Varian 969-8988 Bedienungshandbuch Seite 86

The addressed SLAVE will respond with an ANSWER
whose structure depends from the MESSAGE type.
When the MESSAGE is a reading command, the SLAVE
will respond transmitting a string with the same
structure of the MESSAGE.
The controller can answers with the following response types:
Response Type Response Length
Logic
Numeric
Alphanumeric
ACK
NACK
Unknown Window
Data Type Error
Out of Range
Win Disabled
Response Value
1 byte
6 bytes
10 bytes
1 byte (0x6)
1 byte (0x15)
1 byte (0x32)
1 byte (0x33)
1 byte (0x34)
1 byte (0x35)
Using the RS 485 interface, the message structure
remains identical to the one used for the RS 232
interface, the only difference being that the value
assigned to the ADDRESS <ADDR>
- after a read instruction of a logic window
- after a read instruction of a numeric window
- after a read instruction of an alphanumeric
window
the command execution has been successfully
completed
the command execution has been failed
the specified window in the command is not a
valid window
the data type specified in the command (Logic,
Numeric or Alphanumeric) is not accorded with
the specified Window
the value expressed during a write command is
out of the range value of the specified window
the specified window is Read Only or temporarily
disabled (for example you can't write the Soft Start when
the Pump is running)
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TECHNICAL INFORMATION
NOTE
Description
87-900-986-01 (C)