PG7000™ OPERATION AND MAINTENANCE MANUAL
© 1998-2008 DH Instruments, a Fluke Company
Page 120
3.11.5.3
RS232 SELF TEST
The RS232 self-test is provided to check the PG7000 COM ports and the
interface cable independently of an external device or computer.
If you are having difficulty communicating with PG7000 from a host
computer using RS232,
the RS232 self test can help establish that the PG7000
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 or COM1 and COM3),
press
[SPECIAL]
and select
<5remote>
,
<5RS232test>
. Then select
<1COM2>
to test COM1 and COM2 or
<2COM3>
to test COM1 and COM3.
The display prompts you to connect COM1 to COM2 or COM1 to COM3 using a
standard pin-to-pin DB-9F to DB-9M RS232 cable (see Section 4.2.1).
Once the cable has been installed, press
[ENTER]
to run the self-test. The test
is first executed in the COM1
→
COM2 (or COM3) direction and then in the COM2
(or COM3)
→
COM1 direction.
If the COM1
→
COM2 (or COM3) test passes:
<PASSED>
displays briefly and
the test proceeds to COM2 (or COM3)
→
COM1.
If COM2 (or COM3)
→
COM1 passes: <PASSED> is displayed briefly followed
by the conclusion, <PG7000 RS232 test has PASSED>.
If a test fails:
Execution is suspended until
[ENTER]
is pressed.
The PG7000 RS232 test can fail for three reasons:
1. The RS232 cable being used is incorrect (see Section 4.2.1, for information on
the correct cable).
2. COM1 and COM2 (or COM3) do NOT have the same serial communications
settings and therefore cannot communicate together (see Section 3.11.5.1 to set
the COM ports).
3. One of the COM ports 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.
3.11.5.4
EXTERNAL BAROMETER (RPM) COMMUNICATIONS
(COM2)
PURPOSE
To set up communications with an external barometer from which PG7000 will
read the value of atmospheric pressure used in its internal calculations. The
external device is also used for reading the static pressure when PG7601 is used
in differential mode (see Section 3.9.4).
The source of the values of atmospheric pressure used by PG7000 in its
internal calculations is determined by the AtmP setting in the current SETUP file
(see Section 3.10). Setting up communications with an external barometer does NOT
set PG7000 to utilize the external barometer.
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