E
3
Point Gas Monitor Technical Manual 39
Annex A - BACnet and Modbus Objects on E3Point Network
Annex A - BACnet and Modbus Objects
on E
3
Point Network
The E
3
Point Network can be factory configured with optional
communication types: BACnet or Modbus. Each of these communication
protocols has its own specific objects.
Honeywell recommends that appropriate measures be taken to ensure
security since BACnet and Modbus are not inherently secure. The installer
takes all responsibility for protecting the controller from malicious network
traffic.
BACnet Configuration
The E3Point is an MSTP Master Device and supports Dynamic Device
Binding (WHOIS/IAM), which is part of BACnet protocols DM-DDB-B
and DM-DOB-B (see the Protocol Implementation Conformance
Statement section for details).
BACnet Objects Descriptions
Each measurement type has Analog Input (AI), Analog Value (AV), Binary
Output (BO) and Binary Value (BV) objects. The table below defines each
object and lists the default setting:
Type Name Description
Read/
Write
AI Conc. The gas reading R
AV Alr A The level at which Alarm A will be triggered R/W
AV Hyst A Alarm A hysteresis offset (Alr A + Hyst A = level at
which alarm is deactivated)
R/W
AV Alr B The level at which Alarm B is triggered R/W
AV Hyst B
Alarm B hysteresis offset (Alr B + Hyst B = level at
which alarm is deactivated)
R/W
BV Hi
Temp
Fault
Temperature High Level limit R
BO Relay Actual buzzer status (on or off) R/W
BO Buzzer Actual relay status (on or off) R/W
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