Agilent Technologies TV70 Navigator 969-8970, User Manual

Page: 167 / 182

Technical Information
RS 232/RS 485 Communication Description
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Controller TV70 Navigator User Manual / 87-900-956-01 (G) 167/182
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:
Response Type Response Length Response Value Description
Logic 1 byte - 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 an alphanumeric
window
ACK 1 byte (0x6)
the command execution has been
successfully completed
NACK 1 byte (0x15) the command execution has been failed
Unknown Window 1 byte (0x32)
the specified window 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
accorded with the specified Window
Out of Range 1 byte
(0x34)
the value expressed during a write command
is out of the range value of the specified
window
Win Disabled 1 byte (0x35)
the specified window is Read Only or
temporarily disabled (for example you can’t
write the Soft Start when the Pump is
running)