Embedded Computers Allied Data Systems

Embedded Computers * Military and Avionic Data Bus Interfaces * Industrial Interfaces * PC/104

Sealevel manufactures Distributed I/O products with Ethernet, WiFi, USB and serial interfaces as well as PCI and PCIe.

RTD manufactures PC/104.

DDC manufactures avionic interfaces and synchro/resolver interfaces both of which have discrete interfaces included

Discrete I/O - card based or distributed

Discrete Interfaces come in two basic formats. They are either an additional part of a computer and are therefore plugged into the computer as a PCI, PCIe for desk top or rack mounted or PC/104, PC/104+, PCI/104 and PCIe/104. The other format is as distributed I/O. In this case the I/O is housed in a separate box and interfaces to the computer via a standard interface. Sealevel have also added (due to the lack of PCI ports) the ability to have USB portholes. These are Discrete I/O with USB interfaces that can be installed inside a desktop PC.

Discrete-I/O on a PCB

Sealevel is our supplier of desktop and rack mount interfaces computer interfaces. They include relay outputs and isolated inputs in many formats for PCI and PCIe. Sealevel also has some PC/104 interfaces.

Distributed I/O

RTD is our supplier of the PC/104 form factor that includes PC/104, PC/104 plus, PCI/104 and PCIe/104. All RTD hardware is specified for operation from -40 to +85 Deg C. It can also be mounted in the IDAN series of rugged housings.

PC/104 Discrete I/O

Many of DDC's products also have discrete inputs and outputs. DDC's PC/104 Synchro boards, manufactured by us for DDC include discrete I/O as many of the applications, such as measuring the position of a satellite dish, also require control as well. These discrete I/O can therefore be used to turn motors on and off or detect when a satellite dish has reached the end or travel for example.

Distributed I/O

Distributed I/O as indicated before is where the I/O is located some distance (or at least outside of) the computer controlling it. It uses USB, Ethernet, WiFi or serial such as RS 485 or RS232 to control it. Sealevel's distributed I/O products utilise the standard factory automation protocol MODBus. They also have the ability for expansion using RS485, hence even though for example, you may have a computer in a control room which is required to monitor the status of the air conditioning plant on the roof of a high rise, the Sealevel box can be connected through an Ethernet and additional Sealevel I/O can be connected to the local port of the Ethernet distributed I/O via RS 485.


In many Data Centres the APC NetBOTZ provides a means of monitoring and control of the UPS and other functions within the centre such as cooling and alarms. However the NetBOTZ is limited in its I/O. To solve this the NetBOTZ has the ability to interface to a number of Sealevel's USB Distributed I/O. Talk to us about your requirements and we will endeavor to assist you.

Embedded Computing with I/O

Both RTD and Sealevel manufacture embedded computing solutions. RTD's is based around the PC/104 series of standards and is plug and play in that the user can buy a CPU and any number of different I/O and plug it together. They can then use the operating system of their choice and write their software to perform whatever the function is that they require.

Embedded Computing with I/O built inEmbedded Computing

Sealevel however has the R9. This is a small Arm 9 CPU board that has discrete I/O and Analog inputs and encoder inputs. The system comes supplied with Win CE and the user programs it using the Dotnet framework and VB or C#. We at Allied have used the R9 and we have developed a scripting language that makes simple I/O function even simpler for the user. Talk to us if this is of interest to you.