INFICON VGC401 Single-Channel Controller - Manual (Page 57)

tinb01e1-f (2011-07) VGC401.om
57
Messages are transmitted to the VGC401 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 VGC401.
The input is terminated by <CR> or <LF> or <CR><LF>
("end of message"), and evaluation in the VGC401 is
subsequently started.
The tables starting on  59 are applicable to the
mnemonics and parameters. The maximum number of
digits, the data formats and admissible value ranges are
also specified there.
HOST VGC401 Explanation
Mnemonics
[and parameters] ––-–––>
<CR>[<LF>] –––––––-––>
Receives message with
"end of message"
<–-––– <ACK><CR><LF> Positive acknowledgment
of a received message
When requested with a mnemonic instruction, the
VGC401 transmits the measurement data or parameters
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.
5.1.2 Communication
Protocol
Transmission format
Transmission
protocol
Reception format