Campbell Scientific CR6 CR6 Measurement and Control System - Page 561
Peer-to-Peer PakBus® Communications
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Appendix A. CRBasic Programming Instructions A.13 Syntax SerialOutBlock(ComPort, Expression, NumberBytes) Peer-to-Peer PakBus® Communications Read More See section PakBus Overview (p. 395) for more information. Also see Campbell Scientific PakBus Networking Guide available at www.campbellsci.com. PakBus is a proprietary networking communication protocol designed to optimize communications between Campbell Scientific dataloggers and peripherals. PakBus features auto-discovery and self-healing. Following is a list of CRBasic instructions that control PakBus processes. Some PakBus instruction specify a PakBus address (PakBusAddr) or a COM port (ComPort): PakBus address is a CRBasic variable; COM port sets a default communication port. The following COM port arguments are available: • ComRS232 • ComME • Com310 • ComSDC7 • ComSDC8 • ComSDC10 • ComSDC11 • ComU1 • ComU3 • ComU5 • ComU7 • ComU9 • ComU11 • ComC1 • ComC3 • Com32 - Com46 (available when using a one-channel I/O expansion module. See the appendix Serial I/O Modules List (p. 596) ) Baud rate on asynchronous ports (ComRS232, ComME, ComU1, ComU3, ComU5, ComU7, ComU9, ComU11, ComC1, ComC3, and Com32 to Com46) default to 9600 unless set otherwise in the SerialOpen() instruction, or if the port is opened by an incoming PakBus® packet at some other baud rate. Table Asynchronous Port Baud Rates (p. 565) lists available baud rates. In general, PakBus instructions write a result code to a variable indicating success or failure. Success sets the result code to 0. Otherwise, the result code increments. If communication succeeds, but an error is detected, a negative result code is set. See CRBasic Editor Help for an explanation of error codes. For instructions returning a result code, retries can be coded with CRBasic logic as shown in the following code snip: For I = 1 to 3 GetVariables(ResultCode,....) If ResultCode = 0 Exit For Next 561
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