Operation
GA 09.033/6.02 – (2011-07) –
©
Oerlikon Leybold Vacuum
63
5.1.2 Communication Protocol
Transmission format
Messages are transmitted to the CENTER ONE as
ASCII strings in the form of mnemonics and parameters.
All mnemonics comprise three ASCII characters.
Spaces are ignored. <ETX> (CTRL C) clears the input
buffer in the CENTER ONE.
The input is terminated by <CR> or <LF> or <CR><LF>
("end of message"), and evaluation in the CENTER ONE
is subsequently started.
The tables starting on
65 are applicable to the
mnemonics and parameters. The maximum number of
digits, the data formats and admissible value ranges are
also specified there.
Transmission protocol
HOST CENTER
ONE Explanation
Mnemonics
[and parameters] ––-–––>
<CR>[<LF>] –––––––-––>
Receives message with
"end of message"
<–-––– <ACK><CR><LF> Positive acknowledgment
of a received message
Reception format
When requested with a mnemonic instruction, the
CENTER ONE transmits the measurement data or pa-
rameters as ASCII strings to the HOST.
<ENQ> must be transmitted to request the transmission
of an ASCII string. Additional strings, according to the
last selected mnemonic, are read out by repetitive
transmission of <ENQ>.
If <ENQ> is received without a valid request, the
ERROR word is transmitted.
