Campbell Scientific CR3000 CR3000 Micrologger - Page 457

Section 11. Glossary FP2 Two‐byte floating‐point data type. Default CR3000 data type for stored data. While IEEE four‐byte floating point is used for variables and internal calculations, FP2 is adequate for most stored data. FP2 provides three or four significant digits of resolution, and requires half the memory as IEEE4. FTP File Transfer Protocol. A TCP/IP application protocol. full duplex Systems allow communications simultaneously in both directions. garbage The refuse of the data communication world. When data are sent or received incorrectly (there are numerous reasons why this happens), a string of invalid, meaningless characters (garbage) often results. Two common causes are: 1) a baud‐rate mismatch and 2) synchronous data being sent to an asynchronous device and vice versa. global variable A variable available for use throughout a CRBasic program. The term is usually used in connection with subroutines, differentiating global variables (those declared using Public or Dim) from local variables, which are declared in the Sub() and Function() instructions. ground Being or related to an electrical potential of 0 Volts. half duplex Systems allow bi‐directional communications, but not simultaneously. handshake, handshaking The exchange of predetermined information between two devices to assure each that it is connected to the other. When not used as a clock line, the CLK/HS (pin 7) line in the datalogger CS I/O port is primarily used to detect the presence or absence of peripherals. Hello Exchange The process of verifying a node as a neighbor. 457