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Features 
The RTU was designed with a wealth of features. Click here for a summary of these features.
Types of Ports
Different models have different types and numbers of ports configured. The available port types are:
 contact closure (Digital) I/O ports
latched relay output ports
analog input ports
external temperature port and sensor
internal temperature sensor
virtual input ports (under the control of Rules script)
virtual output ports (under the control of Rules script)
Communications Methods
The RTU has flexible modes of communication. The options are:
Ethernet link
serial leased line
dialup using the PSTN (telephone system) network
dialup using the GSM (mobile phone) network
dialup using the CDMA (mobile phone) network
SMS (mobile text) messages using either the GSM or CDMA networks
If Ethernet is the primary mode of communication, and a suitable modem is attached to the RTU's serial port, the RTU can be configured to automatically fall back to serial communication if it detects a failure in the Ethernet link.
Inerfaces
The RTU supports the following interfaces:
Hypertext Transfer Protocol (HTTP)
Simple Network Management Protocol (SNMP)
Simple Mail Transfer Protocol (SMTP)
Extensible Markup Language (XML)
Point to Point Protocol (PPP)
Short Message Service (SMS)
Network Time Protocol (NTP)
Pass Thru for Serial Devices
Types of Notification
When the RTU needs to send notifications of alarms and other events, it can do so in one of the following ways:
SNMP traps
SMTP (email) messages
SMS (mobile text) messages
One or more of these can be configured and used, depending on the application and attached communications equipment.
Models
There are two base models of RTU
the R32D has 32 contact closure I/O ports; one external temperature port & sensor and an internal temperature sensor; external alarm and ARA relay outputs
the R24D4L16A has 24 contact closure I/O ports; 4 latched output ports; 16 analog input ports; one external temperature port & sensor and an internal temperature sensor; external alarm and ARA relay outputs.
Each RTU can be powered by one of:
AC mains 110V-240V auto-ranging
DC, one of 12V, 24V, or 48V
If you do not need all the ports on an RTU model, it is possible to save money by buying the RTU with some of the ports disabled in firmware. It is possible to subsequently purchase individual ports and have them activated again when required.
Applications
The RTU can be deployed into sites that are either connected by Ethernet links, or that have some form of dialup capability - PSTN (normal telephone system) or CDMA / GSM (mobile network). The RTU works the same way in either case, allowing staff to manage the equipment seamlessly. RTUs can be monitored and controlled independently using the on-board web server, or several of them can be brought under the control of management software such as an SNMP manager.
Following are some of the applications of the RTU:
equipment shelters
headends
floor alarms and rack equipment
kerbside / roadside cabinets
server and equipment rooms
exchange equipment
infrastructure monitoring
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