Temperature Setpoint
The Touch Point panel has a feature of setting a temperature setpoint and sending it through communication protocols to any temperature control device. The temperature setpoint value is configurable through the following parameters or in the iSMA Configurator:
EFFECTIVE_SETPOINT: indicates a sum of the temperature actual setpoint value and offset. The register contains a value multiplied by 10;
- Modbus register: 41502;
- BACnet object: AI3, property: Present Value;
SETPOINT_VALUE: allows to set an actual temperature setpoint value. After reset, the DEFAULT_SETPOINT register's value is set to the SETPOINT_VALUE register. The register contains a value multiplied by 10. The value range is 0-500 (0-50oC);
- Modbus register: 41501;
- BACnet object: AV56, property: Present Value;
DEFAULT_SETPOINT: contains a temperature default setpoint value. The default setpoint is set as a setpoint value after the panel's restart or power supply reconnection (the value of the DEFAULT_SETPOINT register is written to the SETPOINT_VALUE register). The register contains a value multiplied by 10. In the range of 0-500 (0-50oC), the default value is 210 (21oC);
- Modbus register: 41503;
- BACnet object: AV57, property: Present Value;
OFFSET_SETPOINT: allows to set an offset value to the temperature setpoint (correction to the setpoint's value). The register contains a value multiplied by 10. In the range of 0-500 (0-50oC), the default value is 0 (0oC);
- Modbus register: 41504;
- BACnet object: AV58, property: Present Value.
Above parameters are limited to certain values stored in the following parameters:
SETPOINT_LOW_LIMIT: allows to set a minimum temperature setpoint value, which can be set by user. The register contains a value multiplied by 10. The default value is 180 (18oC);
- Modbus register: 41505;
- BACnet object: AV56, property: Low Limit;
SETPOINT_HIGH_LIMIT: allows to set a maximum temperature setpoint value, which can be set by user. The register contains a value multiplied by 10. The default value is 240 (24oC);
- Modbus register: 41506;
- BACnet object: AV56, property: High Limit;
OFFSET_RANGE: allows to set a limit for temperature offset value. The register contains a value multiplied by 10. In the range of 0-500 (0-50oC), the default value is 30 (3oC);
- Modbus register: 41507;
- BACnet object: AV59, property: Present Value.
User Interface for Temperature Setpoint
In the Touch Point device, the temperature setpoint can also be configured using a touch panel (see Operating User Interface). This way, it is possible to change either the SETPOINT_VALUE or OFFSET_SETPOINT depending on the configuration of bits 1 and 2 of the SETPOINT_CONFIGURATION and the SETPOINT_STEP and EXIT_EDIT_TIME parameters:
SETPOINT_CONFIGURATION, bit 1: EDITABLE: enables or disables editing of the temperature setpoint locally from the panel;
- Modbus register: 41513;
- BACnet object: AV56, property: 4200;
SETPOINT_CONFIGURATION, bit 2: OPERATING_MODE: allows to set the operating mode of the temperature setpoint configuration;
- Modbus register: 41513;
- BACnet object: BO55, property: Out Of Service;
Bit | Name | 0 | 1 |
|---|---|---|---|
1 | Editable | Not editable | Editable (default) |
2 | Operating mode | Changing offset | Changing setpoint (default) |
For description of all bits of the SETPOINT_CONFIGURATION parameter see User Interface Parameters.
SETPOINT_STEP: allows to set a temperature's setpoint step value. If the setpoint is changed locally from the panel (using -/+ buttons), a single press of a button causes a setpoint change with the step value stored in this register. The setpoint can be changed in the range determined by setpoint limits stored in the SETPOINT_LOW_LIMIT and SETPOINT_HIGH_LIMIT parameters.
The setpoint's step value is also automatically adjusted to the setpoint display precision. If the bit 4 of the SETPOINT_CONFIGURATION register is true, the setpoint value is displayed with one decimal place. In such case, the setpoint's step value is also adjusted to one decimal place. The register contains a value multiplied by 10. The default value is 10 (1oC);
- Modbus register: 41508
- BACnet object: AV56, property: 4206;
EXIT_EDIT_TIME: allows to set the time after which edition of any editable parameter is finished. The parameter is set in seconds. The default value is set to 5 seconds;
- Modbus register: 40224
- BACnet object: AO17, property: Present Value.
How to Change the Temperature Setpoint on the Touch Panel?
Short press + or - button to enter an edit mode (display should start blinking with a current value);
Change the temperature setpoint value by steps set in the SETPOINT_STEP:
- button decreases the value (multiple times for long press);
+ button increases the value (multiple times for long press).
Reaching a limit value will be signaled with a double beep.
Device will automatically exit the edit mode after the time set in the EXIT_EDIT_TIME expires from a last interaction.
LEDs
The device shows a difference between the EFFECTIVE_SETPOINT and TEMPERATURE_SENSOR values on an LEDs ladder, which indicates the following:
no LEDs light up: a temperature in the room is near the EFFECTIVE_SETPOINT value;
blue LEDs light up: a temperature in the room is higher than the EFFECTIVE_SETPOINT value, cooling;
red LEDs light up: a temperature in the room is lower than the EFFECTIVE_SETPOINT value, heating.
Number and brightness of LEDs indicate exact difference of the values:
every 0.5 degree of difference lights up a next LED half way up;
every 1 degree of difference lights up a next LED to maximum;
a difference greater than 3 degrees lights up all 3 LEDs and does not change further;
changes are controlled with 0.2 degrees hysteresis to prevent LEDs flashing.