The T3 Series are general purpose input / ouput modules for building integrators. Available in several input/output configurations, the T3 Series modules provide convenient termination for field devices and interfacing to your HVAC, lighting, temperature sensors, and other typical building automation applications. Each of the analog inputs can be jumper configured for signals of either 0-5V, 0-20mA, or dry contact. The outputs are available in dry contacts 1amp/output, 0-10V analog, and PNP sinking. The modules are slave devices that can be easily controlled via the RS485 serial interface using the industry standard Modbus Protocol.

Highlights:
-Surge-protected analog inputs with 10-bit resolution.
-Outputs can individually be switched to ON, OFF, AUTO.
-High impact plastic enclosure provides durability in COM-mercial environments.
-Standard modbus protocol allows for up to 254 unique de-vices on one RS485 network.

Input:
Each input of a T3 Module can be jumper-configured in 1 of 3 ways:
0-5V Signal
0-20mA Signal
Dry Contact, Thermistor
The value of each input is stored as a 10-bit number in the respective modbus register.
The registers addresses are as follows:

A 5V, or 20mA, would give a reading of 1024. Each input has a corresponding LED which will light up if the value of the input is greater than 512. For more info on reading the input registers, see the section on Serial Communications.

Output:
The state of each output is determined by its corresponding switch position. The switches have 3 states - 'hand', 'off', and 'auto'. When switched to 'hand', the corresponding output will be switched on - 10V for analog, contacts closed off from the relay, or 0V for sinking outputs. When switched to 'off', the output will be set to 0V for analog, open contact for relay, or open circuit for sinking outputs. When switched to 'auto', Analog outputs will be set to the level stored in the corresponding MODBUS output registers. For Digital or Sinking outputs, a register value 0 is deactivate and register value 1000 is activated.


These registers can be changed using the RS485 serial interface. For analog outputs, a 0 corresponds to 0V. Likewise, a 1024 corresponds to 10V. For relay or sinking outputs, the output will be activated by any number greater than 512. The output registers are stored in RAM, thus the contents of each register will be lost upon power-off. Each output has a corresponding LED which will light up if the value of the output is greater than 512 (5V). For more info on writing the output registers, see the section on Serial Communications.

Baudrate
All T3-Modules have adjustable Baudrates set by MODBUS registery 15. By default baud is set to 19.2kbps.
Value 1 will set the baud to 19200 bps.
Value 0 will set the baud to 9600 bps.