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Water treatment controller (pool chemistry) · BACnet points list

Contemporary Controls BECS BECsys5 / BECsys7 / BECsysBW water chemistry controller via BASgatewayLX BACnet points list

Updated 12 November 2026

Short answer

Gateway profile for BECsys controllers: 190 objects (34 AI, 55 AO, 101 BI), all polled. Inputs give product data, clock, general and flow alarms, pH, ORP, free/total/combined chlorine, flow, conductivity/TDS and temperature readings with their feed relay states and high/low/limit alarms, plus inventory levels; outputs set pH, ORP and chlorine set points, spans, alarm points and the SuperChlor, booster and heater set points.

This page lists 190 BACnet objects for the Contemporary Controls BECS BECsys5 / BECsys7 / BECsysBW water chemistry controller via BASgatewayLX — 55 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Contemporary Controls’s own free documentation, linked below.

Manufacturer
Contemporary Controls
Model
BECS BECsys5 / BECsys7 / BECsysBW water chemistry controller via BASgatewayLX
Equipment
Water treatment controller (pool chemistry)
Equipment type
Other equipment
BACnet objects
190 (55 writable)
Transport
BACnet IP
Firmware
Not stated
Also known as
BECsys5, BECsys7, BECsysBW, BECS Technology, BECsys Modbus
Source document
BASgatewayLX Modbus device profile BECSys_a · BECSys_a_LX.csv
Download CSV 190 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 Contemporary Controls’s current documentation and the live device before use. Not official Contemporary Controls information. Terms of use.

BMS integration notes: Contemporary Controls BECS BECsys5 / BECsys7 / BECsysBW water chemistry controller via BASgatewayLX

Integration in brief

Map the pH and ORP set points and readings first, then free chlorine, flow and the general alarm. Outputs in this profile change stored values or settings, so write them only on purpose.

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
AO 19pH set pointpH set pointCommand
AO 35ORP set pointORP set pointCommand
AI 14pH ReadingpH readingRead
AI 25ORP readingORP readingRead
AI 30Free Cl readingFree chlorine readingRead
AI 57Flow Rate readingFlow rateRead
BI 11Sample Stream FlowSample stream flowRead
BI 9General AlarmGeneral alarmRead

Network setup

Watch out for

Contemporary Controls BECS BECsys5 / BECsys7 / BECsysBW water chemistry controller via BASgatewayLX 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.

Note: the source document has no read/write column, so access here is inferred from the object type (inputs read-only, values writable). Confirm on the live controller before writing.

