INFICON XTC/3 Thin Film Deposition Controller Operating Manual - Manual (Page 141)

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XTC/3 Operating Manual
5.2.2.5 Standard STATUS Commands
Command:
S () - see special case S0 below.
Command ID = See “S Command ID” column in Table 5-4 .
Action Value = , only required for S0.
S0 command: The S0 command requires a timer tick to be sent. Timer ticks
increment internally from 0 to 256 (0x00 to 0xFF) at a rate of 4x per second.
XTC/3 stores the S0 data set valid for each timer tick and returns that specific data
set when the S0 command is sent with that particular timer tick. If the timer tick sent
is not the current one, the data returned will be old data and may be as old as 64
seconds (256 timer ticks / 4 per second). Therefore, to get current data, the timer
tick must first be extracted from a prior command and then incremented every 250
msec and inserted in the S0 as the .
Response:
(…
Integer = 4 byte, low to high
Float = 4 byte, ANSII standard, single precision, low to high