This is a Step By Step guide to setup the ISMA devices to be used with Tridium using Modbus connection.

Step 1 - Hardware setup

 First thing you have to do is to set some parameters on the device.  Under the front cover of the device you can see 1 ON/OFF switch and 2 rotary switches:

Step 1. To determine the address in the network, module provides two rotary switches S1 and S2 located on the top panel device. It is possible to set the device address from 0 to 99. 

The formula for setting the address: 

Address = S2 x 10 S1 

The switches set as in the picture means that the device will have address 11.

Step 2. Transmission speed is determined by S3 switch (sections 1, 2 and 3) in accordance with the following table:

Step 3. Protocol selection is done by sections 4 and 5 of the S3 switch according to the table below:

So to use Modbus network you need to have both switches in OFF position.

So to use Modbus network you need to have both switches in OFF position.

Tridium setup

Step 1. You have to download the ISMA Module JAR file from our website (click here) and install the correct version of the JAR file in the AX version in which you want to use.

Step 2. After you have installed it, open the station on the Jace controller that the ISMA modules are communicating through RS485 port and go to Drivers. 

Step 3. Open the IsmaModule palette

Step 4. Drag and Drop the ModbusAsyncNetwork from the Modbus folder within the palette in the Driver Manager.

Step 5. Open the properties of the new Network, go to Serial Port and set:

         The COM port that the Isma module is connected to (Ex: COM2)

         The Baud Rate the same as the one that you set on the device like in the picture below: