Agilent Technologies TPS-mobile 9698403, User Manual

Page: 377 / 400

Technical Information
Letter Protocol Description
17
TPS-mobile User Manual / 87-901-005-01 (F) 377/400
Communication Protocol
The communication protocol is a MASTER/SLAVE type where:
▪
Host = MASTER
▪ Controller = SLAVE
The communication is performed in the following way:
1.
the host (MASTER) send a M CRC to the controller
(SLAVE);
2.
the controller answer with an CRC to the host.
The MESSAGE is a string with the following format:
<STX>+<ADDR>+<WIN>+<COM>+<DATA>+<ETX>+<CRC>
Where:
NOTE
When a data is indicated between two quotes (‘...’) it means that the indicated
data is the corresponding ASCII character.
▪ <STX> (Start of transmission) = 0x02
▪
<ADDR> (Unit address) = 0x80 (for RS 232)
▪ <ADDR> (Unit address) = 0x80 + device number (0 to 31)
(for RS 485)
▪ <WIN> (Window) = a string of 3 numeric character indicating the
window number (from ‘000’ to ‘999’); for the meaning of each
window see the relevant paragraph.
▪ <COM> (Command) = 0x30 to read the window, 0x31 to write into
the window
▪
<DATA> = an alphanumeric ASCII string with the data to be
written into the window. In case of a reading command this field
is not present.