Unable to communicate with power energy modules

[johnny_holden]

I'm struggling with getting this plugin to work with PZEM-014/016 AC power energy modules. However, I got it working correctly on a program called 'Simply Modbus Master'.
Gateway physical layer setting are set as per instructions (9600,8,1,no parity) with a device using 04-Input Register with register address 1. However I get following:

Error in ReadValue: Checksums failed to match 1, 144, 9 != 1, 144, 9, 212, 82
Error in Read: Checksums failed to match 1, 144, 9 != 1, 144, 9, 212, 82
Read error for Energy-Volts
and so on..

On Simply Modbus Master, I get the following and seems to work fine without any hardware, driver changes (obviously plugin disabled)

I've attached trace log of plug-in.

Any suggests?

I am a novice at modbus, so please be kind :-)

I read this plugin is due for re-write. When is this likely to be completed? I've just purchased and feel a little disappointed it's not working.

[johnny_holden]

Panic over! I have it communicating. I was stupidly blinded to the fact I didnt change Parity to none!
However, I'm struggling with getting some data and would like some help..
I'm using PZEM-014 and PZEM-016 AC Modules (More info HERE)
I read the voltage value with scale 0.1 but not sure how to measure the current, power and energy with 2x 16bits. How do I combine and scale the reading?

[beerygaz]

Try selecting an Int32 as the return value for your register in the plugin. It should read the two consecutive Int16 registers and combine them into a single 32-bit value. Check you "big endian" settings on the gateway too, it looks like these are big endian values.