Setting a device address - Metasys - LIT-12011034 - General System Information - Metasys System - Release 11.0

MS/TP Communications Bus Technical Bulletin

Brand
Metasys
Product name
Metasys System
Document type
Technical Bulletin
Document number
LIT-12011034
Version
Release 11.0
Revision date
2022-02-07
Language
English

For most devices on an MS/TP bus, the (non-supervisory) device address is set by positioning the Rotary or DIP switches on the device’s address DIP switch block. The DIP switch blocks are binary switch blocks, with each switch representing a binary numerical value when the switch is in the ON position. The CGM and CVM controllers have three rotary switches for setting the device address.

The device address set on the address DIP switch block or rotary switches applies to the device connection on the bus where the device is not the bus supervisor. For example, the rotary switches on CGMs or CVMs and the DIP switches on FACs, FECs, or VMAs (manager devices) set the device address for the device connection to the FC bus (or Remote Field Bus). If the CGM, CVM, FAC, FEC or VMA also supervise an SA bus, the controller's address on an SA bus is 0 by default (Figure 1).

An IOM or XPM has only one device connection, which can connect to either an FC bus or an SA bus (but not both); therefore, the device address set on an IOM or XPM applies to the bus to which the IOM is connected. (An IOM or XPM is never a bus supervisor.)

Figure 1. MS/TP Bus showing FC Bus and SA Bus addresses
Table 1. Valid MS/TP Bus address values and address ranges for MS/TP Bus devices

Address value/ Address range

Class

Devices

0

Bus Supervisor

FC Bus: NAE, NCE, SNE, or SNC

SA Bus: NCE, SNC, CGM, CVM, CGE, CVE, FAC, FEC, or VMA

Remote Field Bus: BACnet Router

C4-CGMs, C4-CVMs, CH-PCA, CH-PCG, or CH-PCV

1

Reserved for JCI use

Reserved for the Field Inspection Tool (FIT)

2

Reserved for JCI use

Reserved for Mobile Access Portal (MAP) and ZFR/ZFRPro Wireless Field Bus Converter

3

Reserved for JCI use

DIS1710 Local Controller Display

4–127

C4-CGMs, C4-CVMs, CH-PCA,

Manager Range

FC Bus:

CGMs, CVMs, FACs, FECs, VMAs, IOMs, XPMs, and TECs.

Remote Field Bus: CGMs, CVMs, FACs, FECs, VMAs, IOMs, XPMs and TECs.

SA Bus: IOMs and XPMs
Note: On applications using an NCE, the address value 4 is reserved for the NCE’s integral field controller. On applications using ZFR1810 coordinators, address values 120 to 127 are reserved for multiple coordinators.

128–254

Subordinate Range

Subordinate devices, VSDs, and NS network sensors on the SA Bus. Not Supported on the FC bus.

198

Reserved

VAV Balancing Sensor (handheld)

199

Reserved

Most NS Series Network Sensor models or VAV Balancing Sensor (wall-mounted)

200–219

Reserved

NS Series Network Sensors

255

Broadcast

Do not apply address 255 to any device.

Important: On FACs, FECs, VMAs, and IOMs only, the 128 DIP switch on the controller’s device address DIP switch block is a mode switch used to enable the controller to operate in a wireless mode using the ZFR Series Wireless Field Bus System. On any FAC, FEC, VMA, or IOM that is hardwired to an MS/TP Bus, set the 128 DIP switch to the OFF position. Operating any FAC, FEC, VMA, or IOM that is hardwired to an MS/TP Bus with the controller’s 128 DIP switch set to the ON position results in communication failure on the bus.

As you set the device address on controllers with dip switch blocks, the best practice is to set the highest switch value first, then the next highest switch value, and so on, until the total of the switch values equal the intended device address. For example, positioning switches 16, 4, and 1 to ON sets the device address to 21 for a device on the FC bus.

Figure 2. Setting the device address and wireless operation mode on the address DIP switch block

Notes:

  • You must set switch 128 to OFF on all Metasys field controllers that are hardwired to an FC bus. Set switch 128 to ON only on FACs, FECs, VMAs, and IOMs that operate on a Metasys ZFR Series Wireless Field Bus.
  • Devices may go offline momentarily when a device address is changed on an active bus. A device reset is not required on equipment controllers or supervisory engines after changing the MS/TP address.

Some devices, such as the TEC36xx Series thermostats and third-party MS/TP devices, use their own configuration settings to establish the device address for their connection to the bus. Drilling down through menus in software configures the addresses of the NS8000 graphical display model and the TEC3000 series. Refer to the device manufacturer’s product documentation for instructions on setting the device address. The device address values for TEC thermostats and all third-party devices must comply with the rules and ranges described previously.

Rotary switch dials

The SNC has 3 rotary switch dials labeled Controller Number for setting the controller number, which can be numbered from 000 to 999. The switches are shipped from the factory set to 000. You can use them to set a decimal number from 000 to 999 as a unique identifier for each SNC. The numbers are ordered from left to right, most significant bit (MSB) to least significant bit (LSB) when the controller is oriented as shown in the following figure where the switches are set to 1 2 3 (controller address 123).

Figure 3. Rotary switch device addressing