Siargo MF4000 - RS485 Modbus; RS232 Communication Protocol; Hardware Connection

www.Siargo.com MF / FS4000 User Manual 17 | P a g e
GCF = 1000 x V(new) / V (20°C) = T (o°C) / T (20°C) = 1000 x 273 / 293 = 932
Then the gas conversion factor would be 932.
In some cases, the actual system may have a constant deviation from that at the calibration,
this GCF can also be used to adjust. For additional information, please contact the
manufacturer.
11) Set the accumulated flow rate unit.
When the instant flow rate unit is sccm, the accumulated flow rate unit can be set to scc or
SL;
When the instant flow rate unit is SLPM, the accumulated flow rate unit can be set to SL or
Nm
3
.
5.5 RS485 Modbus / RS232 communication protocol
The digital communication protocol is based on standard Modbus RTU Half-plex mode or the RS232
communication protocol. A master (PC or PLC) can communicate with multiple slaves (the current
product) for data exchange and communication parameter configuration. Refer to Table 3.2 for
cable connection. RS232 only supports single-meter communication, and Flow control is always
NONE.
5.5.1. Hardware connection
The RS485 hardware layer is TIA/EIA-485-A, as illustrated below. In this configuration, the product
(MF/FS4000) is a slave.
Figure 5.3: RS485 hardware