Lake Shore Model 332 Temperature Controller User’s Manual
6.2.7.3 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,MODEL332,123456,020301[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 ensure instrument is not being over loaded.
Remote Operation
6-21
