Install Instructions

ManualsBrandsVeris ManualsCO2 SensorsProtocol Air Quality Sensor for CO2, Humidity, & Temperature, Transmitter, BACnet MSTP/Modbus

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CW2 Protocol Series Installation Guide

Example: No Parity, 19200 Baud

1 2 3 4 5 6 7 8

o o on o o o o o

None 19200 Baud Unused

Modbus Point Map

Function Codes:

Function Code Function

03 Read holding (RW) registers

04 Read input (RO) registers

06 Write single register*

16 Write multiple registers

01 Read coils

05 Write single coil

15 Write multiple coils

* Not supported.

All of these values correspond to BACnet objects with the same name. See the BACnet Conformance Statement for their

denitions.

Note that an attempt to write to “read only” holding registers will give an error and the entire write command will not be

executed even if writing to read/write locations were also requested. Exception code 2 is given in this case. “Preserved” means

the values is maintained through power outages.

32-Bit Input Registers (Read Only):

1 Temperature reading in IEEE 32-bit oating point

3 Humidity reading in IEEE 32-bit oating point

5 CO reading in IEEE 32-bit oating point

7 VOC reading in 32-bit integer

9 Model (numeric representation of ASCII characters)

42 Serial number (numeric representation of ASCII characters)

32-Bit Holding Registers (Read/Write):

1 Temperature setpoint

3 Humidity setpoint

5 Screen color set

7 Device name

40 Fan speed

Note: All holding registers are preserved during power outages.

Coils (Read/Write):

2* CO stoplight

3* Touchbutton disable

4* Invoke CO calibration

5* Temperature (°C)

6 Occupancy override

7* Touch timeout

8* Display shows humidity

9* Display shows CO level

10* Display shows VOC level

*Preserved during power outages.

Installation (cont.)