Chapter 5: Serial Communications
Page 5–23
DuRApulse GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
sTeps To seTup The gs4 parameTers for baCneT
Related to BACnet function in GS4, we have to configure two parts of the parameters.
•
Part1� Setup parameter group 9 related to Communication�
•
Part2� Setup parameter groups 3 and 4 related to Digital and Analog I/O�
Part1. Parameter Group9, Communication
1) Set P9.86 =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 8N1.
(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, Gsoft2, or GSLogic connected by COM1_Port.)
2) Set P9.87, Default =10, BACnet’s MS/TP station number 0–127.
3) Set P9.88, Default =38400, BACnet communication baud rate, 9600, 19200, 38400, or
76800bps.
4) Set P9.89 and P9.90, The default setting of Device Object_Identifier is 0x0010.
(P9.89 =10, P9.90 =00). Device Object_Identifier is the combination of P9.89 and P9.90, thus
the setting range can be 0–4194303.)
For example, P9.90 =12(0Ch) and P9.89 =3456(0D80h), then the device Identifier’s value
=12*65536+3456 =789888(0C0D80h).
5) Set P9.91, Default =127, the highest allowable address for master nodes on the same MS/TP
network. GS4 uses this setting to establish the Max search range.
6) Set P9.92, setup the BACnet password. If setup is successful, the keypad will display 8888.
Part2. Parameter_Group 3 and 4, Digital and Analog I/O Parameters.
1) Set P4.00 =1 (RS-485). That means the source of the Frequency command is from RS-485
Interface (accessed by BACnet).
2) Set P3.00 = 3 or 4. That means the source of the Operation command is from RS-485
Interface (accessed by BACnet).
• Selecting 3 keeps the Stop button on the keypad active (preferred setting).
• Selecting 4 disables the keypad’s Stop button.
Example:
After setting up the two parts of the parameters, we can enable the BACnet function in GS4. Then, we
can access some BACnet objects to make the GS4 Run or Stop.
Step1: Write_Service on AV_001, Present_Value =60 → Setup Frequency Reference Value.
Step2: Write_Service on BV_007, Present_Value =Active → Setup Drive PowerOn.
Step3: Write_Service on BV_000, Present_Value =Active → Setup Active CMD.
Step4: Read_Service on AV_031, Present_Value → Read the Output frequency.
Keypad Setting
Other Setting
AV_001 FreqRefValue
P4.00 = 1
0
ACTIVE CMD
BV_000 = 1
BV_000 = 0
FreqCmd
As shown in the diagram above, the GS4 can get its Frequency Command from a variety of sources. A
typical configuration is to set P4.00 REMOTE Frequency Source = 1 (RS-485/BACnet), and to set P4.01
LOCAL Frequency Source = 0 (Keypad). This way, when the REMOTE button is pressed on the drive’s
keypad, the drive will be commanded by BACnet. If you experience network problems (or need to
spin the motor during commissioning), you can press the LOCAL button on the keypad and control the
drive from the keypad.
(See parameters P3.00, P3.01, P4.00, and P4.01 for more details.)
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