$825.00 (USA and Canada only)

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OBSOLETE SNAP Ethernet I/O Brain - Analog/Digital/Serial with Real-time Clock

Please call (800) 321-6786 to order.


Production Specification

NOTE: This is a legacy product and not recommended for new designs. For new designs, the SNAP-PAC-EB1 brain is more powerful and costs less. Or, if you require PPP communication over a modem, we recommend the SNAP-PAC-R1 on-the-rack controller.

The SNAP-ENET-RTC Ethernet I/O brain is an I/O and communications processor that connects analog, digital, and serial devices with Ethernet networks for monitoring, control, and data acquisition.

The SNAP-ENET-RTC is mounted on a SNAP B-series rack with up to 16 analog, digital, and serial SNAP I/O modules.

The only difference between this brain and the SNAP-B3000-ENET is that the RTC brain includes a battery-backed real-time clock to time-stamp email messages and data.

NOTE: Not all SNAP I/O modules are compatible with this brain. See Legacy and Current Product Comparison and Compatibility Charts to determine compatibility.


Power Requirements

5.0 to 5.2 VDC at 1.0 A maximum (does not include module power requirements)

Operating Temperature

0 to 70 °C

Storage Temperature

-40 to 85 °C


0–95% humidity, non-condensing

Network Interface

IEEE 802.3 network, 10Base-T and 100Base-TX

Serial Port

RS-232 (for modem connection using PPP; also for programming and maintenance)

Serial Data Rates

Default is 19,200 kBd; baud rate is soft-selectable from 2400 to 115,200 kBd.

Maximum Ethernet Segment Length

100 meters with Category 5 or superior UTP.
For 100 Mbps at this distance, use Category 5 or superior solid UTP.

Jumpers (Internal)

Boot to kernel/boot to loader; reset to factory defaults


SNAP Ethernet Brain Data Sheet

With Opto 22's high-performance, flexible SNAP Ethernet brains, you can connect to state-of-the-art Opto 22 industrial I/O hardware using a standard TCP/IP Ethernet connection.

SNAP Ethernet I/O Firmware README

This README file lists revision changes made to the SNAP Ethernet I/O firmware used in SNAP Ethernet brains.

SNAP Legacy Firmware README

This README file lists revision changes made to the firmware used in SNAP PAC family controllers before Version 8.0a, the SNAP-LCE controller, and SNAP Ultimate, Ethernet, and Simple brains.

Legacy Edition, PAC Manager User's Guide

This document is the Legacy Edition of the PAC Manager User's Guide. It includes information about both SNAP PAC hardware and older hardware.

Use this guide if you are using any legacy hardware (SNAP Ultimate, SNAP Ethernet, and SNAP Simple I/O, E1 and E2 brain boards) with PAC Manager.

If you are using SNAP PAC controllers and SNAP PAC brains only, use Form 1704, PAC Manager User's Guide instead of this guide.

Modbus/TCP Protocol Guide

This document shows you how to set up communication between Ethernet-based Modbus systems (using Modbus/TCP) and the SNAP PAC System. In addition to the SNAP PAC System (SNAP PAC S-series and R-series controllers and SNAP PAC brains), the guide also covers Modbus/TCP communication with older Opto 22 Ethernet-based devices, including SNAP Ethernet, SNAP Simple, and SNAP Ultimate I/O; and E1 and E2 brain boards.

OptoMMP Protocol Guide

This guide is for programmers who are writing custom applications to communicate with Opto 22 memory-mapped devices. These devices include SNAP PAC controllers and SNAP PAC EB and SB brains; G4EB2 brains; SNAP Ultimate, SNAP Ethernet, and SNAP Simple I/O; E1 and E2 brain boards, and SNAP-LCE controllers.

The guide describes how to use the IEEE 1394-based OptoMMP memory-mapped protocol for programming. The guide also contains the complete memory map for all Opto 22 memory-mapped devices.

