Campbell Scientific CR1000KD CR1000 Measurement and Control System - Page 69
PakBus, 1.9.2 Modbus, 1.9.3 DNP3 Communication
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Section 5. System Overview The CR1000 communicates with external devices to receive programs, send data, or act in concert with a network. The primary communication protocol is PakBus. Modbus and DNP3 communication protocols are also supported. Refer to the appendix Telecommunications Hardware for information on available communications devices. 5.1.9.1 PakBus Read More! See PakBus Overview (p. 351). The CR1000 communicates with Campbell Scientific support software, telecommunication peripherals, and other dataloggers via PakBus, a proprietary network communications protocol. PakBus is a protocol similar in concept to IP (Internet protocol). By using signatured data packets, PakBus increases the number of communications and networking options available to the CR1000. Communication can occur via RS-232, CS I/O, or digital I/O ports. Advantages of PakBus: • Simultaneous communication between the CR1000 and other devices. • Peer-to-peer communication - no PC required. • 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 logger. PakBus supports automatic route detection and selection. • Short distance networks with no extra hardware --a CR1000 can talk to another CR1000 over distances up to 30 feet by connecting transmit, receive and ground wires between the dataloggers. PC communications with a PakBus datalogger via the CS I/O port, over phone modem or radio, can be routed to other PakBus dataloggers. • Datalogger to datalogger communications - special CRBasic instructions simplify transferring data between dataloggers for distributed decision making or control. • In a PakBus network, each datalogger is set to a unique address before being installed. The default PakBus address in most devices is 1. To communicate with the CR1000, the datalogger support software (p. 77) must know the CR1000 PakBus address. The PakBus address is changed using the external keyboard / display (p. 399), DevConfig utility (p. 92), CR1000 Status table (p. 528), or PakBus Graph (p. 461) software. 5.1.9.2 Modbus Read More! See Modbus (p. 367). The CR1000 supports Modbus master and Modbus slave communication for inclusion in Modbus SCADA networks. 5.1.9.3 DNP3 Communication Read More! See DNP3 (p. 364). 69