Qualitrol 118 ITM Series Instruction Manual page 35

Appendix G Modbus Communications
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If No Parity has been selected, the number of stop bits can be set to 1 or 2 (S1 or
S2). S1 is used if the unit is communicating through a modem; otherwise, S2 is the
standard.
4. When the desired Protocol is displayed, press the MAX TEMP RESET (Middle)
button. This will show the current Address setting.
Pressing the ALARM (Top) button will step the display UP through the addresses.
Pushing the FANS (bottom) button will step the display DOWN through the
addresses.
Note: Legal addresses in Modbus mode are 1–255.
Pressing the MAX TEMP RESET (top) button will return the unit to normal operation
and save the settings.
If no button is pushed for 30 seconds, the unit will automatically return to normal
operation with the communications setup unchanged.
Modbus
Register Data Returned When Register Is Addressed
40001 Temperature Left Phase
40002 Temperature Center Phase
40003 Temperature Right Phase
40004 ITM Status
40005 Maximum Stored Temperature
40006 Phase with Max Stored Temperature
NOTE: There will always be only a
single "1" in bits 1, 2, or 3
40007 Temperature at Unit's Terminal Block
40008 Diagnostic Status
Courtesy of NationalSwitchgear.com
Normal temperature range is 0 - 255D in low byte
A value of 8000H indicates invalid data
Bit 0 "1" = Some other bit is '1'
Bit 1 "1" = ON, Fan State
Bit 2 "1" = ON, Alarm State
Bit 3 "1" = ON, Trip State
Bit 4 "1" = ON, Buzzer State
Bit 5 "1" = ON, Manual Fan State
Bit 6 "1" = ON, Aux Relay 4 State
Bit 7 "1" = ON, Aux Relay 5 State
Normal temperature range is 0 - 255D in low byte
Bit 0 Always a "1"
Bit 1 A "1" indicates max stored temp was left phase
Bit 2 A "1" indicates max stored temp was center phase
Bit 3 A "1" indicates max stored temp was right phase
The low byte indicates the temperature at the
instrument terminal block in degrees C.
Temperatures below zero will show as zero
Bit 0 "1" = Some other bit is '1'
Bit 1 "1" = Failed A/D Converter
Bit 2 "1" = Failed Terminal Block Temperature Sensor
Bit 3 "1" = Failed EEROM
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