Lake Shore 480, Руководство пользователя, Страница: 79 / 132

Lake Shore Model 480 Fluxmeter User’s Manual
Computer Interface Operation 6-13
6.1.4.5 Program Operation
Once either example program is running, try the following commands and observe the response of the
instrument. Input from the user is shown in
bold and terminators are added by the program. The word [term]
indicates the required terminators included with the response.
ENTER COMMAND? *IDN?
Identification query. Returns an identification string.
RESPONSE: LSCI,MODEL480,1234567,02032004[term]
ENTER COMMAND?
READ?
Reading query. Returns reading in the form ±XXX.XX.
RESPONSE: +273.150E+00[term]
Decimal point is placed appropriate to range.
ENTER COMMAND? RNGDC?
DC Range Query. Returns appropriate range,
0
where 0 = 300 mV·s and 1 = 30 mV·s.
ENTER COMMAND? UNITS?
Units query. Returns an integer from 1 to 11 corresponding
1
to the units being used. In this example, 1 = V·s.
ENTER COMMAND? ACDC?
AC or DC query. Returns appropriate setting,
0
where 0 = DC and 1 = AC.
ENTER COMMAND? FILT?
Filter query. Returns appropriate setting,
0
where 0 = Off and 1 = On.
ENTER COMMAND? FILT 1;FILT?
Turns filter on then returns a 1 to verify the change.
1
ENTER COMMAND?
The following are additional notes on using either IEEE-488 Interface program.
•
If you enter a correctly spelled query without a “ ? ,” nothing will be returned. Incorrectly spelled commands
and queries are ignored. Commands and queries should have a space separating the command and
associated parameters.
• Leading zeros and zeros following a decimal point are not needed in a command string, but are sent in
response to a query. A leading “+” is not required but a leading “–”
is required.
6.1.5 Troubleshooting
New Installation
1. Check instrument address.
2. Always send terminators.
3. Send entire message string at one time including terminators.
4. Send only one simple command at a time until communication is established.
5. Be sure to spell commands correctly and use proper syntax.
6. Attempt both ‘Talk’ and ‘Listen’ functions. If one works but not the other, the hardware connection
is working, so look at syntax, terminators, and command format.
7. If only one message is received after resetting the interface, check the “repeat addressing” setting.
It should be enabled.
Old Installation No Longer Working
8. Power instrument off then on again to see if it is a soft failure.
9. Power computer off then on again to see if the IEEE card is locked up.
10. Verify that the address has not been changed on the instrument during a memory reset.
11. Check all cable connections.
Intermittent Lockups
12. Check cable connections and length.
13. Increase delay between all commands to 50 ms to make sure instrument is not being over loaded.