Depending on the Modbus, you can sniff the packets with Wireshark if is Modbus TCP, or with SerialPortMonitor if is Modbus RTU (check the download links in the article). Then you can check the unit’s reply and understand what’s happening. The modbus protocol is quite simple and you will be able to decode it in not much time. Modbus Utility. Modbus Utility is a free software provided by ICP DAS for configuring Modbus TCP based equipment including the ET-7000, PET-7000, tET Series, and tPET Series.
About This File
This software is definitely a prepared to use Modbus RTU get better at for CP1L, CP1L, CJ1, CJ2, ánd CS1.
Thé user produces 'furniture' of items to learn and create. The ladder code automatically performs the marketing communications as set up by the consumer.
Thé CJ1 / CJ2 / CS1 alternative requires the make use of of a Protocol Macro on án SCU31 / SCU41 component, and the CP1T / CP1L function uses the Serial Gateway function of the CP1L / CP1M on á CP1W-ClF11 or CIF12.
Small sample NS screens are supplied with an Omron 3G3JA inverter as an instance Modbus RTU slave.
Updated 1/7/2011 to include 3G3MBack button2 display screen for NS, and to consist of CJ1W-SCU22,32,42 in documentation.
Up to date 9/19/2012 to help 2 ports on an SCU credit card (CS, CJ1, CJ2) or 2 slots on a CP1D / CP1H.