Connecting two T3 to each other Via Rs-485

[trading]

HI guys
is it possible to read data via modbus Rs-485 with one controller from another controller ?
both controller are from T3 family.
what about ethernet ?
and how many datapoint can read ?

[maurice]

Yes of course, please search this forum for ‘network programming’

Network Programming Overview

Here is an overview of the typical scenarios for referring to remote Bacnet and Modbus devices in the T3000 programming environment. Be sure to update FIRST your T3000 front end, and then also update the T3 controller firmware as some features are recent. [NetworkProgramming4] Two T3 controllers on the LAN For the two T3 controllers on the Ethernet lan at tabs1 and 2, we use programming lines 1 and 2 to read data from another controller. VAR1 = 2IN1 where 2 refers to any other panel ID on th…

Edit:
I see we’re missing a section on how to pass network points from one controller to the next in the case where they are connected only by RS485. In fact its the same as when connecting over Ethernet and is as easy as referring to the IO point. If the outside air is on Panel2, input1 and you would like to write a program on panel 1 which makes use of that point, this is how it would look:

10 IF 2IN1 < IN1 - 1 THEN START FREECOOL
20 IF 2IN1 > IN1 THEN STOP FREECOOL

You can transfer up to 128 points over the network in this way.

Its the same whether you are connected over RS485 or Ethernet, just use the PANEL# / OBJECT / ITEM# notation and the system will take care of the rest.

[To be done] Allow user labels from remote controller points. Currently we have to use the 2IN1 in our program but we would like to use the friendlier label, OAT instead.