Appendix

Appendix 1 Troubleshooting the RS-232C Faults

Check the items in the following table in the event of operating problems with the RS-232C interface.

SymptomLikely causes and remedies
The RS-232C does not operate at all.Is the cable properly connected?

Refer to the instruction manual. "Chapter13, 13.1 Connecting the RS-232C Cable"

Is the unit correctly set?

Refer to the instruction manual. "Chapter13, 13.2 Setting the RS-232C Interface"

Are all the devices that are connected powered on?
An attempt to read data using the CALL RECEIVE statement causes the
RS-232C bus to hang.
Each and every CALL RECEIVE statement must be preceded by a query.
Is the query transmitted incorrect?
Although a command was transmitted, the unit did not operate.Use the "*ESR?" query to check the standard event status register for anomalies.

See CHAPTER 1 , "1.2 The Status Byte and the Event Registers."

Even though a number of queries were sent, only one response was received.Has an error occurred?
The response should be read immediately after each query.

To read several responses in one operation, the corresponding queries must be combined into a single line using the message separator.

An overrun error or a framing error occurs.Is the transfer rate too high?

Reduce the transfer rate.