Serial Port Monitor - Software Serial Port sniffer, logger & protocol analyzer for Windows
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MODBUS Send window provides an easy way to control a MODBUS-compatible device. It can come of great help when you need to debug your device, for example verify its responses. You can set all parameters for any standard or user-defined MODBUS function visually and then just click on the Send button. Result rollout will dynamically reflect the changes you make.

MODBUS Send window allows you to send both requests and responses.

It is convenient to use a MODBUS View visualizer in conjunction with a MODBUS Send window for two-way debugging (to view both requests and responses).