190 of 190 shown
Type
Binary
Access
Show
Contemporary Controls BECS BECsys5 / BECsys7 / BECsysBW water chemistry controller via BASgatewayLX BACnet Points List
DescriptionStates
AI17 digit product numberModbus 400002Read
AI26 digit serial numberModbus 400004Read
AI3Firmware VersionModbus 400006Read
AI4System DateModbus 400007daysRead
AI5System TimeModbus 400008minRead
AI6System Reset DateModbus 400009daysRead
AI7System Reset TimeModbus 400010minRead
BI8Low BatteryModbus 113089Read
BImin9General AlarmModbus 112290Read
BI10Alarm RelayModbus 112557Read
BImin11Sample Stream FlowModbus 112289Read
BI12No Flow (Sample Stream) AlarmModbus 113067Read
BI13Flow restored delaying feedsModbus 113094Read
AImin14pH ReadingModbus 408193Read
AI15pH High Alarm PointModbus 408961Read
AI16pH Low Alarm PointModbus 408975Read
BI17pH High AlarmModbus 113073Read
BI18pH Low AlarmModbus 113074Read
AOmin19pH set pointModbus 408705Command
AO20pH Proportional SpanModbus 409217Command
BI21pH Feed Down Relay stateModbus 112545Read
BI22pH Feed Up Relay stateModbus 112546Read
BI23pH feed down limit alarmModbus 113057Read
BI24pH feed up limit alarmModbus 113096Read
AImin25ORP readingModbus 408194mVRead
AO26ORP High Alarm PointModbus 408962mVCommand
AO27ORP Low Alarm PointModbus 408976mVCommand
BI28ORP High alarmModbus 113075Read
BI29ORP Low alarmModbus 113076Read
AImin30Free Cl readingModbus 408197ppmRead
AO31Free Cl High Alarm PointModbus 408965ppmCommand
AO32Free Cl Low Alarm PointModbus 408979ppmCommand
BI33Free Cl High alarmModbus 113077Read
BI34Free Cl Low alarmModbus 113078Read
AOmin35ORP set pointModbus 408706mVCommand
AO36ORP Proportional SpanModbus 409218mVCommand
AO37Alternate ORP set pointModbus 408707mVCommand
AO38Bracketed ORP High set pointModbus 408727mVCommand
AO39Bracketed ORP Low set pointModbus 408728mVCommand
AO40Free Cl set pointModbus 408710ppmCommand
AO41Free Cl Proportional SpanModbus 409219ppmCommand
AO42Alternate Free Cl set pointModbus 408711ppmCommand
AO43Bracketed Free Cl High set pointModbus 408729ppmCommand
AO44Bracketed Free Cl Low set pointModbus 408730ppmCommand
BI45Cl Feed Relay stateModbus 112547Read
BI46Cl limit alarmModbus 113058Read
AI47Total Cl readingModbus 408206ppmRead
AO48Total Cl High Alarm PointModbus 408973ppmCommand
AO49Total Cl Low Alarm PointModbus 408988ppmCommand
BI50Total Cl High alarmModbus 113116Read
BI51Total Cl Low alarmModbus 113117Read
AI52Combined Cl readingModbus 408211ppmRead
AO53Combined Cl High Alarm PointModbus 408966ppmCommand
BI54Combined Cl High alarmModbus 113118Read
AO55UV Combined Cl set pointModbus 408726ppmCommand
BI56UV Turndown Relay stateModbus 112583Read
AImin57Flow Rate readingModbus 408208Read
AO58Flow Rate Low Alarm PointModbus 408991Command
BI59Low Flow alarmModbus 113093Read
BI60Recirculation Relay stateModbus 112549Read
AI61VFD % outputModbus 408449%Read
BI62VFD Out of Range alarmModbus 113107Read
AO63SuperChlor ORP set pointModbus 408720mVCommand
AO64SuperChlor Free Cl set pointModbus 408721ppmCommand
BI65SuperChlor Relay stateModbus 112554Read
BI66SuperChlor TimeoutModbus 113091Read
AI67DeChlor ORP set pointModbus 408722mVRead
AI68DeChlor Free Cl set pointModbus 408723ppmRead
BI69DeChlor Relay stateModbus 112555Read
BI70DeChlor limit alarmModbus 113104Read
AO71Cl Booster ORP Trigger set pointModbus 408714mVCommand
AO72Cl Booster ORP set pointModbus 408716mVCommand
AO73Cl Booster Free Cl Trigger set pntModbus 408715ppmCommand
AO74Cl Booster Free Cl set pointModbus 408717ppmCommand
BI75Cl Booster Relay stateModbus 112548Read
BI76Cl Booster limit alarmModbus 113112Read
AO77Ozone ORP set pointModbus 408718Command
AO78Ozone Free Cl set pointModbus 408719Command
BI79Ozone limit alarmModbus 113113Read
BI80Ozone Relay stateModbus 112556Read
AI81Conductivity readingModbus 408195Read
BI82Conductivity High alarmModbus 113079Read
BI83Conductivity Low alarmModbus 113080Read
AO84Conductivity High Alarm PointModbus 408963Command
AO85Conductivity Low Alarm PointModbus 408977Command
AI86TDS set pointModbus 408731ppmRead
BI87TDS Relay stateModbus 112582Read
BI88TDS limit alarmModbus 113097Read
AI89Temperature readingModbus 408196Read
AO90Temperature High Alarm PointModbus 408964Command
AO91Temperature Low Alarm PointModbus 408978Command
BI92Temperature High alarmModbus 113081Read
BI93Temperature Low alarmModbus 113082Read
AO94Heater set pointModbus 408708Command
AO95Alternate Heater set pointModbus 408709Command
BI96Heater Relay stateModbus 112550Read
BI97Heater limit alarmModbus 113059Read
AI98pH Inventory Level readingModbus 408198Read
AO99pH Inventory Level Low Alarm PointModbus 408980Command
BI100pH Inventory Low AlarmModbus 113069Read
AI101Cl Inventory Level readingModbus 408199Read
AO102Cl Inventory Level Low Alarm PointModbus 408981Command
