Rs 232/Rs 485 Communication Description; Communication Format; Communication Protocol - Agilent Technologies TV 902 Bedienungshandbuch

RS 232/RS 485 Communication Description

Both the RS 232 and the RS 485 interfaces are available on the
connector P2.
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.
(SLAVE);
2.
The MESSAGE is a string with the following format:
<STX>+<ADDR>+<WIN>+<COM>+<DATA>+<ETX>+<CRC>
where:
TV 902 Navigator User Manual / 87-900-999-01
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
the controller answer with an ANSWER + CRC to the host.

RS 232/RS 485 Communication Description

(A)
Technical Information
275/292
18