Electronic Temperature Monitor
ECN-27644 21 July 7, 2010
If No Parity has been selected then 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 Stop Bit is displayed, press the MANUAL FAN (top) button,
this will show the Protocol setting:
nb for Modbus protocol
232 for RS-232 communications (setup protocol)
5. When the desired Protocol is displayed, press the MANUAL FAN (top) button,
this will show the current Address setting.
Pressing the AUDIBLE (middle) button will step the display up thru the
addresses.
Pushing the MAX MEMORY (bottom) button will step the display down thru
the addresses.
Note: Legal addresses in ModBus mode are 1-255.
Pressing the MANUAL FAN (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
Reg. No.
Data Returned when Register
Is addressed
Comments
40001
40002
40003
Temperature Left Phase
Temperature Center Phase
Temperature Right Phase
Normal temp range is 0-255d in lo byte
A value of 8000h indicates invalid data
40004 ETM STATUS
bit 0
bit 1
bit 2
bit 3
bit 4
bit 5
“1” = some other bit is “1”
“1” = ON, Fan State
“1” = ON, Alarm State
“1” = ON, Trip State
“1” = ON, Buzzer State
“1” = ON, Manual Fan State
40005 Maximum Stored Temperature normal temp. range is 0-255d in lo byte
40006
Phase with Max Stored Temperature
bit 0
NOTE: there will always be a bit 1
single “1” in bits 1, 2 or 3 bit 2
bit 3
always a “1”
a “1” indicates max. stored temp. was left phase
a “1” indicates max. stored temp. was center phase
a “1” indicates max. stored temp. was right phase
40007
Temperature at Unit’s terminal block The lo byte indicates temperature at the instrument
terminal block in degrees C. Temperatures below
zero will show as zero.
Courtesy of NationalSwitchgear.com
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