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How to

How to


Products: MP-V, RP-C, RP-V
Functionalities: Hardware
Product version: 2022, 2023, 2024, 7.0
4/5/2022

Installing an RS-485 Adapter

You install an RS-485 adapter using screws to properly fasten the device. You can also fasten the device using cable ties or mount the devices in line with a cable run.

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The Isolated RS-485 Adapter (SXWISORS48510001) is used when connecting a BACnet/IP controller that supports reconfiguration for BACnet MS/TP communication to a BACnet MS/TP (RS-485) network. The Isolated RS-485 Adapter has an isolated RS-485 transceiver and is used when the BACnet MS/TP (RS-485) network is comprised of isolated controllers, such as MNB BACnet devices (zone controllers) and selected others.

 
action_zoom_plus_stroke Isolated RS-485 Adapter
Figure: Isolated RS-485 Adapter

The adapter converts the BACnet/IP controller RS-485 Com port RJ45 interface to screw terminals, which is required to be able to connect the controller to a BACnet MS/TP network and the RS-485 Com port screw terminals of an automation server.

A separate connection cable is required to connect the adapter to the controller. The cable is not included and needs to be purchased separately.

The RS-485 Adapter can be used with BACnet/IP controller models that support reconfiguration for BACnet MS/TP communication. For more information, see SpaceLogic RS-485 Adapters .

The BACnet/IP controller needs to be reconfigured to communicate with automation servers based on the BACnet MS/TP protocol, instead of the BACnet/IP protocol. For more information, see RP-C BACnet MS/TP Support .

RS-485 Adapter Device Installation

The RS-485 adapter has a protruding bracket on each long side with a mounting hole to facilitate installation of the device with two screws (not included). The device can also be fastened using cable ties or mounted in line with a cable run. The RS-485 adapter is suitable for plenum use.

For more information, see Installing an RS-485 Adapter .

Isolated RS-485 Adapter Connection and Wiring

The Isolated RS-485 Adapter is equipped with an RJ45 port for connection to a BACnet/IP controller RS-485 Com port and a 4-position removable screw terminal block for connection to a BACnet MS/TP (RS-485) network.

For more information, see Isolated RS-485 Adapter Connection and Wiring .

RS-485 Adapter Regulatory Compliance and Approvals

This section provides information on regulatory compliance and approvals for the RS-485 Adapters.

For more information, see RS-485 Adapter Regulatory Compliance and Approvals .

Specifications

Electrical
DC input supply voltage
24 VDC (powered by the BACnet/IP controller)
Maximum power consumption
0.4 W
Environment
Ambient temperature, operating
0 to 50 °C (32 to 122 °F)
Ambient temperature, storage
-40 to +70 °C (-40 to +158 °F)
Humidity
Maximum 95 % RH non-condensing
Material
Plastic flame rating
UL94 V-0
Plenum rating
UL 2043
Ingress protection rating
IP 20
Mechanical
Dimensions
See drawing below
 
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Weight
80 g (2.82 oz)
Installation
Connection to RS-485 Com B via Cat 5 UTP cable (not included) a
a) For more information, see chapter “Connecting an Isolated RS-485 Adapter”.
Installation options
The adapter can be fastened using screws or cable ties or mounted in line with a cable run. a
  
Approved for plenum installation (UL 2043)
a) For more information, see chapter “Installing an RS-485 Adapter”.
Maximum Cat 5 UTP cable length
0.3 m (12 inches)
The Cat 5 UTP cable is not included.
Hardware
Connectors
RS-485, 4-pole removable screw terminal block
  
RS-485, RJ45 port
RS-485 transceiver characteristics
Transceiver type
Failsafe
  
Isolated
External biasing
None required
Total Unit Load (UL) per device
0.18 UL

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The Non-isolated RS-485 Adapter (SXWNISORS48510001) is used when connecting an RP or MP controller to the following networks:

  • BACnet MS/TP (RS-485) network including non-isolated controllers

  • Modbus RTU (RS-485) subnetwork including Modbus devices

 
action_zoom_plus_stroke Non-isolated RS-485 Adapter
Figure: Non-isolated RS-485 Adapter

The adapter converts the controller RS-485 Com port RJ45 interface to screw terminals, which is required to be able to connect the controller to a BACnet MS/TP or Modbus RTU subnetwork.

