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2020
EVO/
™ECM-Modbus RTU
Series 2
Page 28
Application Guide
©2020 All Rights Reserved
Evolution Controls Inc.
San Diego, CA USA
BACnet Mapping
Here is the mapping of the Modbus registers and their associated BACnet objects for the first
EVO/ECM-Modbus RTU controller in each file. The same mapping is repeated for each additional
controller.
R/W = Read and Write, R = Read Only
Modbus
BACnet Objects
Registers
Description
Analog
Input #
Analog
Output #
Analog
Value #
Binary
Input #
Binary
Output #
Coil 1
Motor 1 On/Off
1 R/W
Coil 2
Motor 2 On/Off
2 R/W
Coil 3
Motor 3 On/Off
3 R/W
Coil 4
Motor 4 On/Off
4 R/W
Coil 5
Motor 1 Alarm Status
1 R
Coil 6
Motor 2 Alarm Status
2 R
Coil 7
Motor 3 Alarm Status
3 R
Coil 8
Motor 4 Alarm Status
4 R
Coil 15
Reset Comm Time out Flag
5 R/W
Coil 16
Reset
6 R/W
Reg 2
Motor 1 Fan Output
1 R/W
Reg 3
Motor 2 Fan Output
2 R/W
Reg 4
Motor 3 Fan Output
3 R/W
Reg 5
Motor 4 Fan Output
4 R/W
Reg 6
Motor 1 RPM
1 R
Reg 7
Motor 2 RPM
2 R
Reg 8
Motor 3 RPM
3 R
Reg 9
Motor 4 RPM
4 R
Reg 10
Motor 1 Default Fan Output
13 R
Reg 11
Motor 2 Default Fan Output
14 R
Reg 12
Motor 3 Default Fan Output
15 R
Reg 13
Motor 4 Default Fan Output
16 R
Reg 14
Configuration
1 R
Reg 15
Group 1 Address
2 R
Reg 16
Group 2 Address
3 R
Reg 17
Address
4 R
Reg 18
Baud Rate
17 R
Reg 19
Motor 1 Low RPM Limit
5 R/W
Reg 20
Motor 2 Low RPM Limit
6 R/W
Reg 21
Motor 3 Low RPM Limit
7 R/W
Reg 22
Motor 4 Low RPM Limit
8 R/W
Reg 23
Motor 1 High RPM Limit
9 R/W
Reg 24
Motor 2 High RPM Limit
10 R/W
Reg 25
Motor 3 High RPM Limit
11 R/W
Reg 26
Motor 4 High RPM Limit
12 R/W
