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Chapter 6 Warranty and After-sales Service
6.1. Troubleshooting
If you have any trouble in actual use of this converter in your system, please check the connections of cables
and the setting of COM port number. In case you still do not find the cause of the trouble, please prepare a
software with which you can check sending and receiving of data. Then run a loop-back test like following
example to find if there is defect or not.
6.2. Loop-back Test by Communication Software
The following example is a case by Tera Term (freeware).
(Note: Tera Term is not supported by LINEEYE. Procedure may be different depending on the version
of the software.)
1. Make a loop-back setting referring to following tables depending on the model of the converter.
■
SI-35USB RS-422 (full duplex) loop-back test
In case you do the test when SW-A No.4 is on, you need to make DTR signal active by the communications
software before sending data.
■
SI-35USB RS-485 (half duplex) loop-back test.
SW-A SW-B
No.1
OFF
No.1
ON
With echo back
No.2 OFF
No.2 ON
RS-422
No.3
OFF
No.3
ON
TR with terminal control
No.4
OFF
Auto
No.4
ON
R with terminal control
No.5 OFF
SW-A SW-B
No.1
OFF
No.1
OFF
With echo back
No.2 OFF
No.2 OFF
RS-485
No.3
OFF
No.3
ON
TR with terminal control
No.4
OFF
Auto
No.4
OFF
R without terminal control
No.5 OFF
