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Room pressure controller (isolation room) · BACnet points list

Johnson Controls Triatek FMS-1655 Room Pressure Controller (BACnet MS/TP) BACnet points list

Updated 12 November 2026

Short answer

The FMS-1655 holds and monitors room differential pressure by driving a damper, with four configurable analog inputs, two thermistor inputs, four analog outputs, four digital inputs and four relays. It talks BACnet MS/TP or Metasys N2. The BACnet table has 90 objects: I/O, setpoints, alarm and warning limits, network-written values, airflow and volumetric offset, output overrides, deadbands, isolation mode commands and alarm status.

This page lists 90 BACnet objects for the Johnson Controls Triatek FMS-1655 Room Pressure Controller (BACnet MS/TP) — 60 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Johnson Controls’s own free documentation, linked below.

Manufacturer
Johnson Controls
Model
Triatek FMS-1655 Room Pressure Controller (BACnet MS/TP)
Equipment
Room pressure controller (isolation room)
Equipment type
Thermostats, sensors & meters
BACnet objects
90 (60 writable)
Transport
BACnet MS/TP
Firmware
Not stated
Default device instance
85000 + MAC address
Also known as
FMS-1655, FMS1655, Triatek FMS-1655, Triatek room pressure controller, JCI room pressure controller, LIT-12013120
Source document
FMS-1655 Room Pressure Controller Programming Manual · LIT-12013120 Rev. A · rev. 2018-08
Download CSV 90 rows Download EDE B.I.G.-EU JSON Manufacturer PDF ↗ Compare with your scan Download Easy BACnet Mobile App Google Play

Reference only, provided as-is: verify against Johnson Controls’s current documentation and the live device before use. Not official Johnson Controls information. Terms of use.

BMS integration notes: Johnson Controls Triatek FMS-1655 Room Pressure Controller (BACnet MS/TP)

Integration in brief

Map the room isolation mode command, the room pressure setpoint, the measured room pressure, the damper output and the primary alarm status. Write network variables (AV 43-46) only if the BAS supplies those values.

Minimum points to map

The short list most integrators start with — enough to run the unit from a BMS. Map more as the job needs.

ObjectNameWhyAccess
MO 1Primary solation ModeIsolation mode: 1 positive, 2 negative, 3 neutralWrite
AV 1AI-1 Setpoint (Room Pressure)Room pressure setpointWrite
AI 1Analog Input 1 (default: Isolation Pressure)Room (isolation) pressureRead
AO 1Analog Output 1 (default: Damper Position)Damper position outputRead
BI 1Digital Input 1 (default: Door Switch)Door switchRead
MO 3Primary Alarm StatusPrimary alarm: 1 normal, 2 warning, 3 alarmRead

Enable & remote start

Primary Isolation Mode (MSO 1) is writable: 1 positive, 2 negative, 3 neutral.

Sensors & values from the BMS

AV 43-46 are writable network variables for humidity, temperature, air changes and differential pressure sent from the BAS.

Network setup

Watch out for

Johnson Controls Triatek FMS-1655 Room Pressure Controller (BACnet MS/TP) BACnet objects

Type: AI, AO, AV, BI, BO, BV, MI/MO/MV (multi-state) · Access: Read read-only, Write writable, Command writable with a priority array.

