Communication Troubleshooting the WattNode Modbus

Communication Troubleshooting the WattNode Modbus The WattNode Modbus COM LED Is Flashing Green... This means the WattNode® Modbus® meter is seeing valid packets addressed to it and should be responding. ...But the Modbus Master Is Reporting Timeouts This means the Modbus master (the PC or data collection device) isn't seeing a response from the meter. [...]

LonWorks Network Troubleshooting

LonWorks Network Troubleshooting From time to time, LonWorks® devices like the WattNode® meter stop communicating or exhibit unreliable communication. This can occur for a variety of reason: Electromagnetic interference Loose, intermittent, or broken wiring Defective or damaged WattNode meter Excessive bus length Bus needs termination Too many nodes on the bus Electromagnetic Interference This can [...]

Tools for WattNode Modbus Test and Development

Tools for WattNode Modbus Test and Development Software Tools Windows PortMon utility (by Mark Russinovich): http://technet.microsoft.com/en-us/sysinternals/bb896644.aspx Modbus Software – list of Modbus master programs for Windows Linux http://tldp.org/HOWTO/Serial-HOWTO.html – Detailed serial port information http://tldp.org/HOWTO/Serial-HOWTO-12.html#ss12.1 – Serial Monitoring/Diagnostics Programs http://sourceforge.net/projects/serlook/ – SerLooK Linux serial port monitoring tool Hardware Tools The following hardware items and tools can […]

Hardware for WattNode Code Development

Tools for WattNode Modbus Test and Development Software Tools Windows PortMon utility (by Mark Russinovich): http://technet.microsoft.com/en-us/sysinternals/bb896644.aspx Modbus Software – list of Modbus master programs for Windows Linux http://tldp.org/HOWTO/Serial-HOWTO.html – Detailed serial port information http://tldp.org/HOWTO/Serial-HOWTO-12.html#ss12.1 – Serial Monitoring/Diagnostics Programs http://sourceforge.net/projects/serlook/ – SerLooK Linux serial port monitoring tool Hardware Tools The following hardware items and tools can […]

Troubleshooting WattNode Pulse Meters

Troubleshooting WattNode Pulse Meters This article is a step-by-step troubleshooting guide for WattNode® Pulse meters. It assumes that all the electrical and current transformer (CT) connections to the meter are wired up, that the line voltage is turned on, and the load being measured is drawing current. DANGER — HIGH VOLTAGE HAZARD WARNING These instructions […]

CT Output Voltage Test

CT Output Voltage Test The output voltage of a current transformer (CT) can be tested in the field using an digital multimeter with a millivolt AC (mVac) range. This test is useful to confirm that the CT is working properly and that current is flowing in the conductor that the CT is installed on. If […]

WattNode Voltage Ranges and Power Supply

Operating Voltage Ranges and Power Supply WattNode® electric meters are available in seven different voltage range models. Each model handles different electrical service types and voltages, so you must be sure to choose a WattNode model that matches the service voltages you are measuring. All current WattNode models have either "3D" or "3Y" in the [...]