Campbell Scientific CR800 and CR850 Measurement and Control Systems - Manual (Page 333)

Section 8. Operation
333
8.4.1 Hardware and Carrier Signal
Campbell Scientific supplies or recommends a wide range of telecommunications
hardware. Table CR800 Telecommunications Options
(p. 333)
lists
telecommunications destination, device, path, and carrier options which imply
certain types of hardware for use with the CR800 datalogger. Information in table
CR800 Telecommunications Options
(p. 333)
is conceptual. For specific model
numbers and specifications, see the appendix Telecommunications Hardware
,
contact a Campbell Scientific applications engineer, or go to
www.campbellsci.com.
Table 79. CR800 Telecommunications Options
Destination
Device / Portal
Communications Path Carrier Signal
PC / COM or USB Direct Connect RS-232
PDA / COM Port Direct Connect RS-232
PC / COM Port Digital Cellular 800 MHz RF
PC / COM Port Multidrop RS-485
PC / Network Card Ethernet / PPP IP
PC / COM Port Spread Spectrum RF 900 MHz RF
PC / COM Port Licensed Frequency RF UHF VHF RF
PC / COM Port Short-haul Telephone CCITT v.24
PC / COM Port Land-line Telephone CCITT v.92
PDA / Infrared Port Infrared SIR
Satellite System Satellite Transceiver RF
CS Mass Storage Device Direct Connect CS I/O Serial Comms
Audible Report Land-line Telephone Voice
Heads-Up Display Direct Connect CS I/O Serial Comms
Digital Display Direct Connect CS I/O Serial Comms
external keyboard / display Direct Connect Serial Comms
8.4.2 Protocols
The CR800 communicates with datalogger support software
(p. 76)
and other
Campbell Scientific dataloggers
(p. 541)
using the PakBus
(p. 438)
protocol (PakBus
Overview
(p. 334)
). Modbus, DNP3, and Web API are also supported (see Alternate
Telecommunications and Data Retrieval
(p. 347)
). CAN bus is also supported when
using the Campbell Scientific SDM-CAN communications module.
8.4.3 Initiating Telecommunications (Callback)
Telecommunications sessions are usually initiated by a PC. Once
telecommunication is established, the PC issues commands to send programs, set
clocks, collect data, etc. Because data retrieval is managed by the PC, several PCs
can have access to a CR800 without disrupting the continuity of data. PakBus®