Sage Gas Meters
Sage Paramount Industrial Mass Flow Meter - "SagePara" Configuration
Included in WNC firmware version 36.20 and newer.
As a Modbus RTU device, the WNC must be pre-configured to connect to this third-party device. Please contact Packet Power Support to discuss configuration options.
Sage Paramount Industrial Mass Flow Meter (for gas and other fluids)
Possibly other Sage meter models with Modbus RTU support
Modbus RTU Register Number
Total accumulated gas volume (liters)
Gas Flow Rate
Current gas flow rate (liters/hour)
Required Meter configuration
The device must have its Modbus RTU settings correctly set before connecting the WNC. The desired Modbus RTU settings are baud rate: 19200, data bits: 8, parity: even, device address: 0x31 (49). These are the factory default settings, so it is unlikely that you will need to change these settings unless you have previously reconfigured the meters to work with a different system. These settings are shown on the meter display to provide confirmation. If these settings need to be changed, you must use the Sage software with the meter's USB connection. Please follow the instructions in the Sage gas meter manual and website to update the meter settings.
If your meters are already configured for alternative device address or baud rate, please contact Packet Power support to discuss factory-configuration options.
The WNC support for Modbus RTU is capable of half- or full-duplex operation. That is, it provides separate connections to the WNC RS-485 transmitter and receiver signal pairs. For a half-duplex RS-485 bus, these pairs are connected together and connected to two-conductor twisted-pair wiring. For a full-duplex RS-485 bus, these pairs are kept separate and connected to four-conductor twisted-pair wiring. Typically, half-duplex is used for industrial control systems like these. The WNC hardware contains the necessary terminating resistors, as well as a ground connection for any cable shielding, if used. Please contact Packet Power support in case of questions regarding proper wiring of the Modbus RTU RS-485 bus.
Connect the Modbus RTU twisted-pair cable to the gas meter using the green screw terminals on the back. On this meter, the terminals are labeled with B+ and A-. Please refer to the power meter user guide for details on wiring for serial communications.
On the rear of the WNC, use the green 5-pin plug to connect the Modbus RTU twisted-pair cable. Connect pins 1 and 4 together to the "B+" wire in the cable. Connect pins 2 and 3 together to the "A-" wire in the cable. If the cable has a shield, connect it to ground at ONLY ONE point in the modbus network. Since the WNC will act as a Modbus RTU controller, pin 5 can be used to ground the cable shield.
If the serial communications are inoperable, try reversing the wire connections at the WNC (connect the "B+ wire to pins 2-3 and connect the "A-" wire to pins 1-4). If communications are working correctly, you should observe gas flow data on the EG4 node page, as well as periodic flashing of the COMM LED on the front face of the Sage Paramount gas meter.
Links and documentation
Sage Paramount Industrial Mass Flow Meter
Sage Paramount User Manual