Agilent Technologies TwisTorr 305 FS User Manual page 177

Each nibble in the bytes following the interface status byte represents the
status of the last attempt to write a parameter with following coding (diag
status byte):
0
1
2
3
4
5
6
F
The ProfiBus external diagnosis services are used to report following
unexpected situations:
Controller fail: if the controller goes in fail mode, an external
▪
User parameter mismatch: if the user sets one or more parameters
▪
TwisTorr 305 FS Remote Controller User Manual / 87-901-059-01
Write success
Controller response was "NACK"
Controller response was "Unknown window"
Controller response was "Bad Data Type"
Controller response was "Over range"
Controller response was "Bad operation"
Controller response was an unknown response
Parameter not supported by the controller
diagnostic service is required and one byte in the diagnostic buffer
signals the type of failure.
out of their allowed range, a ProfiBus external diagnostic service is
required and some bits in the diagnosis frame signals which
parameter is wrong (i.e. over range or under range).
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