NOTE: This guide replaced previous individual programming guides for SNAP Ultimate I/O (form #1312) and SNAP Ethernet I/O (form #1227). This document was formerly called the "SNAP Ethernet-Based I/O Units Protocols and Programming Guide."

SNAP Ethernet-Based I/O Units User's Guide

NOTE:This document describes legacy products that are not recommended for new development. For new development, we recommend SNAP PAC brains and R-series controllers.

This guide shows you how to install, use, and troubleshoot I/O units that contain the following brains: SNAP-B3000-ENET, SNAP-ENET-S64, SNAP-UP1-M64, SNAP-UP1-ADS, SNAP-ENET-RTC, SNAP-ENET-D64, and SNAP-UP1-D64.

NOTE: This guide replaces previous individual user's guides for SNAP Ultimate I/O (form #1311) and SNAP Ethernet I/O (form #1112).

ioManager User's Guide

ioManager is the software tool used to assign IP addresses and configure I/O points and system functions on most Opto 22 Ethernet-based hardware, including SNAP-LCE controllers: SNAP Ethernet, SNAP Ultimate, SNAP Simple, E1, and E2 I/O units; and SNAP-IT units. ioManager can also be used to directly read or write to these devices.

Declaration of Conformity (EMC, LVD)

This document is the Manufacturer's Declaration of Conformity for the products listed herein, in accordance with European, international, and/or national standards and regulations.

SNAP PAC System Migration Technical Note

This document describes migration options for customers integrating the SNAP PAC System with older Opto 22 systems. It explains the SNAP PAC System's similarities and differences with earlier systems, defines legacy products, and shows how to mix old and new hardware.

Customers moving to the SNAP PAC System may also want to consult form #1693, Legacy and Current Product Comparison and Compatibility Charts.

Simplified IP Addressing

Introduces you to IP addressing on an Ethernet network.

CE Declaration: Component

This document is the Manufacturer's Declaration for the listed products as mentioned in the attachment - to which this confirmation refers - that they are in accordance with the mentioned European, international and/or national standards and regulations.

CE Declaration: Low Voltage

This document is the Manufacturer's Declaration for the listed products as mentioned in the attachment - to which this confirmation refers - that they are in accordance with the mentioned European, international and/or national standards and regulations.

SNAP-ENET-RTC Brain Firmware

This download contains current firmware for the SNAP-ENET-RTC brain.

OptoAgent Integration (for CA Unicenter NSM 3.1)

OptoAgent Integration for CA Unicenter, in conjunction with Opto 22 SNMP-enabled Ethernet hardware, provides a convenient method for monitoring and managing real-world devices and business assets. OptoAgent allows for real-world data to be integrated into Unicenter.


The OptoAgent Integration supports both SNMP traps and polling to keep Unicenter updated on the current state of the hardware, and alert Unicenter of any problems. It also gives the user the ability to control the Opto 22 hardware.

OptoAgent Integration takes advantage of Unicenter Agent technology to graphically represent the Opto 22 hardware to the user. This Graphical User Interface (GUI) makes monitoring and managing real-world assets intuitive.

OptoAgent gives you the ability to read and write digital and analog I/O points that are attached to the Opto 22 hardware. These I/O points are connected to real-world electrical, mechanical, and electronic devices - such as lights, temperature and pressure sensors, motors, and serial devices. Using Unicenter, OptoAgent, and Opto 22 hardware, you can manage these real-world devices.

You can use ioManager software to configure the Opto 22 hardware and I/O points for use with OptoAgent. You can also configure OptoAgent to send SNMP traps based upon events you define.

Once the Opto 22 hardware and I/O points are configured, you can use OptoAgent View to see information about the Opto 22 hardware and the status and values of digital and analog I/O points.

SNAP Ethernet I/O BootP Server - Linux

A BootP server for configuring the IP address of the SNAP Ethernet brains and the M4SENET-100 adapter card.

Before you download, read the Legal Agreement.

No videos or demos are available for this product.