USTER HVI 900 - Generic Instrument Transmission; Transmission Architecture

USTER® HVI 900 Instruction Manual
Uster Technologies, Inc. Chapter 14
Version 4.0 (1.99) Appendix - Page 14-21
12 Generic Instrument
Transmission
12.4 Transmission Architecture
This document describes the transmission format of the HVI. The
instrument will transmit records of data from the serial port and can be
configured to transmit particular records. The configuration must occur
prior to the sample testing. All records will be transmitted after all
observations of a sample are finished. Transmission records are
characterized by the following:
• All records start with a standard header (discussed in Universal
Record Format), followed by record specific data fields.
• The record length is variable.
• The data is transmitted as ASCII characters. In other words, the
number 12.5 will be transmitted as four characters, namely "1"
(0x31), "2" (0x32), “.” (0x2e), and "5" (0x35).
• Records will be delimited by CR (0x0d).
•
Fields will be delimited by "@" (0x40).
• A checksum is included with all records as the last field.
The checksum for a string is produced by taking the "exclusive-or" of all
the characters in the string up to and including the field delimiter before
the last field where the checksum is to be placed in the record. The
checksum will not include the CR delimiting the records. The checksum
value is formatted as a decimal value.
As an example, consider the following HVI micronaire mean record:
HVI@MIC@02@100@12:00@01-DEC-93@TEST RUN@1@3.5@ @53@<CR>