PPC2 AF OPERATION AND MAINTENANCE MANUAL
© 1998 DH Instruments, Inc. Page 120
5.5.4 RELAY
Internal relays are used to switch the measurements inputs from the normal measurements
lines to the internal voltage references while auto calibrating. These can be manually switched
to determine how the PPC2 AF is functioning. This along with the DISP modes can assist in
troubleshooting.
This menu can also be accessed directly from the display run screen by pressing the +/- key if
the display is not in the norm mode.
5.5.4.1 AMBIENT
The ambient relays menu can switch the ambient pressure and temperature
inputs to ground, or the internal voltage reference. The relays will stay in this
position until the next auto calibration.
5.5.4.2 ANALOGOPT
Not available.
5.5.5 VALVE
The state of the internal valves can be viewed or changed in this menu. Pressing the 1
through 8 buttons will toggle the state of the associated valve. Pressing the ENTER key will
give the option to choose toggle or momentary operation. The 8 valve can only be opened if
the 5 valve is currently open.
5.5.6 TEST
This selection allows testing of the COM1 and the COM2 ports. The COM1 and COM2 ports
must be looped back for this test. The loop back test connector must have pin2 and pin3
connected together. This loops back the TX into the RX port.
5.5.7 LOG
The error and over pressure log can be viewed. Each log screen has the log description
which appears and a second screen accessed by pressing the +/- key that has the date and
time of the log entry. The ENTER key increments to the next Log.
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