Elo TouchSystems 1525L manual Commands, Data Format, Responses, Field, Offset, Size, Comment, data

SECTION 3. COMMANDS

This section describes all of the commands that can be used with the MagTek Windows Device Drivers. Some commands require parameters to indicate to the driver exactly what function is to be performed. While there are a few device-specific commands, most commands can be used with any device.

DATA FORMAT

All commands sent to the driver and all responses received are strings of printable ASCII characters delimited by <LF>. The driver will also accept <CR> as a delimiter. All command and response strings begin with the character /. If a command has arguments, they should be separated with one or more white spaces. The driver accepts space <SP> and <TAB> as white space characters.

Note

A command delimiter sent immediately after the previous command delimiter is interpreted as an empty command and is ignored by the driver.

RESPONSES

All responses to the transaction commands are formatted with fixed fields, to allow them to be parsed either by scanning for white spaces or by using constant offsets into the response string. In the descriptions of the commands found later in this section, the arguments sent with the responses are shown in their respective locations but may not indicate the exact number of spaces. The actual responses are sent in a fixed-field format, as shown in the following table:

Field	Offset	Size	Comment
command name	0	12	This field identifies the command that produced this
	(0-11)		response, e.g., /get is followed by 8 spaces to fill
			the 12 locations.
arg1	12	12	Fixed-size argument – value depends on the
	(12-23)		command sent. A property name is left justified in
			the field and begins in location 12. Status
			information is right justified in the field (with a
			trailing space) so the SS value will always be located
			at positions 21 and 22.
arg2	24	var	Variable size argument – used for responses with
	(24-??)		variable-size data, like /get prop or read status
			data.

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