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6-64 Chapter 6: Programming
Model 801GC, 801GF & 801GX¥Rev. A
Command headers which require numeric data should
be followed by at least one separator character
(whitespace) then the data. Numeric data sent with
a command is in decimal format. Numeric data can
be represented in one of three methods; integer, float-
ing point, and scaled floating point. The three meth-
ods shown below would all represent the number
42.
Integer 42
Floating Point 42.00
Scaled Floating Point 4.200E+01
Queries
Queries are comprised of a header followed imme-
diately by a question mark (?). If there are any char-
acters between the query header and the question
mark character (including whitespace), a command
error will result. Queries, upon completion of ex-
ecution return a response message. A response
message is comprised of the requested data termi-
nated with an NL (ASCII 10) character. For example
the following text would be returned in response to
the HRAT? (horizontal rate query) message:
3.1500E+04<NL>
Note that the HRAT? query returns its parameter in
exponential form. Possible returned parameter forms
are integer, exponential, and string. The response
form of each queryable message is shown at the end
of this section.
Integer form: 3965
Exponential form: +3.965E+03
String form: "A string"
Output Queue
When a query is executed, the resulting response
message is placed in an output queue where it can
be read by the controller. The 801G* has an output
queue that is 255 bytes long. When a message is
present in the output buffer, the MAV (message