Rs 232/Rs 485 Communication Description; Communication Format; Communication Protocol - Agilent Technologies TV 801 Bedienungshandbuch

17 Technical Information

RS 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 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:
the host (MASTER) send a MESSAGE + CRC to the controller
(SLAVE);
<STX>+<ADDR>+<WIN>+<COM>+<DATA>+<ETX>+<CRC>
where:
When a data is indicated between two quotes ('...') it means that the indicated
NOTE
data is the corresponding ASCII character.
230/248
8 data bit
no parity
1 stop bit
baud rate: 600/1200/2400/4800/9600 programmable
Host = MASTER
Controller = SLAVE
1. the controller answer with an ANSWER + CRC to the host.
2. the MESSAGE is a string with the following format:
TV 801 Navigator Bolted Flange User Manual / 87-900-980-01 (D)