Chapter 17 Introduction to BACnet │CP2000
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3. Steps to setup the Pr about BACnet in CP2000
Related to BACnet function in CP2000, We have to configure 2 parts of Parameters
Part1. Setup parameters related to Communication at Pr_Group9.
Part2. Setup parameters related to System_Parameter at Pr_Group0.
Part1. Pr_Group9, Communication.
1-1. Set Pr.09-31 =1, BACnet is enabled, then the COM1_Port will be accessed by BACnet. When this
is set, the COM1_Port communication format will be changed to RTU 8, N, 1.
(Note: The HW Pins of COM1_Port are shared by RJ45 and RS-485. When BACnet is enabled,
BACnet will access the COM1_Port, that also means we can NOT have Modbus, PLC connections,
VFDSoft and VFD Explorer by COM1_Port).
1-2. Set Pr.09-50, Default = 10, BACnet’s MS/TP station number 0–127
1-3. Set Pr.09-51, Default = 38400, BACnet communication baud rate, 9600, 19200, 38400 or 76800
bps.
1-4. Set Pr.09-52 and Pr.09-53, The default setting of Device Object_Identifier is 0x000A (Pr.09-52=10,
Pr.09-53=00). Device Object_Identifier is the combination of Pr.09-52 and Pr.09-53, thus the
setting range can be 0–4194303.
For example, Pr.09-53=12(0x0C) and Pr.09-52 =3456(0x0D80), then the device Identifier’s value
=12*65536+3456 =789888(0x0C0D80).
1-5. Set Pr.09-55, Default =127, the highest allowable address for master nodes on the same MS/TP
network. CP2000 base on this setting to know the Max search range.
1-6. Set Pr.09-56, setup the BACnet password. If setup is successful, the keypad will display 8888.
Part2. Pr_Group0, System Parameter.
2-1. Set Pr.00-20 =1, That means the source of the Frequency command is from RS-485 Interface
(accessed by BACnet).
2-2. Set Pr.00-21 =2, That means the source of the Operation command is from RS-485 Interface
(accessed by BACnet).
Here is a simple example:
After setting up the 2 parts of Pr, we can enable the BACnet function in CP2000. Thus, we can access
some BACnet objects to make the CP2000 driving motor Run or Stop.
Step1. Write_Service on AV_001, Present_Value =60.0  Setup Frequency Reference Value.
Step2. Write_Service on BV_007, Present_Value =Active.  Setup Servo Power CMD.
Step3. Write_Service on BV_000, Present_Value =Active.  Setup Active CMD.
Step4. Read_Service on AV_031, Present_Value  User can know the Output frequency.
PS. In CP2000, base on different Pr setting or IO setting, we can make FreqCmd with different source of Reference Value.
Please check the usage of Keypad, Pr and IO setting for more detail information.
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