Rev. 2 63
Remote Interface Reference
Serial Command Set Reference
with a standard, low cost converter configured as a DTE device, 115,200
baud, 8 data bits, no parity, and 1 stop bit. In order to communicate with
the host device, it is necessary to set the terminal program to the identical
baud rate of the host device.
5.5 Command Set Reference
All commands sent to the Model 1700 are processed and the Model 1700
responds with a return value (if applicable) and termination. If the
command is invalid, the Model 1700 will respond with an error code (see
the Error Codes section). All return values including error codes are
terminated with <CR><LF> (i.e. a carriage return followed by a linefeed).
For those commands that do not return a value, the Model 1700 will return
the <CR><LF> termination only.
The remote units settings are saved in non-volatile memory and are
restored at power-up.
The Model 1700 instrument may be configured for reading liquid nitrogen,
liquid helium, or both. Some commands will not be applicable if the
instrument is not configured for certain level measurement.
5.5.1 Commands for determining the instrument configuration
Command: N2?
Function: Returns a 0 if the instrument is not configured to read liquid nitrogen
level, a 1 if it is with the internal oscillator, and a 2 if it is with an
external oscillator/transmitter.
Returns: 0, 1 or 2<CR><LF>
Default: N/A
Command: HE?
Function: Returns a 0 if the instrument is not configured to read liquid helium
level, a 1 if instrument is configured to read 4.2K liquid helium level
for sensors of active length ≤ 40 inches, 2 if instrument is configured to
read 4.2K liquid helium level for sensors of active length ≤ 80 inches, a
3 if the instrument is configured to read 2K liquid helium level for
sensors of active length ≤ 40 inches, 5 if instrument is configured to
read 2K liquid helium level for sensors of active length ≤ 80 inches.
Returns: 0, 1, 2, 3, 4 or 5<CR><LF>
Default: N/A
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