Monroe Electronics Electrostatic Fieldmeter - Static Monitor - model 177A - Manual (Page 26)

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Note: Alarm level must be greater than the Warning level. Full
scale setting must be greater than or equal to the alarm levels.
Alarm Delay – Delay time for the alarm/warning relay to open after
the value exceeds the set level. Default is 0 seconds. Setting an
alarm delay can prevent erroneous alarms.
Auto zero – Time and Level – When the Zero button is pressed
auto-zero begins. If the channel reading reaches the level within
the time period, the process stops and shows done. If it times out
without reaching the level, it will show error and exit out of the auto-
zero process. Default time for Auto-Zero time is 20 seconds.
Default for Auto-Zero level is  3v.
After editing a program you may save it to your hard drive or send it
to the 177A as it’s active program. First exit the Edit Channel
window by clicking on O.K., then from the Store drop-down menu:
Click on Active Program or Program 1, 2, 3, or 4 to store your
program into permanent memory. If program 1, 2, 3, or 4 is set as
your active program those changes will also be applied.
Hardware Config – Permits selection of the station (unit) number,
system type, active program, probe type, outputs, serial port, and baud
rate.
Station Number – Each 177A should be assigned a unique number for
identification, especially when more then one unit is connected to the
RS-485 bus. Station numbers may range from 1 to 255.
Active Program – Selects the program P0 (default) or P1 – P4 to be
activated.
System Type – Selects the alarm mode for the instrument
Non-Alarm – Alarms are disabled
Alarm Latching – When the probe reading exceeds the alarm level the
alarm relay latches causing the alarm LED for that channel to light.
Alarm remains in latched or in Alarm mode until the corresponding
channel ENA/DIS button is pressed on the instrument’s front panel, reset
from the PC or by external reset connection.
Alarm Unlatching - When the probe reading exceeds the alarm level the
alarm relay latches causing the alarm LED for that channel to light.