SyxthSense Ltd
Copyright © 2020 SyxthSense Ltd. All rights reserved - 11/2020
PS
CT2.161
- 22/34
Online store:
www.syxthsense.com
Enquiries: T:
+44 (0)1392 875 414
E:
Parameter Storage
The configuration parameters are stored in the non-volatile memory. When the changes are carried
out via the display, the parameters are stored in the non-volatile memory when the controller returns
to a normal display mode. If the changes are carried out over the network (Modbus or BACnet), then
"NonVol Update" register/object is required to be forced on to save the changes. The register will
automatically return to normal state
Modbus Registers
The controller supports the following Modbus registers and function codes. The default
communication speed is 9600 bps, 8 data bits, Parity None and 1 Stop Bit. The default Modbus Slave
address is 1. The device Parity can be changed between Odd, None and Even. The baud rate is
selectable between 9600, 19200, 38400, 57600 and 76800 bps. The table shows the register offsets
starting from 0 (0 Base) register address. For example, the Temperature is read from Modbus register
0 using Function Code 04. Some Modbus masters will require one to be added to Modbus registers
(i.e. 1 Base). In this case Function Code 04, register 101 needs to be entered.
Reload Default
Reload Default Settings
0 = Off (default)
1 = On
Version
Software Version
x.xx (BACnet/Modbus)
SYSTEM
Parameter Name
Description
Range
Register
Parameter Description
Data Type
Raw Data
Range
FUNCTION CODE 01 - READ COILS
FUNCTION CODE 05 - WRITE SINGLE COIL
FUNCTION CODE 15 - WRITE MULTIPLE COILS
100
OFF Mode Override
0..1
Off - On
101
ECO Mode Override
0..1
Off - On
102
Heating/Cooling Mode (change-over mode)
0..1
0 = Heating, 1 = Cooling
FUNCTION CODE 02 - READ DISCRETE INPUTS (Add 10,000 for Modicon Addressing)
100
Digital Input Status (DI1)
0..1
Off - On
101
Boost Status
0..1
Off - On
102
Screen Lock Status
0..1
Off - On
103
Digital Output 1 (SRC-702)
0..1
Off - On
104
Digital Output 2 (SRC-702)
0..1
Off - On
FUNCTION CODE 04 - READ INPUT REGISTERS (Add 30,000 for Modicon Addressing)
100
Built-In Temperature Measurement
Signed 16
-400...3020
-40.0...150.0°C
(-40.0..302.0°F)
101
Remote Sensor 1 Measurement (Resistive
Input 1)
Signed 16
-400...3020
-40.0...150.0°C
(-40.0..302.0°F)
102
Remote Sensor 2 Measurement (Resistive
Input 2)
Signed 16
-400...3020
-40.0...150.0°C
(-40.0..302.0°F)
103
Current Calculated Setpoint
Signed 16
-400...3020
-40.0...150.0°C
(-40.0..302.0°F)
104
Device Current Mode
Unsigned 16
0..3
0 = Comfort
1 = ECO
2 = OFF
3 = Boost
105
Relative Humidity Measurement
Unsigned 16
0..1000
0..100.0 %rH
106
CO2 Measurement
Unsigned 16
0..5000
0..5,000 ppm
107
Analogue Output Y1
Unsigned 16
0..1000
0..100.0 %
108
Analogue Output Y2
Unsigned 16
0..1000
0..100.0 %
109
Analogue Output Y3
Unsigned 16
0..1000
0..100.0 %
110
Alarm 1 State
Unsigned 16
0..3
0 = Normal (No Alarm)
1 = Amber Alarm
2 = Red Alarm
111
Alarm 2 State
Unsigned 16
0..3
0 = Normal (No Alarm)
1 = Amber Alarm
2 = Red Alarm
114
Analogue Input 1 (RI1) Measurement (0-10V,
Option)
Unsigned 16
0..1000
0..100.0 %
115
Analogue Input 2 (RI2) Measurement (0-10V,
Option)
Unsigned 16
0..1000
0..100.0 %
