5 Command Channel Primer5.1 Command Channel CommandsAll iVu command channel request command frames use the following syntax:>> command group item valueNotes is the end-of-frame delimiter. See below for a description.All commands are in ASCII and are case-insensitivecommandAn action to be performed on a particular iVu group; for example, get, set, do, login, or logout.groupIdentifies the iVu group that the command should act upon; for example, info, system, trigger, or bcr_input.itemFurther qualifies the action by specifying an item within the identified group; for example, comparedata or status.valueFor set commands, this identifies the data that must be set for the specified group item.Note: Item is not used with get commands.Identifies the end-of-frame for the command so that the iVu knows to begin processing. The iVu will return aresponse that includes the end-of-frame delimiter. The options for the are set in the iVu Serial I/O menu,and are as follows:• • • • • • • NOTE: When data is displayed on iVu screens such as the Port Status screen, printabledelimiters are displayed as expected. Non-printable characters, such as aredisplayed in hex notation (\x0D).5.1.1 Command FlowThe command flow should be such that a new command request should not be issued until the iVu command channelacknowledges the previous command request.For example, the following is a series of command requests and responses. The first request sets the trigger mode tocommand and, once the sensor responds with an "OK," the next command request is issued to do (or execute) the trigger.>> set trigger mode command\x0D\x0A<< OK\x0D\x0A>> do trigger\x0D\x0A<< OK\x0D\x0A5.1.2 String Delimiters and EscapingBy default setting, all strings used in commands are enclosed in quotation marks (""). All text in quotes is part of thecommand. Quotes (") or back-slashes (\) that are part of the string must be escapted with a back-slash. For example:"abc\"def\"ghi\\jkl"Set the String Delimiter parameters to 'None' if strings should not be enclosed in quotation marks.5.1.3 Command Channel Command SynopsisThere are a number of general types of commands to do, set, and get sensor data.iVu Plus BCR Communications18
