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Concept

Concept


Products: MP-C, SpaceLogic Sensors
Functionalities: Hardware
Product version: 2023, 2024
6/20/2023

MP-C Sensor Bus

The MP-C sensor bus allows SpaceLogic Sensor devices to be connected to the controller.

Note:

MP-C controller models with “-M” in the product name do not support the sensor bus.

The sensor bus is a proprietary RS-485 bus, which provides both 24 VDC power supply (2 W) and communications for the sensors.

The maximum total length of the sensor bus is 61 m (200 ft). The sensor bus uses a Cat 5 (or higher) unshielded, straight-through wired cable with eight conductors (four twisted pairs) and RJ45 connectors. The wire size (cross-sectional area) should be 22 to 26 AWG (0.34 to 0.14 mm²). When the controller is installed in a space that handles conditioned air or return air, the sensor bus cables and IP network cables frequently must be plenum-rated to meet applicable building codes. For more information, see Wiring .

Notice

LOSS OF COMMUNICATION

  • Ensure that the total length of the sensor bus does not exceed 61 m (200 ft).

  • Use a Cat 5 or higher unshielded twisted pair cable with eight conductors (four twisted pairs), a cross-sectional area of 22 to 26 AWG (0.34 to 0.14 mm 2 ), and a rating that meets the requirements of the target environment.

Failure to follow these instructions can result in loss of communication.

Note:

The labeling of the RS-485 port differs between different versions of the MP-C controller models. In previous versions, the port is labeled “Sensor Bus”.

By default, the MP-C controller's RS-485 Com A port is configured and allocated for the sensor bus. For more information, see Communication Ports on MP-C-15A, -18A, -18B, -24A, and -36A .

 
action_zoom_plus_stroke Location of the RS-485 Com A port on the MP-C controllers

Location of the RS-485 Com A port on the MP-C controllers

You can connect a single SpaceLogic Sensor to the sensor bus, or you can connect two to four SpaceLogic Sensor devices in a daisy-chain configuration.

Note:

When connecting SpaceLogic Sensor devices to the sensor bus through a daisy-chain configuration, the sensor bus ports on the SpaceLogic Sensor are interchangeable.

The maximum number of SpaceLogic Sensor devices that can be connected to the sensor bus is variable depending on the power consumption for the selected SpaceLogic Sensor model and the combination of cover and sensor base type.

When calculating the power consumption to validate your sensor bus configuration, ensure that you add the power consumption (mW) for all SpaceLogic Sensor models, sensor bases, covers, and devices used on the sensor bus to determine the total power consumption. The sensor bus can supply maximum 2000 mW. SpaceLogic Sensor combinations totalling more than 2000 mW are not supported. The following table can be used for calculating the total power consumption.

Description

Model Number

Power (mW)

Sensor base with temperature sensor

SXWSBTXXXSXX

90

Sensor base with temperature and humidity sensors

SXWSBTHXXSXX

90

Sensor base with temperature and CO 2 sensors

SXWSBTXCXSXX

490

Sensor base with temperature, humidity, and CO 2 sensors

SXWSBTHCXSXX

490

Blank cover

SXWSCBXSELXn a

0

Blank cover with occupancy sensor

SXWSCBPSELXn a

20

3-button cover (buttons for override and setpoint control)

SXWSC3XSELXn a

190

3-button cover (buttons for override and setpoint control) with occupancy sensor

SXWSC3PSELXn a

210

Touchscreen display cover

SXWSCDXSELXn a

190

Touchscreen display cover with occupancy sensor

SXWSCDPSELXn a

210

Touchscreen display cover with light control buttons

SXWSC2XSELXn a

190

Touchscreen display cover with light control buttons and occupancy sensor

SXWSC2PSELXn a

210

Touchscreen display cover with light and blind control buttons

SXWSC4XSELXn a

190

Touchscreen display cover with light and blind control buttons and occupancy sensor

SXWSC4PSELXn a

210

Complete SpaceLogic Sensor model with temperature sensor, buttons for override and setpoint control, and LCD display cover

SXWSATXXXSLn a

80

Complete non-communicating b SpaceLogic Sensor model with resistive temperature sensor (10 kohm type 3 thermistor) and blank cover

SLAnXXX c

SXWSATXXXRXX d

0

SpaceLogic Bluetooth Adapter e

SXWBTAECXX10001

300 e

  1. The last character (“n”) of this model number indicates the housing: X (Medium matte white), W (Optimum glass white), or B (Optimum glass black).
  2. The SpaceLogic resistive temperature sensor is not designed to be connected to the sensor bus, but instead is connected to I/O points/terminals on the BACnet/IP controller using a two-wire connection.
  3. The fourth character (“n”) of this model number indicates the housing: S (Medium matte white), W (Optimum glass white), or B (Optimum glass black).
  4. The model number SXWSATXXXRXX is replaced by SLASXXX.
  5. The SpaceLogic Bluetooth Adapter is only temporarily connected to the SpaceLogic Sensor for commissioning and servicing, so it is not necessary to include the adapter in the power budget.

To summarize the power conditions, the sensor bus supports the following key SpaceLogic Sensor combinations:

  • Blank covers: Up to four sensors of any combination of sensor base types

  • 3-button and touchscreen covers:

    • Up to two sensor bases with CO 2 option

    • Up to four sensor bases without CO 2 option

  • SpaceLogic LCD temperature sensors: Up to four sensors are supported

Note:

The RS-485 Power Adapter can be used to supply 24 VDC power to the MP controller sensor bus so that the maximum number of sensor bases with CO 2 option can be increased from two to four sensor bases. The adapter can be ordered from Schneider Electric using the part number SXWNISORS485P10001.

 
action_zoom_plus_stroke Examples with one SpaceLogic Sensor and four SpaceLogic Sensor devices connected to an MP-C controller in a daisy-chain configuration

Examples with one SpaceLogic Sensor and four SpaceLogic Sensor devices connected to an MP-C controller in a daisy-chain configuration

Each SpaceLogic Sensor has two 2-position DIP switches, which are used to give the sensor a unique address on the sensor bus. An incorrectly configured or improper DIP switch can cause two sensors to have the same address on the sensor bus, which means that both sensors will be offline. For more information, see SpaceLogic Sensors .

Notice

LOSS OF COMMUNICATION

Ensure that the address DIP switches on the SpaceLogic Sensor are configured to give the sensor a unique address on the sensor bus.

Failure to follow these instructions can result in loss of communication.

Note:

SpaceLogic Sensor devices connected to the sensor bus through a daisy-chain configuration can be assigned addresses regardless of the order in which the sensors appear in the daisy chain. For example, sensor number 1 can have the address 4, sensor number 2 can have the address 3, and so on.

  • Hardware Overview
  • MP-C Controllers
  • MP-C Models
  • Wiring
  • Communication Ports on MP-C-15A, -18A, -18B, -24A, and -36A
  • Connecting SpaceLogic Sensor Devices to an MP Controller
  • SpaceLogic MP-C Pro
  • SpaceLogic Sensors
  • RS-485 Power Adapter