Lakeshore 325, Руководство пользователя, Страница: 106 / 166

Lake Shore Model 325 Temperature Controller User’s Manual
6-20 Remote Operation
6.2.7.2 Program Operation
Once the 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,MODEL325,1234567,1.0/1.0[term]
ENTER COMMAND? KRDG?
Temperature reading in kelvin query. Instrument will return a
string with the present temperature reading.
RESPONSE: +273.15[term]
ENTER COMMAND? RANGE 0
Heater range command. Instrument will turn off the heater. No
response will be sent.
ENTER COMMAND? RANGE?
Heater range query. Instrument will return a string with the
present heater range setting.
RESPONSE: 0[term]
ENTER COMMAND? RANGE 1;RANGE?
Heater range command followed by a query. Instrument will
change to heater Low setting then return a string
RESPONSE: 1[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 and 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 they will be 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
1. Power instrument off then on again to see if it is a soft failure.
2. Power computer off then on again to see if communication port is locked up.
3. Verify that baud rate has not been changed on the instrument during a memory reset.
4. Check all cable connections.
Intermittent Lockups
1. Check cable connections and length.
2. Increase delay between all commands to 100 ms to make sure instrument is not being overloaded.