DH Instruments E-DWT-H, Руководство по эксплуатации и обслуживанию

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E-DWT-H OPERATION AND MAINTENANCE MANUAL
© 2009 DH Instruments, a Fluke Company Page 60
3.9.2.2 <3IEEE-488>
An IEEE-488 interface is not included in the E-DWT-H A70M/A7M-AF model.
3.9.2.3 <4FORMAT>
The RPM4-E-DWT has two different syntax formats available for the remote
program commands.
The classic remote command format is highly intuitive and conforms with
previous DHI PPC and RPM4 products.
The enhanced remote command format generally uses the same commands as
the classic format, but in addition it follows the syntax, format, and status
reporting features of IEEE Std 488.2.
The details of each format are covered in Section 4.3.
[SPECIAL] , <2remote> , <4format> allows the remote program command syntax
to be selected. The cursor is on the active format. Select <1classic> or
<2enhanced> as desired.
3.9.2.4 <5RS232 SELF-TEST>
The RS232 self-test is provided to check the RPM4-E-DWT COM ports and the
interface cable independently of an external device or computer.
If you are having difficulty communicating with RPM4-E-DWT from a host
computer using RS232,
the RS232 self test can help establish that the
RPM4-E-DWT 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.
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.
Note
The RPM4-E-DWT RS232 test can fail for three reasons:
The RS232 cable being used is incorrect (Section 4.2.1.1,
4.2.1.2) for information on the correct cable).
COM1 and COM2 do NOT have the same serial communications
settings and therefore cannot communicate together (see
Section 3.9.2.1 to set the COM ports).
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.