communication

1. And RS 485 communication

The communication mode of the flowmeter is RS 485, and there are two protocol modes: (the factory default is B mode)

A. Factory calibration communication protocol, as a stand-alone communication protocol;

B. Modbus Agreement, for the multi-machine communication protocol.

The settings are as, respectively:

Paud 9600 (A) / 9600 (B);

Data bit 8;

Stop bit 1;

Check bit / flow control has no.

Communication protocol see: CAFS 5000 series gas mass flowmeter upper computer Modbus communication protocol

2.4-20 mA, the current signal output

       4~20mA Signal output + (LOOP +, brown)

Connect of circuit resistance (this step is the user requiring 4~20mA current signal output

Relationship between external 4~20mA current output circuit voltage and maximum resistance of circuit:

RL(max) = 200Ω

4~20mA ground (LOOP-, black)