INFICON VGC401 Single-Channel Controller - Manual (Page 58)

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tinb01e1-f (2011-07) VGC401.om
HOST VGC401 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"
All strings received are verified in the VGC401. 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.
HOST VGC401 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
Reception protocol
Error processing
Error recognition
protocol