Agilent Technologies MS40+ - Window Protocol Description

Technical Information
RS 232/RS 485 Communication Description
5
MS40+ Single Stage Rotary Vane Pumps User Manual / 87-901-008-01 (H.00) 88/104
Window Protocol Description
Communication Format
The communication protocol is a MASTER/SLAVE type where:
 8 data bit
 no parity
 1 stop bit
 baud rate: 600/1200/2400/4800/9600/19200/38400
p
rogrammable
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 MESSAGE + CRC to the controller
(SLAVE);
2. The controller answer with an ANSWER + 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. The field length is variable according to the data
type as per the following table: