Agilent Technologies TPS-mini 9699181, User Manual

Page: 55 / 70

17 Technical Information
Window Protocol
302/318 TPS-mini User Manual / 87-901-003-01 (E)
Tab. 6
Data Type Field Length Valid Characters
Logic (L) 1
‘0’ = OFF
‘1’ = ON
Numeric (N) 6 ‘-‘, ‘.’, ‘0’ . . . ‘9’ right justified with ‘0’
Alphanumeric (A) 10 from blank to ‘_’ (ASCII)
ƒ
<ETX>
(End of transmission) = 0x03
ƒ
<CRC>
= XOR of all characters subsequent to
<STX>
and
including the
<ETX>
terminator. The value is hexadecimal coded
and indicated by two ASCII character.
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>.