Lake Shore Model 218 Temperature Monitor User’s Manual
6-16
Remote Operation
6.2.8 Trouble
Shooting
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 over
loaded.
6.3 IEEE-488/SERIAL
INTERFACE
COMMANDS
Parameter conventions in the command list are:
<??? enable>
A parameter with
enable
in the name uses these values:
0
(disabled) or
1
(enable).
<??? status>
A parameter with
status
in the name uses these values:
0
(disabled/off) or
1
(enabled/on).
<??? value>
A parameter with
value
in the name is specified in floating point format.
<bit weighting>
A number between 0 and 255 derived from the sum of all the weighted bit values.
<input>
Indicates which sensor input to use. Valid values:
1
–
8
.
<off/on>
Indicates whether an item is turned off or turned on.
0
is off and
1
is on.
<output>
Indicates which analog output to use. Valid values:
1
–
2
.
[term]
Used when examples are given and indicates where terminating characters should
be placed by the user or where they appear on a returning character string from the
Model 218.