Rs 232/Rs 485 Communication Description; Communication Format; Communication Protocol - Agilent Technologies TV 401/301 NSF Mode D'emploi

17 16BTechnical Information
149BRS 232/RS 485 Communication Description

RS 232/RS 485 Communication Description

Both the RS 232 and the RS 485 interfaces are available on the
connector J6.
The communication protocol is the same (see the structure below),
but only the RS 485 manages the address field. Therefore to enable
the RS 485 is necessary to select the type of communication as well
as the device address by means of the Navigator software.

Communication Format

Communication Protocol

The communication protocol is a MASTER/SLAVE type where:
The communication is performed in the following way:
1.
2.
The MESSAGE is a string with the following format:
<STX>+<ADDR>+<WIN>+<COM>+<DATA>+<ETX>+<CRC>
where:
262/290
8 data bit
no parity
1 stop bit
baud rate: 600/1200/2400/4800/9600 programmable
Host = MASTER
Controller = SLAVE
the host (MASTER) send a MESSAGE + CRC to the controller
(SLAVE);
the controller answer with an ANSWER + CRC to the host.
TV 401/301 NSF User Manual / 87-900-963-01 (E)