A separate connection cable is required to connect the adapter to the controller. The cable is not included and needs to be purchased separately.

BACnet MS/TP network including non-isolated controllers

The Non-isolated RS-485 Adapter is used when connecting an IP based RP or MP controller (BACnet/IP controller) to a BACnet MS/TP network that includes non-isolated controllers, such as the b3 BACnet family of zone controllers.

The adapter can be used with BACnet/IP controller models that support reconfiguration for BACnet MS/TP communication. For more information, see SpaceLogic RS-485 Adapters .

The BACnet/IP controller needs to be reconfigured to communicate with automation servers based on the BACnet MS/TP protocol, instead of the BACnet/IP protocol. For more information, see Allocating Flexible Ports .

Modbus RTU subnetwork including Modbus devices

The Non-isolated RS-485 Adapter is used when connecting an RP or MP controller to a Modbus RTU subnetwork that includes Modbus devices that are non-isolated or isolated.

The adapter can be used with RP and MP controller models that support Modbus RTU communication. For more information, see SpaceLogic RS-485 Adapters .

One of the controller's RS-485 port(s) needs to be configured for Modbus RTU communication. For more information, see Allocating Flexible Ports .

RS-485 Adapter Device Installation

The RS-485 adapter has a protruding bracket on each long side with a mounting hole to facilitate installation of the device with two screws (not included). The device can also be fastened using cable ties or mounted in line with a cable run. The RS-485 adapter is suitable for plenum use.

For more information, see Installing an RS-485 Adapter .

Non-isolated RS-485 Adapter Connection and Wiring

The Non-isolated RS-485 Adapter is equipped with an RJ45 port for connection to an RP or MP controller RS-485 Com port and a 4-position removable screw terminal block for connection to a BACnet MS/TP (RS-485) network or Modbus RTU (RS-485) subnetwork.

For more information, see Non-isolated RS-485 Adapter Connection and Wiring .

RS-485 Adapter Regulatory Compliance and Approvals

This section provides information on regulatory compliance and approvals for the RS-485 Adapters.

For more information, see RS-485 Adapter Regulatory Compliance and Approvals .

Specifications

Electrical
DC input supply voltage
0 V
Maximum power consumption
0 W
Environment
Ambient temperature, operating
0 to 50 °C (32 to 122 °F)
Ambient temperature, storage
-40 to +70 °C (-40 to +158 °F)
Humidity
Maximum 95 % RH non-condensing
Material
Plastic flame rating
UL94 V-0
Plenum rating
UL 2043
Ingress protection rating
IP 20
Mechanical
Dimensions
See drawing below
 
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Weight
40 g (1.41 oz)
Installation
Connection to RS-485 Com A or Com B via Cat 5 UTP cable (not included) a
a) For more information, see chapter “Connecting a Non-isolated RS-485 Adapter”.
Installation options
The adapter can be fastened using screws or cable ties or mounted in line with a cable run. a
  
Approved for plenum installation (UL 2043)
a) For more information, see chapter “Installing an RS-485 Adapter”.
Maximum Cat 5 UTP cable length
0.3 m (12 inches)
The Cat 5 UTP cable is not included.
Hardware
Connectors
RS-485, 4-pole removable screw terminal block
  
RS-485, RJ45 port

To install an RS-485 adapter

  1. Refer to the dimensional drawing before installing the RS-485 adapter.

     
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  2. Ensure that you have the proper mounting hardware and anchoring system.

  3. Find a suitable location and surface on which to mount the RS-485 adapter.

  4. Hold the RS-485 adapter against the surface and mark the place where the two drill holes should be on the surface.

  5. Fasten the RS-485 adapter on the surface using two number 6, 8, M3, or M4 sheet metal and/or self-tapping screws with rounded or flanged hex head and wall anchors (optional).

    Note:

    The screws and wall anchors are not included.

     
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You can now wire the RS-485 adapter.

See Also

  • Isolated RS-485 Adapter
  • Connecting an Isolated RS-485 Adapter
  • Wiring the Screw Terminals on an Isolated RS-485 Adapter
  • Non-isolated RS-485 Adapter
  • Connecting a Non-isolated RS-485 Adapter
  • Wiring the Screw Terminals on a Non-isolated RS-485 Adapter