lp-548 Rev. 000 Rel. 004 Date 1.11.19
4
Part 3 - Communication Configuration
A. MODBUS/BACnet Enable
In order to enable either MODBUS or BACnet, push
dipswitch 10 into the ON position to enable BAC,
and the OFF position to enable MODBUS. See the
dipswitch matrix below for a detailed description.
Final Baud Rate
Protocol
1
2
3
4
5
6
7
8
9
10
x4
BACNET
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
x1
MODBUS
Table 2 - Dipswitch Matrix
ENTER MENU CODE
925
LCD Display:
1. On the LCD display press and hold ENTER until you see the screen at the right.
2. Use the RIGHT arrow to select a character, then use the UP and DOWN arrows to select the desired
Parameter 3 Character LED Display Setting
LCD Text Display Setting
Description
37
0
OFF
MODBUS/BACnet “DISABLED” (factory default)
37
1
AUTOMATIC
MODBUS/BACnet “AUTO” (enables automatic detection of a PC or Adapter)
37
2
ON
MODBUS/BACnet “ON”
Table 3 - MODBUS MODE Settings
Please do not leave the Installer Menu after making this selection. Continue to configure the Address, Baud Rate, and Parity settings.
B. MODBUS Address
NOTE:
MODBUS must be enabled on the appliance as outlined above for the following parameters to be viewed and changed.
The MODBUS address space is comprised of 256 addresses. These are defined as follows:
•
Address 0 is a broadcast address. The master can send data to address 0 and all followers will process the data.
•
Addresses 1 – 247 are free to be assigned to MODBUS devices on the bus. Each address can be assigned to only one MODBUS device
on the bus.
•
Addresses 248 – 256 are not available for use.
C. BACnet Address
BACnet Device Instance
The unique BACnet Device instance number will consist of three (3) parts:
Base
Number:
600000
Family:
BIC926
00000
BIC928
01000
The local address will be set by the MODBUS menu on the BIC. This address is the same as the address on the RS485 bus.
Example:
A BIC928 with the RS485 address of 65 will have a device ID of 601065. A BIC926 with the RS485 address of 31 will have a device
ID of
600031
.
NOTE:
MODBUS must be enabled on the appliance as outlined above for the following parameters to be viewed and changed.
The BACnet address space is comprised of 256 addresses. These are defined as follows:
•
Address 255 is a broadcast address. The master can send data to address 0 and all followers will process the data.
•
Addresses 0 – 127 are free to be assigned to both Master and Follower BACnet nodes. Each address can be assigned to only one
BACnet device on the bus.
•
Addresses 128 – 254 are valid only for Follower nodes.
ADDRESSING SUGGESTIONS*
•
Each device must have a unique address.
•
In order to keep track of addresses for future maintenance purposes, record all device addresses in the Installation and
Maintenance Notes section included in this manual.
*SAVE THIS DOCUMENT IN A SECURE LOCATION FOR FUTURE REFERENCE.
To set the MODBUS/BACnet adapter address in the appliance installer menu:
LCD Display:
1. When at Parameter 38, press ENTER, then use UP or DOWN to select the desired address.
2. Press ENTER to store the MODBUS Address.
3. Press the RIGHT button to advance to Parameter 39 – Baud Rate.
character value. RIGHT arrow over to the next character and repeat the selection. Once code 925 or 975 is on the screen (Installer Menu
code depends on the appliance - See appliance Installation Manual for details), press and hold ENTER on the display to enter the Installer
Menu.
3. Once in the Installer Menu, use the RIGHT or LEFT arrow to navigate to Parameter 37-MODBUS MODE. When at Parameter 37, press
ENTER, then use UP or DOWN to select the desired setting from Table 3.
4. Press ENTER to store the MODBUS Configuration. Press the RIGHT button to advance to Parameter 38 - Address.
LED Display:
1. On the LED display, press and hold TEMP and RESET simultaneously. Use the + and - arrows to show 925 on the display, then press and
hold TEMP to enter the installer menu.
2. Once in the Installer Menu, use the TEMP button to navigate to Parameter 37. When at Parameter 37, use + or - to select the desired
setting from Table 3.
3. Press the TEMP button to advance to Parameter 38 - Address.
