HS452, HS652 Rotary Vane Pumps - Agilent Technologies

Technical Information
RS 232/RS 485 Communication Description
5
Communication Format
• Physical level: both RS232 e RS485
• 8 data bit
• no parity
• 1 stop bit
• baud rate: 600/1200/2400/4800/9600 programmable
Communication Protocol
The communication protocol is a MASTER/SLAVE type where:
• Host = MASTER
• Pump = 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:
++++++
Where:
NOTE
When a data is indicated between two quotes (‘...’) it means that the indicated
data is the corresponding ASCII character.
• (Start of transmission) = 0x02
• (Unit address) = 0x80 (for RS 232)
• (Unit address) = 0x80 + device number (0 to 31)
(for RS 485)
HS452, HS652 Rotary Vane Pumps User Manual / 87-900-978-01 (L) 107/126