ethernet port (E1 - Config)

Ethernet Port

10/100 Base-T, RJ45 Connector, for CAT5 cable

Link and Activity LED indicators

Auto-crossover cable detection

Serial Application ports (P1 & P2)

Full hardware handshaking control, providing radio, modem, and multi-drop support

Software configurable communication parameters

Baud rate: 110 baud to 115.2kbps

RS-232, 485 and 422

Parity: none, odd or even

Data bits: 5, 6, 7, 8

Stop bits: 1 or 2

RTS on/off delay: 0 to 65535 milliseconds

Serial Applications Ports (P1, P2)

RJ45 (DB-9M with supplied adapter cable)

Configurable RS-232 hardware handshaking

500V Optical isolation from backplane

RS-232, RS-422, RS-485 jumper-select, each port

RX (Receive) and TX (Transmit) LEDs, each port

Shipped with Unit

RJ45 to DB-9M cables for each serial port

5 foot Ethernet Straight-Thru Cable (Gray)


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