Quest Controls 600 - Appendix A - Modbus Register Map

Rev 3.1 01/11/23 - 27 - Model 600 User Guide
Appendix A – Modbus Register Map
Any register that is defined as read/write (RW) and has a Y under the Non-Volatile column will cause a system restart when written to. This is a
normal practice to ensure that any new configuration setting is saved to flash memory and then used by the system.
Function Code
Register
Description
Read/
Write
Type Default
Notes
Non-volatile
Analog Inputs
Input Register
(FC4)
0 Zone 1 Thermistor Temp RO sword N/A Integer value 327 to -327 N
1 Zone 2 Thermistor Temp RO sword N/A Integer value 327 to -327 N
2 Humidity sensor RO sword N/A Integer value 0 to 100 N
3 Outside Air Sensor RO sword N/A Integer value 327 to -327 N
100 Zone 1 Thermistor Temp (hundredths) RO sword N/A Integer value 32727 to -32727 N
101
Zone 2 Thermistor Temp (hundredths)
RO
sword
N/A
Integer value 32727 to -32727
N
102 Humidity sensor (hundredths) RO sword N/A Integer value 32727 to -32727 N
103 Outside Air Sensor (hundredths) RO sword N/A Integer value 32727 to -32727 N
200
Zone 1 Thermistor Temp
RO
float
N/A
IEEE754 Floating point (32 bits)
N
202 Zone 2 Thermistor Temp RO float N/A IEEE754 Floating point (32 bits) N
204
Humidity sensor
RO
float
N/A
IEEE754 Floating point (32 bits)
N
206 Outside Air Sensor RO float N/A IEEE754 Floating point (32 bits) N
Digital Inputs
Discrete Input
(FC2)
0 HVAC 1 Lockout RO bit N/A
0 = off and 1 = on based on Reg
1204
N
1 HVAC 2 Lockout RO bit N/A
0 = off and 1 =on based on Reg
1204
N
2 HVAC 1 Control Voltage Loss RO bit N/A 0 = off and 1 =on N
3 HVAC 2 Control Voltage Loss RO bit N/A 0 = off and 1 =on N
4 HVAC 1 Econ Status RO bit N/A 0 = off and 1 =on N