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Operation
64
GA 09.033/6.02 – (2011-07) –
©
Oerlikon Leybold Vacuum
Reception 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
<ENQ> -–––––––––––––> Requests to transmit
<––––––--– Measurement
values or
parameters
<–––––––––– <CR><LF>
Transmits data with
"end of message
:
:
<ENQ>.–––––––––––––> Requests to transmit
<––––––--– Measurement
values or
parameters
<–––––––––– <CR><LF>
Transmits data with
"end of message"
Error processing
All strings received are verified in the CENTER ONE. If
an error is detected, a negative acknowledgment <NAK>
is output. The appropriate flag is set in the ERROR
word. Errors can be decoded when the ERROR word is
read.
Error recognition protocol
HOST CENTER
ONE Explanation
Mnemonics
[and parameters] ––––-–>
<CR>[<LF>] -–––––––––>
Receives message with
"end of message"
***** Transmission or programming error *****
<–––– <NAK><CR><LF> Negative acknowledgment
of a received message
Mnemonics
[and parameters] –––––->
<CR>[<LF>] –––––-––––>
Receives message with
"end of message"
<––––- <ACK><CR><LF> Positive acknowledgment
of a received message