Campbell Scientific CR1000KD CR800 and CR850 Measurement and Control Systems - Page 333
Hardware and Carrier Signal, 4.2 Protocols, 4.3 Initiating Telecommunications Callback
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Section 8. Operation 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 PC / COM or USB Direct Connect PDA / COM Port Direct Connect PC / COM Port Digital Cellular PC / COM Port Multidrop PC / Network Card Ethernet / PPP PC / COM Port Spread Spectrum RF PC / COM Port Licensed Frequency RF PC / COM Port Short-haul Telephone PC / COM Port Land-line Telephone PDA / Infrared Port Infrared Satellite System Satellite Transceiver Carrier Signal RS-232 RS-232 800 MHz RF RS-485 IP 900 MHz RF UHF VHF RF CCITT v.24 CCITT v.92 SIR RF CS Mass Storage Device Audible Report Heads-Up Display Digital Display external keyboard / display Direct Connect Land-line Telephone Direct Connect Direct Connect Direct Connect CS I/O Serial Comms Voice CS I/O Serial Comms CS I/O Serial Comms 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® 333