Section 5. System Overview
Memory for data can be increased with the addition of a CF (p. 510) card and CF
storage module (connects to the Peripheral port) or a mass storage device (thumb
drive) that connects to CS I/O or both. See the appendix Data-Storage Devices
— List
(p. 653) for information on available memory expansion products.
By default, final-data memory (memory for stored data) is organized as ring
memory. When the ring is full, oldest data are overwritten by newest data. The
DataTable() instruction, however, has an option to set a data table to Fill and
Stop.
5.3.9 Data Retrieval and Telecommunications — Overview
Related Topics:
• Data Retrieval and Telecommunications — Quickstart (p. 45)
• Data Retrieval and Telecommunications — Overview (p. 88)
• Data Retrieval and Telecommunications — Details (p. 391)
• Data Retrieval and Telecommunication Peripherals — Lists (p. 651)
Final data are written to tables in final-data memory. When retreived, data are
copied to PC files via a telecommunication link (Data Retrieval and
Telecommunications — Details
(p. 391) ) or by transporting a CompactFlash
®
(CF)
card
(CRD: drive) or a Campbell Scientific mass storage media (USB: drive) to
the PC.
5.3.9.1 PakBus® Communications — Overview
Related Topics:
• PakBus
®
Communications — Overview (p. 88)
• PakBus
®
Communications — Details (p. 393)
• PakBus
®
Communications — Instructions (p. 584)
• PakBus Networking Guide (available at www.campbellsci.com/manuals
(http://www.campbellsci.com/manuals
))
The CR1000 communicates with datalogger support software (p. 654),
telecommunication peripherals
(p. 651), and other dataloggers (p. 645) with PakBus, a
proprietary network communication protocol. PakBus is a protocol similar in
concept to IP (Internet Protocol). By using signatured data packets, PakBus
increases the number of communication and networking options available to the
CR1000. Communication can occur via TCP/IP, on the RS-232 port, CS I/O
port, and C terminals.
Advantages of PakBus are as follows:
• Simultaneous communication between the CR1000 and other devices.
• Peer-to-peer communication — no PC required. Special CRBasic
instructions simplify transferring data between dataloggers for distributed
decision making or control.
• Data consolidation — other PakBus dataloggers can be used as "sensors" to
consolidate all data into one CR1000.
• Routing — the CR1000 can act as a router, passing on messages intended for
another Campbell Scientific datalogger. PakBus supports automatic route
detection and selection.
88
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