HRW Limited
Unit E, 11/F, Sun Ying Industrial Centre
Ph +852 2546 7402
9 Tin Wan Close, Tin Wan
Fax +852 2546 7403
Hong Kong
www.hrw.hk
HPE8884BN Network I/O Expansion Unit, BACnet MS/TP
FW4.02
28 point network point expansion unit for BACnet MS/TP networks. The large I/O count enables remote
monitoring and control of numerous points at a similar location by one of more master controllers over
the BACnet network.
Universal inputs may be locally scaled and tagged according to engineering units, calibrated and/or
filtered to adjust for cabling or sensor characteristics. Digital inputs and UI’s may be configured as pulse
counters. Digital outputs may have short-cycle timers set.
Typical Applications
Digital/analogue inputs such as alarms, operation statuses, high/low level, water & air flow
proving, environmental conditions such as temperature, humidity or pressure, and other
auxiliary contacts.
Digital/analogue outputs for switching of fans, pumps, lighting or remote status indication, and
modulating control of actuators, speed or load controllers and remote analogue gauges.
Universal inputs and digital inputs may be used as counting inputs for metering of energy and
volume and instantaneous load calculation at the Master controller
Feature Summary
8 Digital Inputs (DI n/o or n/c, flip/flop, pulse-counting up to 10Hz)
8 Digital Outputs (DO) with power-up presetting & short-cycle timers
8 Universal Inputs (UI - user configurable analogue [AI] or digital [DI n/o or n/c], flip/flop, pulse-
counting up to 10Hz)
4 Analogue Outputs (AO) with power up presetting
RJ11 connected room sensor options (UI1 & UI2 via screw terminals or RJ11 socket)
UI’s user definable for non-standard sensors, active or passive from 1kΩ
Connected sensors may be calibrated and filtered by way of the UI configuration
Isolated, 256 node (1/8
th
load), RS485 network driver
Communication speeds from 2400 baud up to 76800 baud
System-wide unique device addressing
BACnet application services; Single-Read, Multiple-Read, Single-Write, Who Is, I Am, Who
Has, I Have
BACnet priority array
LED indication of the On/Off status of DI and DO points for fast visual status verification
Dynamic LED indication of AO status
Sequential flashing of DI LED’s as ‘Watchdog’
Automatic communication resumption after a power loss
PC configuration by text file download using FUNCPROG or by direct parameter settings entry
Upload text file data for retrieving lost application settings, for re-use in other controllers
