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Concept

Concept


Products: MP-V
Functionalities: Hardware
Product version: 2022, 2023, 2024
11/4/2024

MP-V BACnet MS/TP Support

The MP-V controllers can be reconfigured to communicate with the hosting server based on the BACnet MS/TP protocol, instead of the BACnet/IP protocol. An adapter is required for converting the controller RS-485 Com port with RJ45 interface to screw terminals.

Note:

The MP-V BACnet MS/TP support only applies to MP-V controllers with part numbers SXWMPV7AX10002 and SXWMPV9AX10002. For more information, see Differences Between MP-V Hardware Versions .

The support for connecting MP-V controllers to a BACnet MS/TP (RS-485) network for communication with an automation server (AS-P or AS-B) enables retrofitting of MNB and b3 BACnet devices on the network while reusing parts of the existing cabling and equipment. For more information, see RS-485 Communications .The support for both BACnet IP and BACnet MS/TP protocols also facilitates a transition from a BACnet MS/TP (RS-485) network to an IP based network. The controller can be configured to use either protocol.

Note:
  • “MNB BACnet devices” refers to Schneider Electric (TAC I/A Series) MicroNet BACnet (MNB) zone controllers.

  • “b3 BACnet devices” refers to Schneider Electric (Andover Continuum) b3 BACnet zone controllers.

An RJ45 to screw terminal block adapter and a separate connection cable is required to connect the MP-V controllers to the BACnet MS/TP (RS-485) network. For more information, see RS-485 Adapters .

The RS-485 adapters are available in two models:

  • Isolated RS-485 Adapter (SXWISORS48510001)

  • Non-isolated RS-485 Adapter (SXWNISORS48510001)

The RS-485 adapters can be ordered from Schneider Electric using the above part numbers.

The isolated adapter is designed to be used when connecting MP-V controllers to a BACnet MS/TP (RS-485) network with MNB devices.

The non-isolated adapter is designed to be used when connecting MP-V controllers to a BACnet MS/TP (RS-485) network with b3 BACnet devices.

The cable is not included and needs to be purchased separately.

To connect the adapter, it is recommended to use a Cat 5 (or higher) unshielded, straight-through wired cable with eight conductors (four twisted pairs) and RJ45 connectors. The recommended maximum cable length is 0.3 m (12 inches). The wire size (cross-sectional area) should be 22 to 26 AWG (0.34 to 0.14 mm²). When MP-V controllers are installed in a space that handles conditioned air or return air, the BACnet MS/TP (RS-485) network 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 length of the cable for connection of the RS-485 adapter to the controller does not exceed 0.3 m (12 inches).

  • 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.

You need to configure the RS-485 Com A (RJ45) port on the MP-V controller for connection to the BACnet MS/TP (RS-485) network. The RS-485 Com A port can either be used for connection of an isolated adapter or a non-isolated adapter

For more information, see MP-V Communication Ports .

For more information, see Allocating Flexible Ports .

As part of the commissioning process for the device, you also need to configure the baud rate for the automation server BACnet MS/TP (RS-485) bus. For more information, see MS/TP Communications Baud Rate .

 
action_zoom_plus_stroke Location of the RS-485 Com A port on the MP-V controllers
Figure: Location of the RS-485 Com A port on the MP-V controllers
Automation Server BACnet MS/TP (RS-485) Network with MNB BACnet devices

In retrofit projects with MNB devices, the MP-V controllers can be mixed with MNB devices on the BACnet MS/TP (RS-485) network.

The isolated RS-485 adapter is used for connection of the MP-V controller.

The isolated RS-485 adapter is connected to the RS-485 Com A port on the MP-V controller.

Notice

BACNET MS/TP NETWORK OUTAGE OR PERFORMANCE DEGRADATION

For a BACnet MS/TP network with MNB BACnet devices, ensure you use an isolated RS-485 adapter (SXWISORS48510001) connected to the MP-V controller's Com A port.

Failure to follow these instructions can result in BACnet MS/TP network outage or performance degradation.

 
action_zoom_plus_stroke Examples of automation server BACnet MS/TP (RS-485) networks mixing MP-V controllers with MNB BACnet devices
Figure: Examples of automation server BACnet MS/TP (RS-485) networks mixing MP-V controllers with MNB BACnet devices
Automation Server BACnet MS/TP (RS-485) Network with b3 BACnet devices

In retrofit projects with b3 BACnet devices, the MP-V controllers can be mixed with b3 BACnet devices on the BACnet MS/TP (RS-485) network.

The non-isolated RS-485 adapter is used for connection of the MP-V controller.

The non-isolated RS-485 adapter is connected to the RS-485 Com A port on the MP-V controller.

 
action_zoom_plus_stroke Examples of automation server BACnet MS/TP (RS-485) networks mixing MP-V controllers with b3 BACnet devices
Figure: Examples of automation server BACnet MS/TP (RS-485) networks mixing MP-V controllers with b3 BACnet devices
  • Hardware Overview
  • MP-V Controllers
  • RS-485 Adapters
  • RS-485 Communications
  • Wiring
  • MP-V Communication Ports
  • Differences Between MP-V Hardware Versions
  • Allocating Flexible Ports
  • MS/TP Communications Baud Rate
  • Configuring MS/TP Network Settings