Hi everyone,

I've been experimenting ProviewR communication with Arduino as Modbus slave. I've tested a bunch of different Modbus libraries and only the "mudbus" Modbus TCP library works fine so far...
So, could anyone suggest me which free Modbus Simulator is the best to emulate a ProviewR Modbus Master over RTU and TCP? And by the way, I also want to ask how is Modbus Addressing (Master, Slave, Module) handled in ProviewR.

/Maverick

I use modpoll and diagslave for testing Modbus TCP and RTU communications. Both are free, command line, open source tools. Modpoll is a client that is used to read and write registers. Diagslave is a test Modbus server. Binaries are available for all flavors of linux x86, x86_64, ARM_32, ARM_64 and Windows O/S. Source code is available for everyone else. These are excellent test tools to help get you up and running, quickly.

Also, xxd is a linux program used to convert files to readable hex, so you can interpret raw RTU communications. socat is a tunneler program that enables sharing of serial and TCP ports from remote machines. For hard core communication debugging, wireshark has both Modbus RTU and TCP protocol plug-ins.

Proview handles Modbus in a standard way, where address 0 = R40001 modbus register. 1 = R40002, etc. There are many articles on-line that explain exactly how Modbus RTU and TCP communications work.