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RPM4™ OPERATION AND MAINTENANCE MANUAL
© 2004-2007 DH Instruments, a Fluke Company Page 64
3.5.2.4 <5RS232 SELF-TEST>
The RS232 self-test is provided to check the RPM4 COM ports and the interface
cable independently of an external device or computer.
If you are having difficulty communicating with RPM4 from a host computer
using RS232, the RS232 self test can help establish that the RPM4 COM1 port
you are trying to communicate with and the interface cable you are using are good.
To run a self test of the RS232 ports (COM1 and COM2), press [SPECIAL],
<2remote>, <5RS232test>.
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, pressure [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.