Multi-proxy modbus connection

[gianluca_depascali@hotmail.it]

Hi everybody!

I have a problem about modbus writing.
In this work there is two airconditioning connected to modbus and it have the same modbus ID (49). I can't change it because the company don't allow it.
I connected this two device to the two different port of RS485.
But the problem is to open comunication with proxy. You can't specificate where it have to open comunication. 
I use this script:

Code:

-- get value of object with group address 1/1/1
setpoint_z2 = grp.getvalue('1/1/1')
setpoint_z2_mb = setpoint_z2*2


-- proxy works only when RTU is enabled in Modbus settings
mb = require('mbproxy').new()
mb:setslave(49)

-- set register at address 6
mb:writeregisters(6, setpoint_z2_mb)

-- read from address 6
value_rmb = mb:readregisters(6)

[admin]

You can pass the RTU port number (1, 2 or 3) when creating a proxy connection like this:

Code:

require('mbproxy').new(2) -- use RTU 2

Make sure to configure and enable both ports in RTU settings.