Optimation's OptiLogic Remote Terminal Unit provides point of use I/O and 
operator panel capabilities with a high speed link to a PC.  OptiLogic delivers the highest levels of flexibility, ease of use and performance at the lowest cost of any PC-based distributed I/O subsystem on the market.
The OptiLogic Remote Terminal Unit (RTU) is modular in design.  It allows you to plug together any combination of analog and digital inputs and outputs that will fit in the available slots.  The card cage base snaps onto a standard DIN rail for back panel mounting.  If an  operator panel is required, the base 
snaps onto any variety of available OptiLogic operator panels, which can in 
turn be panel mounted.  The Ethernet connection provides a 10BaseT connection to the network.
A System built with OptiLogic RTUs allows you to monitor and control equipment and systems spread throughout a building.  A PC with a standard Ethernet connection can serve as the central controller.  Input data, output control and operator panel operation are only a millisecond response away.
If you are a software professional, you can easily develop your own software 
to run on the PC and interface OptiLogic RTUs.  A Software Development Kit is available for such purposes.
If you are not a software professional, or you are looking for a more efficient 
way to develop your application, easy to use development packages are available from companies such as Think & Do. 

Features
Modular design, card cage based system
10BaseT Ethernet communications
Variety of digital I/O and analog I/O modules available
Variety of snap-on operator panels available
(only RTU on the market with operator panels)
Specialty module for specific functions available for plug-in application
DIN rail or panel mount
Snaps together to create a single-piece RTU
Easy to use SDK available
Compatible with easy to use graphical programming packages, such as Think&Do

Benefits
Extreme flexibility
Low cost
High speed I/O for PC-based applications
Easy to configure and use
Reduces system integration and retrofit costs
Attractive, eye-appealing appearance

OptiLogic Base Description
The figure above shows an OptiLogic Ethernet RTU base.  The particular base shown is a 4 slot base.  (Bases with different numbers of slots are available and have the same basic features.)  An OptiLogic Ethernet RTU base consists of a card cage containing an OptiLogic motherboard.  The base unit has a built in Ethernet port, as well as an RS232 port.  The OptiLogic Base mounts by snapping onto a standard DIN rail, or by snapping onto the DIN rail built into OptiLogic operator panels.  When attached to an OptiLogic operator panel, the complete assembly can then be panel mounted.  I/O and specialty modules plug into the available slots in the OptiLogic base.

Physical (RTU Base)
DIN rail mount to 35mm DIN rail
Overall dimensions (OL4054)
4.95"L x 3.25"H x 3.00" D
Color : Dark gray

Electrical
Power :  8 - 30 VDC input power
Minimum load current (no I/O boards or operator panel attached)
75mA   @ 24VDC
150mA @ 12VDC
Maximum load current (actual depends on the particular modules attached)
700 mA @ 24VDC
1.4A @ 12VDC
Power Connection : Terminal block, 2 terminal

Communications

Ethernet
Type : 10Base-T ethernet
Data Rate : 10 Mbps
Connection : RJ45
Ethernet Protocols : IPX, TCP.IP

RS232 Port
Baud rates : 300, 1200, 2400, 4800, 9600, 19.2K (selectable)
Data bits : 7 or 8 (selectable)
Parity : odd, even, or none (selectable)
Stop bits : 1 or 2 (selectable)
Connection : RJ12