Agilent Technologies 8698961R002, User Manual

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17 Technical Information
RS 232/RS 485 Communication Description
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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.
NOTE
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>.
The controller can answers with the following response types:
The controller can reply with the following types of response:
Table 6
Type Length Value Description
Logic - After a read instruction of a logic window.
Numeric 6 bytes - After a read instruction of a numeric
window.
Alphanumeric 10 bytes - After a read instruction of a alphanumeric
window.
ACK 1 byte (0x6) Execution of the command has been
successful.
NACK 1 byte (0x15) Execution of the command has failed.
Unknown
Window
1 byte (0x32) The window specified in the command is not
a valid window.
Data Type Error 1 byte (0x33) The data type specified in the command
(Logic, Numeric or Alphanumeric) is not in
agreement with the Window specified.
Out of Range The value expressed during a write
command is not within the range value for
the specified window.