22
Communications
All standard control systems have Modbus RTU. The Premium control option includes Modbus RTU and TCP/IP
and is available with options for BACnet, LonWorks, or OPC/UA communications. The Modbus RTU default set up
uses a Baud Rate: 57,600, Data Length: 8 bits, Parity: Odd, Stop Bit: 1 and Station ID: 1. The default IP address of
Modbus TCP/IP is 192.168.1.1. This address is adjustable in the User Setup screens.
Table 8 – Modbus Table
Types
Index
Size Variable Name
Data Type
Coil 0
1
HMI_START
Bool
Coil 1
1
SYSTEM_RUNNING
Bool
Coil 2
1
HMI_STOP
Bool
Coil 3
1
SYSTEM_STOPPING
Bool
Coil 4
1
COMPRESSORS_RUNNING
Bool
Coil 10
1
PHASE_OK
Bool
Coil 11
1
EVAP_FLOW_SWITCH_OK
Bool
Coil 12
1
LPS_OK
Bool
Coil 13
1
LLPS_OK
Bool
Coil 14
1
RFRG_HIGH_PRESSURE_OK
Bool
Coil 15
1
COND_FAN1_EXISTS
Bool
Coil 16
1
COND_FAN1_OVLD_OK
Bool
Coil 17
1
ENABLE_FAN_FS1
Bool
Coil 18
1
COND_FAN2_EXISTS
Bool
Coil 19
1
COND_FAN2_OVLD_OK
Bool
Coil 20
1
ENABLE_FAN_FS2
Bool
Coil 21
1
COND_FAN3_EXISTS
Bool
Coil 22
1
COND_FAN3_OVLD_OK
Bool
Coil 23
1
ENABLE_FAN_FS3
Bool
Coil 25
1
PULSE_2SEC
Bool
Coil 26
1
SYSTEM_NOT_RUNNING
Bool
Coil 30
1
COMP1_EXISTS
Bool
Coil 31
1
COMP1_OVLD_INTERNAL Bool
Coil 32
1
COMPRESSOR_1_DISABLED
Bool
Coil 33
1
COMP1_REQUEST
Bool
Coil 34
1
COMP1_STATUS_OK
Bool
Coil 35
1
COMP1_OK
Bool
Coil 36
1
COMP1_ANTICYCLE_TIMER_DONE
Bool
Coil 37
1
COMP1_ENABLE
Bool
Coil 40
1
COMP2_EXISTS
Bool
Coil 41
1
COMP2_OVLD_INTERNAL Bool
Coil 42
1
COMPRESSOR_2_DISABLED
Bool
Coil 43
1
COMP2_REQUEST
Bool
Coil 44
1
COMP2_STATUS_OK
Bool
Coil 45
1
COMP2_OK
Bool
Coil 46
1
COMP2_ANTICYCLE_TIMER_DONE
Bool
Coil 47
1
COMP2_ENABLE
Bool
Coil 56
1
AL_ALARMS_PRESENT
Bool
Coil 57
1
AL_GENERAL_ALARMS
Bool
Coil 58
1
AL_RFRG_ALARM
Bool
Coil 59
1
AL_CRITICAL_ALARM
Bool
Coil 60
1
AL_PHASE_LOSS.Active
Bool
Coil 61
1
AL_PROCESS_PUMP_OVLD.Active Bool
Coil 62
1
AL_RECIRC_PUMP_OVLD.Active
Bool
Coil 63
1
AL_TANK_LOW_LEVEL.Active
Bool
Coil 64
1
AL_FREEZESTAT.Active
Bool
Coil 65
1
AL_EVAP_FLOW.Active
Bool