API CommandsAppendix A

 

 

 

? - Query

 

 

 

 

 

 

TYPE

System

 

 

 

EXECUTION

Immediate

 

 

 

SYNTAX

?

Query the present configuration or mode of the command preceding the ?

 

DESCRIPTION

 

 

 

Most commands have a corresponding Query (?) command formed by appending a question mark (?) to the command letter. Query commands place their responses into the output queue until the controller retrieves them. They respond with the present configuration or mode of a previously executed command. When appropriate, the response from a Query command is in the form of a command string which, if it were executed, would put the unit into the configuration it was in when the Query was executed.

For instance, the response of the User Terminator Query (V?X) command is in the following form: Vval where 0 < val < 255. This response is in the form of the Set User Terminator (V) command and, if it is sent to the unit, it would set the User Terminator to the same value that it had when the Query was issued. Query responses are always fixed-length strings in a pre-defined format.

Any number of Query commands can be combined into one string to create a specialized status command that responds with only the information of interest for a given application.

Query commands are immediate. Their responses are generated as soon as they are interpreted, before any other commands, including the Execute (X) command.

Note: Even though Query commands generate their responses as soon as they are interpreted, they must still be followed by an Execute (X) command for proper termination. For more information on command execution, refer to the X command reference presented later in this appendix.

EXAMPLE

PRINT#1,

“OUTPUT07; V1 X V? X”

‘ Get the response of current User Terminator

PRINT#1, “ENTER07”

‘ Retrieve response

INPUT A$

 

‘ Screen shows V1

PRINT A$

 

 

PRINT#1, “OUTPUT07; V0 X V? X”

‘ Change User Terminator and get response

PRINT#1, “ENTER07”

‘ Retrieve response

INPUT A$

 

‘ Screen shows V0

PRINT#1, “OUTPUT07; V4 V? X”

‘ Change User Terminator and get response - No

PRINT#1, “ENTER07”

intermediate X command

‘ Retrieve response

INPUT A$

 

‘ Screen shows V0 User Terminator. Response is still V0

 

 

because the immediate command V? was executed

PRINT A$

 

before the deferred command V4

 

 

PRINT#1, “OUTPUT07; V? X”

‘ Get User Terminator response

PRINT#1, “ENTER07”

‘ Retrieve response

INPUT A$

 

‘ Screen shows new User Terminator V4

A-46

ChartScan User’s Manual

Page 171 Page 173
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Omega Vehicle Security 1400 manual ? Query, OUTPUT07 V1 X V?, PRINT#1, OUTPUT07 V0 X V?, PRINT#1, OUTPUT07 V4 V?
Page 171 Page 173

1400 specifications

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