Table of Contents
Advertisement
10.3
Direct connection to the host device via RS232
10.4
Communication protocols and their use
The flow meter supports these three communication protocols: FUJI protocol, MODBUS-C
protocol, MODBUS-I protocol.
10.4.1
HL protocol
The host device requests the flow meter to respond by sending a command. The baud rate of
asynchronous communication (primary station: computer system; secondary station: ultrasonic
flow meter) is generally 9600 BPS. A single byte has the data format (10 bits): one start bit, one
stop bit and 8 data bits, check bit: none. A data character string is used to express basic
commands and a carriage return (ENTER) is used to express the end of a command. The
characteristic is that the data string is flexible. The order applies to both RS232 and RS485. Some
frequently used commands are listed in the following chart:
© PCE Instruments
37
Advertisement
Table of Contents
