Agilent Technologies MS120

Technical Information
User Interface
5
MS120 Single Stage Rotary Vane Pumps User Manual / 87-900-150-01(B) 186/198
Serial Communication Protocol
Both RS-232 and RS-485 interfaces are available on the J1 I/O
connector.
Communication Format
 8 data bit
 no parity
 1 stop bit
 baud rate: 600/1200/2400/4800/9600/19200/38400
programmable
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)