90 of 90 shown
Type
Multi-state
Access
Show
Johnson Controls Triatek FMS-1655 Room Pressure Controller (BACnet MS/TP) BACnet Points List
DescriptionStates
AImin1Analog Input 1 (default: Isolation Pressure)Read
AI2Analog Input 2Read
AI3Analog Input 3Read
AI4Analog Input 4Read
AI5Thermistor Input 1Read
AI6Thermistor Input 2Read
AOmin1Analog Output 1 (default: Damper Position)Read
AO2Analog Output 2 (default: Anteroom Damper Control)Read
AO3Analog Output 3 (spare control output)Read
AO4Analog Output 4 (spare control output)Read
BImin1Digital Input 1 (default: Door Switch)Read
BI2Digital Input 2 (default: Anteroom Door Switch)Read
BI3Digital Input 3 (spare digital input)Read
BI4Digital Input 4 (spare digital input)Read
BO1Relay Output 1 (default: Primary Alarm Relay Output)Read
BO2Relay Output 2 (default: Spare Relay Output)Read
BO3Relay Output 3 (spare relay output)Read
BO4Not user-selectableRead
AVmin1AI-1 Setpoint (Room Pressure)Control setpointWrite
AV2AI-2 SetpointControl setpointWrite
AV3AI-3 SetpointControl setpointWrite
AV4AI-4 SetpointControl setpointWrite
AV5TI-1 SetpointControl setpointWrite
AV6TI-2 SetpointControl setpointWrite
AV7Air Change Rate based on Flow Input at AI-1Air change rate from flow inputWrite
AV8Air Change Rate based on Flow Input at AI-2Air change rate from flow inputWrite
AV9Air Change Rate based on Flow Input at AI-3Air change rate from flow inputWrite
AV10Air Change Rate based on Flow Input at AI-4Air change rate from flow inputWrite
AV11Alarm Relay 1 High SetpointAlarm relay trip limitWrite
AV12Alarm Relay 1 Low SetpointAlarm relay trip limitWrite
AV13Alarm Relay 2 High SetpointAlarm relay trip limitWrite
AV14Alarm Relay 2 Low SetpointAlarm relay trip limitWrite
AV15Alarm Relay 3 High SetpointAlarm relay trip limitWrite
AV16Alarm Relay 3 Low SetpointAlarm relay trip limitWrite
AV17Not user-selectableWrite
AV18Not user-selectableWrite
AV19AI-1 Low Alarm Setpoint (low pressure alarm)Alarm / warning limitWrite
AV20AI-1 Low Warning Setpoint (low pressure warning)Alarm / warning limitWrite
AV21AI-1 High Warning Setpoint (high pressure warning)Alarm / warning limitWrite
AV22AI-1 High Alarm Setpoint (high pressure alarm)Alarm / warning limitWrite
AV23AI-2 Low Alarm SetpointAlarm / warning limitWrite
AV24AI-2 Low Warning SetpointAlarm / warning limitWrite
AV25AI-2 High Warning SetpointAlarm / warning limitWrite
AV26AI-2 High Alarm SetpointAlarm / warning limitWrite
AV27AI-3 Low Alarm SetpointAlarm / warning limitWrite
AV28AI-3 Low Warning SetpointAlarm / warning limitWrite
AV29AI-3 High Warning SetpointAlarm / warning limitWrite
AV30AI-3 High Alarm SetpointAlarm / warning limitWrite
AV31AI-4 Low Alarm SetpointAlarm / warning limitWrite
AV32AI-4 Low Warning SetpointAlarm / warning limitWrite
AV33AI-4 High Warning SetpointAlarm / warning limitWrite
AV34AI-4 High Alarm SetpointAlarm / warning limitWrite
AV35TI-1 Low Alarm SetpointAlarm / warning limitWrite
AV36TI-1 Low Warning SetpointAlarm / warning limitWrite
AV37TI-1 High Warning SetpointAlarm / warning limitWrite
AV38TI-1 High Alarm SetpointAlarm / warning limitWrite
AV39TI-2 Low Alarm SetpointAlarm / warning limitWrite
AV40TI-2 Low Warning SetpointAlarm / warning limitWrite
AV41TI-2 High Warning SetpointAlarm / warning limitWrite
AV42TI-2 High Alarm SetpointAlarm / warning limitWrite
AV43Writable Network Variable – HumidityValue written by the BASWrite
AV44Writable Network Variable – TemperatureValue written by the BASWrite
AV45Writable Network Variable – Air ChangesValue written by the BASWrite
AV46Writable Network Variable – Differential PressureValue written by the BASWrite
AV47Device ID Offset (range: 0 – 4,194,000)Device instance = offset + MACWrite
AV48Duct Air Flow based on AI-1 flow inputDuct airflow from flow inputRead
AV49Duct Air Flow based on AI-2 flow inputDuct airflow from flow inputRead
AV50Duct Air Flow based on AI-3 flow input (Supply Flow)Duct airflow from flow inputRead
AV51Duct Air Flow based on AI-4 flow input (Exhaust Flow)Duct airflow from flow inputRead
AV52Volumetric Offset (Supply Flow – Exhaust Flow)Supply minus exhaust flowRead
AV53Volumetric Offset SetpointControl setpointWrite
AV54AO-1 Override LevelOutput override levelWrite
AV55AO-2 Override LevelOutput override levelWrite
AV56AO-3 Override LevelOutput override levelWrite
AV57AO-4 Override LevelOutput override levelWrite
AV58AI-1 Deadband SettingControl deadbandWrite
AV59AI-2 Deadband SettingControl deadbandWrite
AV60AI-3 Deadband SettingControl deadbandWrite
AV61AI-4 Deadband SettingControl deadbandWrite
AV62TI-1 Deadband SettingControl deadbandWrite
AV63TI-2 Deadband SettingControl deadbandWrite
MOmin1Primary solation ModeRoom isolation modeWrite1=positive, 2=negative, 3=neutral
MO2Secondary Isolation ModeRoom isolation modeWrite1=positive, 2=negative, 3=neutral
MOmin3Primary Alarm StatusAlarm statusRead1=normal, 2=warning, 3=alarm
MO4Secondary Alarm StatusAlarm statusRead1=normal, 2=warning, 3=alarm
MO5AI-3 Alarm StatusAlarm statusRead1=normal, 2=warning, 3=alarm
MO6AI-4 Alarm StatusAlarm statusRead1=normal, 2=warning, 3=alarm
MO7TI-1 Alarm StatusAlarm statusRead1=normal, 2=warning, 3=alarm
MO8TI-2 Alarm StatusAlarm statusRead1=normal, 2=warning, 3=alarm
MO9Offset Control StatusVolumetric offset control statusRead
Object ID lookup: Johnson Controls FMS-1655 Room Pressure Controller point IDs by name