BI103Cl Inventory Low AlarmModbus 113070Read
AI104Turbidity readingModbus 408200Read
AO105Turbidity High Alarm PointModbus 408967Command
BI106Turbidity High alarmModbus 113068Read
AO107Polymer High set pointModbus 408712Command
AO108Polymer Low set pointModbus 408713Command
BI109Polymer Feed Relay stateModbus 112552Read
AI110Surge Pit Level readingModbus 408201Read
AO111Surge Pit High Alarm PointModbus 408968Command
AO112Surge Pit Low Alarm PointModbus 408983Command
BI113Surge Pit High alarmModbus 113071Read
BI114Surge Pit Low alarmModbus 113072Read
BI115Low Surge Pit EMERG OFFModbus 113065Read
AI116Autofill set pointModbus 408724Read
AI117Alternate Autofill set pointModbus 408725Read
BI118Autofill Relay stateModbus 112581Read
BI119Autofill limit alarmModbus 113092Read
AI120Filter Influent Pressure readingModbus 408203Read
AO121Filter Influent Pressure High Alarm PointModbus 408970Command
AO122Filter Influent Pressure Low Alarm PointModbus 408985Command
BI123Filter Influent Pressure High alarmModbus 113083Read
BI124Filter Influent Pressure Low alarmModbus 113084Read
AI125Filter Effluent Pressure readingModbus 408204Read
AO126Filter Effluent Pressure High Alarm PointModbus 408971Command
AO127Filter Effluent Pressure Low Alarm PointModbus 408986Command
BI128Filter Effluent Pressure High alarmModbus 113085Read
BI129Filter Effluent Pressure Low alarmModbus 113086Read
AI130Filter Differential Pressure readingModbus 408209Read
AO131Filter Differential Pressure High Alarm PointModbus 408990Command
BI132Filter Diff High alarmModbus 113087Read
AI133Strainer Out Vacuum readingModbus 408205Read
AO134Strainer Vacuum High Warning PointModbus 408972Command
AO135Strainer Vacuum High Alarm PointModbus 408987Command
BI136Strainer Vacuum High WarningModbus 113114Read
BI137Strainer Vacuum High AlarmModbus 113088Read
BI138High Strainer Vacuum EMERG OFFModbus 113067Read
AI139Pump Effluent pressure readingModbus 408207Read
AO140Pump Effluent Pressure High Alarm PointModbus 408974Command
AO141Pump Effluent Pressure Low Alarm PointModbus 408989Command
BI142Pump Effluent Pressure High alarmModbus 113119Read
BI143Pump Effluent Pressure Low alarmModbus 113120Read
AI144Total Dynamic Head readingModbus 408210Read
AO145Total Dynamic Head High Alarm PointModbus 408992Command
AO146Total Dynamic Head Low Alarm PointModbus 408993Command
BI147High Total Dynamic Head AlarmModbus 113105Read
BI148Low Total Dynamic Head AlarmModbus 113106Read
BI149BW isolate Relay stateModbus 112558Read
BI150BW Filter 1 Relay stateModbus 112559Read
BI151BW Filter 2 Relay stateModbus 112560Read
BI152BW Filter 3 Relay stateModbus 112561Read
BI153BW Filter 4 Relay stateModbus 112562Read
BI154BW Filter 5 Relay stateModbus 112563Read
BI155BW Filter 6 Relay stateModbus 112564Read
BI156BW Filter 7 Relay stateModbus 112565Read
BI157BW Filter 8 Relay stateModbus 112566Read
BI158BW Filter 9 Relay stateModbus 112567Read
BI159BW Filter 10 Relay stateModbus 112568Read
BI160BW Filter 11 Relay stateModbus 112569Read
BI161BW Filter 12 Relay stateModbus 112570Read
BI162BW Filter 13 Relay stateModbus 112571Read
BI163BW Filter 14 Relay stateModbus 112572Read
BI164BW Filter 15 Relay stateModbus 112573Read
BI165BW Filter 16 Relay stateModbus 112574Read
BI166BW Pri Valve Relay stateModbus 112575Read
BI167BW Turbidity Valve Relay stateModbus 112576Read
BI168BW 2nd isolate Relay stateModbus 112577Read
BI169BW 3rd isolate Relay stateModbus 112578Read
BI170BW 4th isolate Relay stateModbus 112579Read
BI171Backwash Accessory Relay stateModbus 112580Read
BI172Low Valve Pressure EMERG OFFModbus 113102Read
BI173Low Valve PressureModbus 113103Read
BI174BW Freq limit alarmModbus 113060Read
BI175Backwash alarm: Dur limit alarmModbus 113062Read
BI176Backwash alarm: Valve limit alarmModbus 113063Read
BI177BW Valve limit alarm EMERG OFFModbus 113064Read
AI178Backwash Pit Level readingModbus 408202Read
AO179Backwash Pit High Alarm PointModbus 408969Command
AO180Backwash Pit Low Alarm PointModbus 408984Command
BI181High BW Pit alarmModbus 113090Read
BI182BW Pit limit alarmModbus 113098Read
BI183Enzyme Relay stateModbus 112551Read
BI184Sensor Wash Relay stateModbus 112553Read
BI185Backwash Master Comm TimeoutModbus 113108Read
BI186Backwashing Slave Comm TimeoutModbus 113109Read
BI187Linked BECSys5/BW Comm TimoutModbus 113111Read
BI188Relay Exp 1 Comm TimeoutModbus 113099Read
BI189Relay Exp 2 Comm TimeoutModbus 113100Read
BI190Relay Exp 3 Comm TimeoutModbus 113101Read
Object ID lookup: Contemporary Controls BASgatewayLX BECsys 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 BECS BECsys5 / BECsys7 / BECsysBW water chemistry controller via BASgatewayLX 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 Contemporary Controls BECS BECsys5 / BECsys7 / BECsysBW water chemistry controller via BASgatewayLX

