Pacific Research Solutions PET-820 User Manual
Page 37
Pacific Research
PET-820 User Manual
Page 36
4.6.1
RESET ANALOG HIGH AND LOW VALUES
This command is used to reset the analog values in the high and low (maximum and minimum) register. Each channel can be
independently reset so not to effect other channels that may be currently recording their values. When you reset a channel, the
current analog voltage is recorded along with the time and date. Then, these registers will be updated each time a new analog
value exceeds a value currently stored in the register.
COMMAND CODE:
66
PROGRAM SYNTAX:
66 [Input] #
WHERE:
Input = 1 through 8
EXAMPLE:
66 1 # = Reset analog input #1 high and low values to current values
4.6.2
SET ANALOG HIGH AND LOW ALARM SETPOINT
Both the high and low alarm setpoints are used to define a window or group of voltages that are considered to be acceptable.
Any voltage measurement that is outside of this window will generate an alarm in the same manner as the digital switch
input alarm.
These commands are used to set up the upper and lower voltage limits that will not generate an alarm condition. Once these
limits are set for a given channel and that channel is enabled to generate an alarm. If a voltage exceeds this upper or lower
limit, the unit will initiate an alarm in the same manner as it does for the digital switch input alarm. When programming
these limits, you may use any value, positive or negative, as either limit. The data used is the ADC value in millivolts or 100
microvolts depending on the analog scale selected. Setting the setpoint to a value larger than 4095 will cause that limit to be
ignored by the program.
COMMAND CODE:
70 = Upper limit
71 = Lower limit
PROGRAM SYNTAX:
[Command code] [Input] [Sign] [Data] #
READ BACK SYNTAX:
[Command code] [Input] #
WHERE:
Input = 1 through 8
Sign = Zero or Non Zero, Zero = negative, Non Zero = positive
Data = 0000 through 4096, the analog converter value
4095 is the maximum converter value and 4096 is the converters over range value
Setting the limit to 4096 will disable that alarm limit
EXAMPLE:
70 1 1 2000 # = Set analog input number 1 high alarm setpoint to +2.000 volts
or +0.2000 volts, depending on the range selected
DEFAULT:
All upper limits, analog inputs = +4096
All lower limits, analog inputs = -4096