文件列表:

LICENSE
Makefile
make-libmodbus
mbrdr.c
mbrdr.cfg
mbrdr.service

mbrdr -- Modbus Reader Reads data from a Huawei SUN2000 Solar Inverter and publishes the data using MQTT. These are braindead! The on-line fora are full of suggestions on how to read out data with confidence but no real good infomration seems to be available. The Huawei responces indicate they do not have any ida why reading data using modbus sometimes works, sometimes not. After experimening, I managed to cook up an algorithm that seems to work (so far). In pseudo code it looks like: 1 Establish a TCP connection. 2 Sleep 5 s. 3 For each parameter to read 4 read a parameter 5 send a modbus package 6 read the responce with a timeout of 5 s. 7 sleep 2 s before reading the the next parameter I.E. the modbus slave (renamed server some time ago) cannot cope with incoming requests too quickly. 1: It needs a delay of several seconds after a TCP connection is established bef ore the first request is received, too quick and it does not respond at all, 5 s seems to have a very log failure rate. 2: The slave also needs a very long time before it responds, using a 5 s time-out gives a very low failure rate. 3: Requests must be separated by a long duration. 2 s gives a very low failure rate. Note that ANY fault in the timing or using the wrong modbus id results in no responce at all (time-out). To provide an inverter in the 1500-2000 USD range with this kind timing issues is really weird. I used libmodbus for the modbus communication. It works great but as I prefer static linking for this I added a few scripts to build and create a static library to link with. A description of the modbus registers for my inverter (SUN2000-10KTL-M0) can be found in: https://www.photovoltaikforum.com/core/attachment/180219-solar-inverter-modbus-interface-definitions-v3-0-pdf/

近期下载者：

相关文件：

评论：[我要评论] [举报此文件]

收藏者：