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EX II 3000SP Controller Reference Guide
3M Touch Systems Proprietary Information
Note: The following descriptions of header, response, and terminator, use 3M
Touch Systems terminal emulator key sequences. The format of controller responses
varies depending on the terminal emulation mode you are using.
The header is the first character in the response string and is the ASCII
start-of-header control character SOH. The hexadecimal code for the ASCII
SOH control character is 01. If you are working with an IBM PC compatible
system in terminal mode, the SOH control character returns a ☺ character to
the screen.
The response, which always follows the header, is a range of ASCII
characters depending on the type of command sent. Responses can be in
many forms.
For example, one standard response is 0 (ASCII character ‘zero’ or 30
hexadecimal). This response indicates a successful command completion
for most commands, while it indicates a failed completion for other
commands. See the firmware reference section for a description of what the
response indicates for each particular command.
Another standard response is 1 (ASCII character ‘one’ or 31 hexadecimal).
In most cases, this response indicates the command failed. The controller
received an invalid command that it could not execute.
Some possible reasons for a command failure include:
• The command was not formatted correctly.
• The system parameters were not set up to allow command execution.
• The controller does not support the command.
The terminator is the last character of each response string and is an ASCII
carriage return CR. The hexadecimal code for the ASCII CR control
character is 0D hexadecimal. The value returned in the response will be the
ASCII control character for a carriage return, displayed on the screen as the
cursor moving to the next line.
In this chapter, responses are shown as a string of ASCII characters
consisting of a header, the response, and a terminator as follows:
<SOH>Response<CR>