Key Specification

 
   
PILOT  Point Expansion unit,  type HPE - BNMOD,  is for integration of Modbus RTU slave devices in to BACnet MS/TP networks. Multiple Modbus RTU devices of any mix may be connected to the HPE-BNMOD for read/write access of up to 250 data-points.
 
All points may be individually scaled and multiple points representing Modbus registers which use multiple Words may be combined so that only one Object Instance representing the scaled multiple Word register value needs to be read up by the BMS.

Application Data 

Primary network protocol:BACnet MS/TP
Sub-network protocol: Modbus RTU 

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Administration points:
Point 1- Diagnostic counter reset

Point 2- BACnet comms error count
 
Point 3- Modbus comms error count
 
Point 1000- BACnet node
 
Point 1001- BACnet baud rate

 Point 1002- Modbus baud rate / config.

DI- BACnet global Device Instance
 
MM- Max Master

SV- System Vendor ID 

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Modbus RTU data points:250 total, point 4...253 

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Supported Modbus RTU functions:
01- Read (write) Coil status 

02- Read Discrete Input

03- Read (write) Holding Register

04- Read Input Register 

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Comm speed selection, BACnet MS/TP:2400, 4800, 9600 (default), 19200, 38400, 76800

Comm speed selection, Modbus subnet:2400, 4800, 9600 (default), 19200

Modbus subnet comm configuration:7/8 data bits ¨C Odd/Even/No parity ¨C 1/2 stop bits
(default ¨C 8N1)