3. OPERATION
Page 65 © 2002-2007 DH Instruments, a Fluke Company
[SPECIAL], <2remote>, <4format> allows the remote program command
syntax to be selected. The cursor is on the active format. Select <1classic> to
activate the classic command format or <2enhanced> for the enhanced format.
Selecting a format resets the IEEE-488 interface and puts it into an idle state.
3.5.2.4 <5RS232 SELF-TEST>
The RS232 self-test is provided to check the PPC3 COM ports and the interface
cable independently of an external device or computer.
If you are having difficulty communicating with PPC3 from a host computer
using RS232, the RS232 self test can help establish that the PPC3 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).
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 PPC3 RS232 test can fail for three reasons:
1. The RS232 cable being used is incorrect (see Section 4.2.1.1 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 gas species for density calculations.
OPERATION
From the MAIN RUN screen, pressure [SPECIAL], <3Head>.
Select the desired height unit of measure and press [ENT].
Select the type of gas that is being supplied to PPC3 and press [ENT]. The characteristics of
the gas selected will be used by PPC3 in calculating head pressures.
Use [HEAD] to set a head height if desired.
To Next Page
Loading...