14.1 Troubleshooting
291
14
4. Communications issues
The communications monitor (p.231) function can be used to more easily check operation.
No Issue Items to check Possible causesSolutions See
4-1 The instrument is
not responding at
all.
Display RMT is not
being displayed.
No connection has been established.
Check whether the connector has been
connected.
Check whether the interface settings have
been configured properly.
(USB) Install the driver on the control
device.
(RS-232C) Use a cross cable.
(USB, RS-232C) Check the COM port num-
ber on the control device.
(RS-232C) Use the same communications
speed for the instrument and the control
device.
p.221
RMT is being
displayed.
Commands are not being accepted.
Check the software delimiter.
(GP-IB) Check the message terminator set-
ting.
(GP-IB) Check whether the address setting
has been configured properly.
p.229
4-2 An error is being
encountered.
Display Command error The command isn’t being recognized as a
valid instruction.
Check the spelling of the command (space:
x20H).
Do not append a question mark to com-
mands that are not queries.
(RS-232C) Use the same communications
speed for the instrument and the control
device.
The input buffer (256 bytes) is full.
Insert a dummy query after sending several
lines of commands.
Example: Send
∗OPC? Receive 1
Execution error The command string is correct, but the instru-
ment is not able to execute it.
Examples:
• When set during scanning
• The data portion was spelled incorrectly.
:SAMP:RATE SLOW3
Check the specifications of the command(s)
in question.
The input buffer (256 bytes) is full.
Insert a dummy query after sending several
lines of commands.
Example: Send
∗OPC? Receive 1
4-3 The instrument
fails to respond to
queries.
Commu-
nications
monitor
No response
The
:TRIG:SOUR EXT setting is being
used, and the instrument is waiting for the trig-
ger after
:READ? transmission.
Check the command specifications.
Response There is a mistake in the program.
Check the receive portion of the program.
4-4 The instrument
cannot switch to
multiplexer chan-
nels or load the
multiplexer.
Front
measure-
ment ter-
minals
Measurement
leads are con-
nected
Measurement leads are connected to the
measurement terminals on the front of the
instrument.
Do not connect measurement leads to the
measurement terminals on the front of the
instrument when using the multiplexer.
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