Integration notes

Check it against the live device. A points list tells you what the controller can expose; the unit in front of you may differ by firmware or installed options. This list is provided as-is for reference only and may contain mistakes — confirming it before you write, map or commission anything is up to you (terms). Easy BACnet scans a network for BACnet IP devices from an Android phone, reads every object on the Triatek FMS-1655 Room Pressure Controller (BACnet MS/TP) and exports what it actually has to Excel — free. New to BACnet? Start with what a BACnet points list is and what the object types mean.

Questions about the Johnson Controls Triatek FMS-1655 Room Pressure Controller (BACnet MS/TP)

How many BACnet points does the Johnson Controls Triatek FMS-1655 Room Pressure Controller (BACnet MS/TP) have?

This list has 90 BACnet objects: 6 analog inputs, 4 analog outputs, 63 analog values, 4 binary inputs, 4 binary outputs, 9 multi-state outputs. The exact set on a given unit depends on its firmware, installed options and configuration.

Which Johnson Controls Triatek FMS-1655 Room Pressure Controller (BACnet MS/TP) BACnet points are writable?

60 of the 90 objects accept a write. Points marked Command have a priority array: a write holds until it is released, so release it back to automatic when you are done.

Where is the official Johnson Controls Triatek FMS-1655 Room Pressure Controller (BACnet MS/TP) BACnet documentation?

The source is FMS-1655 Room Pressure Controller Programming Manual (LIT-12013120 Rev. A), revision 2018-08, published free by Johnson Controls at https://docs.johnsoncontrols.com/bas/api/khub/documents/JIDP3G795sTe0t6ZnGsF2g/content.

What are the minimum BACnet points to integrate the Johnson Controls Triatek FMS-1655 Room Pressure Controller (BACnet MS/TP)?

Start with MO 1 Primary solation Mode (Isolation mode: 1 positive, 2 negative, 3 neutral); AV 1 AI-1 Setpoint (Room Pressure) (Room pressure setpoint); AI 1 Analog Input 1 (default: Isolation Pressure) (Room (isolation) pressure); AO 1 Analog Output 1 (default: Damper Position) (Damper position output); BI 1 Digital Input 1 (default: Door Switch) (Door switch); MO 3 Primary Alarm Status (Primary alarm: 1 normal, 2 warning, 3 alarm).

How do I enable BMS control of the Johnson Controls Triatek FMS-1655 Room Pressure Controller (BACnet MS/TP)?

Primary Isolation Mode (MSO 1) is writable: 1 positive, 2 negative, 3 neutral.

Can the BMS supply sensor values to the Johnson Controls Triatek FMS-1655 Room Pressure Controller (BACnet MS/TP)?

AV 43-46 are writable network variables for humidity, temperature, air changes and differential pressure sent from the BAS.

How do I check these points on the real Triatek FMS-1655 Room Pressure Controller (BACnet MS/TP)?

Scan the network with a BACnet IP browser such as Easy BACnet, open the device and compare its object list with this table. Anything missing is usually an option that isn't installed or a point that is disabled in the controller's configuration.

More Johnson Controls BACnet points lists

Source: FMS-1655 Room Pressure Controller Programming Manual · LIT-12013120 Rev. A · rev. 2018-08. Object names, instances and units are reproduced as published; descriptions are our own.