INFICON XTM/2 Thin Film Deposition Monitor - Manual (Page 70)

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XTM/2 Operating Manual
3.8.2 Basic Command Structure
The following commands are available via the computer communications:
E . . . . . . Echo. Returns the sent message.
H . . . . . . Hello. Returns the model and software version number.
Q . . . . . . Query. Interrogates the programmable parameters and returns the
value of parameter requested.
U . . . . . . Update. Replaces the particular parameter with the value sent.
S . . . . . . Status. Sends back pertinent information based on the specific
request made.
R . . . . . . Remote. Perform an action based on the specific command given.
Many of these mimic front panel keystrokes.
The send and receive protocol formats are described below and use the
following abbreviations:
STX . . . . Start of transmission character
00,NN . . The size of the command is 2 bytes long with 00 representing the
high order Byte and NN representing the low order byte.
ACK . . . . Command acknowledged character
NAK . . . . Command not acknowledged character
LF . . . . . Line Feed (EOT byte for IEEE)
CS . . . . . Checksum
CR . . . . . Carriage Return
CHECKSUM FORMAT (Message Protocol)
To XTM/2: STX 00 NN message_string CS
From XTM/2: STX 00 NN ACK message_string CS (if success)
- or -
STX 00 NN NAK error_code CS (if failure)
NONCHECKSUM FORMAT (Message Protocol) (RS232)
To XTM/2: message_string ACK
From XTM/2: message_string ACK (if success)
- or -
error_code NAK (if failure)