Lake Shore 475, Руководство пользователя

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Lake Shore Model 475 Gaussmeter User’s Manual
6-24 Remote Operation
6.2.7.2 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. Instrument will return a string identifying itself.
RESPONSE: LSCI,MODEL475,1234567,02032003[term]
ENTER COMMAND? RDGFIELD?
Field reading query. Instrument will return a string with the present
field reading in the present units.
RESPONSE: +273.150E+00[term]
ENTER COMMAND? RANGE 1
Field range command. Instrument will set to the lowest range. No
response will be sent.
ENTER COMMAND? RANGE?
Field range query. Instrument will return a string with the present field
range setting.
RESPONSE: 1[term]
ENTER COMMAND? RANGE 5;RANGE?
Field range command followed by a query. Instrument will change to
the highest range setting then return a string
RESPONSE: 5[term]
with the present setting.
The following are additional notes on using either Serial 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.
6.2.8 Troubleshooting
New Installation
1. Check instrument Baud rate.
2. Make sure transmit (TD) signal line from the instrument is routed to receive (RD) on the computer and vice versa.
(Use a null modem adapter if not).
3. Always send terminators.
4. Send entire message string at one time including terminators. (Many terminal emulation programs do not.)
5. Send only one simple command at a time until communication is established.
6. Be sure to spell commands correctly and use proper syntax.
Old Installation No Longer Working
7. Power instrument off then on again to see if it is a soft failure.
8. Power computer off then on again to see if communication port is locked up.
9. Verify that Baud rate has not been changed on the instrument during a memory reset.
10. Check all cable connections.
Intermittent Lockups
11. Check cable connections and length.
12. Increase delay between all commands to 100 ms to make sure instrument is not being over loaded.