Communication
Port A Settings Interface
[Modbus RTU]
S
Use Interface to configure how the RS232 communication port is used.
• Modbus RTU
• Remote menu (RDI – Remote Display Interface)
• Primo 3.x
• Flow diagnostic – After every flow measurement, provides data out of the
communication port primarily for diagnosing flow measurement issues.
• Disable port
The remote menu Interface checks for display updates once a second. If a change
is detected, the display contents are transmitted in ASCII format over the RS232
communication port. The remote menu Interface also allows for menu navigation and
control of the meter as if using the external push buttons. Keyboard control characters
such as <UP>,<DWN> and <ENTER> are supported to navigate the menus.
The Primo 3.x Interface emulates the legacy Primo 3.x protocol. This protocol transmits an
ASCII string in the following format every 500 ms:
“RATE;0.0000; GPM; TOT1;150.0000; USG ; TOT2;150.0000; USG ;” – For Unidirectional Mode
“RATE;0.0000; GPM; TOT+;10.0000; USG ; TOT-;50.0000; USG ;” – For Bidirectional Mode
To change the Interface follow these steps from the Port A Settings menu:
1. Select Interface to view the Interface display.
2. Select an interface.
3. Press [E] to save and return to the Port A Settings menu.
Port Address
[1]
S
Use Port Address to establish the Modbus RTU address. Modbus RTU requests are only
processed if the configured port address of the meter matches the request address
found in the Modbus RTU packet. The range of addresses supported by Modbus RTU
is 1…247. Modbus RTU request packets with an address of 0 imply the packet is to be
treated as a broadcast packet.
To change the port address, follow these steps from the Port A Settings menu:
1. Select Port Address to view the Port Address display.
2. Select a port address (1…247).
3. Press [E] to save the option and to return to the Port A Settings menu.
Baud Rate
[9600]
S
The following baud rates are supported
• 9600
• 19200
• 38400
To change the baud rate, follow these steps from the Port A Settings menu:
1. Select Baud Rate to view the Baud Rate display.
2. Select one of the following baud rates: 9600, 19200 or 38400.
3. Press [E] to save the option and to return to the Port A Settings menu.
Using the Main Menu Programming Options
Page 46 March 2022MAG-UM-01272-EN-21
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