Regal RH40, User Manual

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M53: COMM
1. Port Config
2. Protocol
3. Monitor
7. Communication
§7.1 General
The RH40 series ultrasonic flow meter uses a simple USB communication interface for access to a variety
of communication devices. The RH40 includes an extension with a DB-9 connector. This meter uses
ModBus for communication. The user can configure the flow meter to acquire measurements from a PC
by completing the following steps:

Install the USB driver on the PC. This will generate a virtual COM port for the flow meter.

Connect the flow meter to the PC through the USB cable provided with the flow meter unit

Check the flow meter COM port settings (Baud rate, parity, etc.)

Set up PC software, either Hyper Terminal or StufManager
TM
software
§7.2 Connect the Flowmeter to a PC
A standard USB cable and serial cable are provided with your RH40 unit. Plug the serial cable into the
port at the bottom of the meter. Plug the other end of the serial cable into the terminal box. Plug one end
of the USB cable into the computer and the other end into the port on the terminal box. Then, turn on the
flow meter. Your computer should automatically detect the USB connection and sign a virtual COM port
(VCOM).
Note: you need to install the USB driver before connecting the USB cable.
§7.3 Check the Flowmeter COM Port Settings
Go to menu window M53 to check the COM port settings on your flow meter.
baude rate is displayed under 1. Port Config. Write down the baud rate. It is
needed later in order to set up the computer’s COM port. If you want to change