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EX II 3000SP Controller Communications 19
3M Touch Systems Proprietary Information
Commands to the controller are sent on the signal Receive Data (RXD) line
as a serial data stream. For each command it receives, the controller sends a
response to the host on the signal Transmit Data (TXD) line also as a
serial data stream.
Sending Commands to the Controller
When you send a command to the controller, you must use the correct
command format. The general format of a command is as follows:
<Header>Command<Terminator>
Note: The following descriptions of header, command, and terminator, use 3M
Touch Systems terminal emulator key sequences. You may need to enter the
sequence in a different format, depending on your emulator.
The header is the first character in the command string and is the ASCII
start-of-header control character SOH. The hexadecimal code for the ASCII
SOH control character is 01. To start the command sequence, use the key
combination Ctrl A (^A). If you are working with an IBM PC compatible
system, the Ctrl A key combination immediately returns an ASCII ☺
character.
The command, which always follows the header, consists of ASCII
uppercase letters and numbers only (printable characters).
The terminator is the last character of each command string and is an ASCII
carriage return CR. An ASCII CR control character is 0D hexadecimal. To
enter a carriage return, ending the command sequence, use Enter or the key
combination Ctrl M (^M).
This chapter lists each command as a string of ASCII control characters and
printable characters consisting of a header, the command, and a terminator
as follows:
<SOH>Command<CR>
Receiving Responses from the Controller
After executing a command, the controller returns a response or
acknowledgment to the host system. Each controller response consists of a
header, the command response, and a terminator in the following format:
<Header>Command Response<Terminator>