INFICON VGC401 Single-Channel Controller - Manual (Page 56)

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tinb01e1-f (2011-07) VGC401.om
The following abbreviations and symbols are used:
Symbol Meaning
HOST
Computer or terminal
[...] Optional elements
ASCII American Standard Code for Information
Interchange
Dec Hex
<ETX> END OF TEXT (CTRL C)
Reset the interface
3 03
<CR> CARRIAGE RETURN
Go to beginning of the line
13 0D
<LF> LINE FEED
Advance by one line
10 0A
<ENQ> ENQUIRY
Request for data transmission
5 05
<ACK> ACKNOWLEDGE
Positive report signal
6 06
<NAK> NEGATIVE ACKNOWLEDGE
Negative report signal
21 15
"Transmit": Data transfer from HOST to VGC401
"Receive": Data transfer from VGC401 to HOST
For pressure values, the following format is used:
sx.xxxxEsxx
│ │ │└─── Exponent
│ │ └──── Sign exponent
│ └───────-── Mantissa
└────-────-── Sign mantissa
After each ASCII string, the HOST must wait for a report
signal (<ACK><CR><LF> or <NAK> <CR><LF>).
The input buffer of the HOST must have a capacity of at
least 25 bytes.
Definitions
Format of
pressure values
Flow Control