Grason-Stadler GSI
®
61 CLINICAL AUDIOMETER
Data Transfer
Record and Field Formatting
Communication with the remote device is performed by sending and receiving information
in “records.” Each type of information has its own record format. Each record is divided
into “fields” which contain specific information. All records are formatted with a
predefined, fixed length format. The generic format for all records is:
Record Prefix Record Type Data Fields Checksum Record Terminator
The record prefix consists of a “:” character and denotes the start of a record. Input
records do not contain a checksum. The record terminator consists of a “CR,” “LF”
sequence. Each record consists of fixed length data fields with any unused or Zero data
fields filled with a “0.” All records consist of a sequence of printable ASCII characters
from the set of “0” to “9,” “A” to “G,” “-,” “:,” .”,” “_,” “CR” and “LF.” All multiple
character ASCII fields will be right justified with unused character positions filled with “_”
characters. Positive numeric values will not contain a “+” sign; this will be implied.
Negative values contain a “-” sign in any character position to the left of the most
significant digit if the number. Unless specified, the decimal point for non-integer numbers
will not be included in the character sequence.
Checksums
Checksums will be calculated so as to maintain compatibility with the GSI 16 as the mod
256 sum of all preceding characters on the record, including the “:” prefix, and stored as
two HEX ASCII characters.
6-6
1761-0100 Rev. B
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