EZT-550 Controller Manual
59
9.3 EZT-550 Operands
CAUTION
Adhere to the following table of operands and their allowable data ranges. Do not
exceed the ranges or attempt to write to any other operand number than those listed
below. Failure to do so can result in controller failure and or damage to equipment.
Operand #
Description
Data Range
0000
Alarm Acknowledge/Silence
Used to acknowledge a chamber alarm
remotely and silence audible alarm.
Write Only
2 = Acknowledge
0002
Chamber Events
Used to turn chamber systems on and off.
Read/Write (set bit on to turn on event)
Bit 0 = Chamber On/off
Bit 1 = Humidity System On/off
Bit 2 = Auxiliary Cooling On/Off
Bit 3 = Dry Air Purge On/Off
Note:
When setting events, each bit must be
set every time the operand is written to in order
to keep the event on.
Example:
Turn on chamber and humidity system:
Set bits 0 & 1 = decimal 3
Turn off humidity system only:
Set bit 0 on only = decimal 1
0003
Customer Events
Used to turn optional customer event relays
on and off.
Read/Write (set bit on to turn on event)
Bit 0 = Customer Event 1
Bit 1 = Customer Event 2
Bit 2 = Customer Event 3
Bit 3 = Customer Event 4
Bit 4 = Customer Event 5
Bit 5 = Customer Event 6
Bit 6 = Customer Event 7
Bit 7 = Customer Event 8
Bit 8 = Customer Event 9
Bit 9 = Customer Event 10
Bit 10 = Customer Event 11
Bit 11 = Customer Event 12
0004
Air Temperature Setpoint
Used to set single setpoint temperature.
Read/Write
Range = 0 to 100% relative humidity
Note:
The setpoint must be in whole numbers.
The decimal point is implied as the first digit in
the data value.
Example:
Setpoint of 50.0% = 500 sent to operand
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