Setra System Model Datum 2000 - Manual (Page 12)

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Step 5.
Set the LO ALARM Point.
Note: The decimal point that was set during calibration (CAL_U, CAL_C) will
be displayed.
Press the SCAN/adj key to move the numbers up (+).
Press the HOLD/mode key to move the numbers down (-).
When the desired number is reached, press the SCAN/adj and HOLD/mode
keys at the same time. The number will flash repeatedly. Then, press the
SCAN/adj key to readjust it or the HOLD/mode key to accept it.
Step 6.
Repeat the same procedure as in Step 5 to set the HI ALARM Point.
After the number is accepted the DATUM 2000™ will resume normal
operation.
ALARM OUTPUT
The alarm outputs are available on the terminal strip on the back of the
meter. The signals available are HI ALARM, position 2, LOW ALARM,
position 3, and CH1/CH2, position 4.
A TTL level ( 5 volt logic ) high signal on the LOW or HIGH alarm lines
indicates an alarm condition. The corresponding LED on the front panel will
also be lit. If pin 4, “CH1/CH2” is low, the alarmed channel is Channel 2; if
pin 4 is high, the alarmed channel is Channel 1. These lines can sink up to
12 mA or source up to 8 mA.
Keep in mind that the meter will continue to scan both channels if 2 channels
are calibrated and the DATUM has not been locked onto a single channel.
The alarm outputs will change to represent the channel being displayed.
SCAN HOLD
adj mode
–25. 0.
SCAN HOLD
adj mode
25. 0.