The CCSI Wireless Data Collection Network is a self-organizing, self-repairing, power optimized mesh network. Data is collected from sensors and/or devices (e.g. PLC's, RTU's, flow computers) attached to each unit and automatically routed to a central collection point where it is archived and made available to host devices supporting Modbus or A-B DF-1 protocol. There are three types of units in the network:
- Data collection unit (Model Number 915-1000-0-DCU).
- Primary terminal units (Model Number 915-1000-0-PRI).
- Secondary terminal units (Model Number 915-1000-0-SEC).
A network is composed of one Data Collection Unit (DCU), at least One Primary Terminal Unit (PTU), and, optionally, one or more Secondary Terminal Units (STU). A total of 150 Primary or Secondary Units are supported by one DCU. PTUs and STUs are used to monitor and record data from connected analog sensors and discrete switches, as well as any device that supports Modbus or Allen-Bradley DF-1 protocol via an RS-232 serial interface.
STUs discover and associate themselves with the neighboring PTU that has the best signal strength. The STU then transmits its data when polled by a PTU, which can be as often as once per minute or as infrequently as once per day.
PTUs aggregate data from any associated secondary units, along with their directly connected sensor and polled device data, and transmit the combined data report to the DCU. The primary reporting interval can also be anywhere from once per minute to once per day. If a PTU is not within range of a DCU, it will automatically route its report through neighboring PTUs in order to reach the DCU. In addition to scheduled reports, both PTUs and STUs can be configured to transmit a report whenever a user-defined exception occurs.
At the DCU, all the network data is archived in flash memory, and the most recent report data is made available via a serial communications port using industry standard Modbus or DF-1 protocols.
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