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RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL
© 2007 DH Instruments, a Fluke Company Page 60
The display prompts you to connect COM1 to COM2 using a standard pin-to-pin
DB-9F to DB-9M RS232 cable (see Section 4.2.1.1, 4.2.1.3).
Once the cable has been installed, press [ENT] to run the self-test. The test is first
executed in the COM1→COM2 direction and then in the COM2→COM1 direction.
If the COM1→COM2 test passes: <PASSED> displays briefly and the test
proceeds to COM2→COM1.
If COM2→COM1 passes: <PASSED> is displayed briefly followed by the
conclusion, <The RS232 test has PASSED>.
If a test fails: Execution is suspended until [ENT] is pressed.
The RPM4 RS232 test can fail for three reasons:
1. The RS232 cable being used is incorrect (Section 4.2.1.1, 4.2.1.3 for information
on the correct cable).
2. COM1 and COM2 do NOT have the same serial communications settings and
therefore cannot communicate together (see Section 3.5.2.1 to set the
COM ports).
3. COM1 or COM2 is defective.
The reason for failed communications is almost always a cable or incorrect RS232
interface settings. Be sure that these are correct before concluding that a COM port
is defective.
3.5.3 <3HEAD>
PURPOSE
To view or change the properties of the HEAD function (see Section 3.3.7) including the unit of
measure of length for head height entry and the test fluid type and species for density calculations.
OPERATION
From the MAIN RUN screen, press [SPECIAL], <3Head>.
Select the desired height unit of measure and press [ENT].
Select <1gas> or <2liqud> depending on the pressurized medium between the RPM4 and
the height at which pressure is to be calculated. Select the gas or liquid species. The liquid
selection <3User>, is to create a custom liquid with a user entered density.
Use [HEAD] to set a head height if desired.
3.5.4 <4SDS>
PURPOSE
This feature is not used in RPM4 A70M/A20M-AF.
3.5.5 <5PREFS>
PURPOSE
To access a menu of RPM4 operational preferences and functions.
OPERATION