How many BACnet points does the Contemporary Controls BECS BECsys5 / BECsys7 / BECsysBW water chemistry controller via BASgatewayLX have?

This list has 190 BACnet objects: 34 analog inputs, 55 analog outputs, 101 binary inputs. The exact set on a given unit depends on its firmware, installed options and configuration.

Which Contemporary Controls BECS BECsys5 / BECsys7 / BECsysBW water chemistry controller via BASgatewayLX BACnet points are writable?

55 of the 190 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. The source has no read/write column, so this is inferred from object type.

Where is the official Contemporary Controls BECS BECsys5 / BECsys7 / BECsysBW water chemistry controller via BASgatewayLX BACnet documentation?

The source is BASgatewayLX Modbus device profile BECSys_a (BECSys_a_LX.csv), published free by Contemporary Controls at https://www.ccontrols.com/support/dp/BECSys_a_LX.zip.

What are the minimum BACnet points to integrate the Contemporary Controls BECS BECsys5 / BECsys7 / BECsysBW water chemistry controller via BASgatewayLX?

Start with AO 19 pH set point (pH set point); AO 35 ORP set point (ORP set point); AI 14 pH Reading (pH reading); AI 25 ORP reading (ORP reading); AI 30 Free Cl reading (Free chlorine reading); AI 57 Flow Rate reading (Flow rate); BI 11 Sample Stream Flow (Sample stream flow); BI 9 General Alarm (General alarm).

How do I check these points on the real BECS BECsys5 / BECsys7 / BECsysBW water chemistry controller via BASgatewayLX?

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 Contemporary Controls BACnet points lists

Source: BASgatewayLX Modbus device profile BECSys_a · BECSys_a_LX.csv. Object names, instances and units are reproduced as published; descriptions are our own.