Bytes 3–9 is the measured pressure.
This string represents the true measured
pressure if byte 10 indicates a stable pres-
sure. The seven characters may include a
decimal point with the same fractional dig-
its as displayed on the front panel of the
PCS. Leading blanks will be filled with
spaces (ASCII 20 Hex).
Byte 10 is the instrument status.
Where ‘S’ indicates a stable pressure: This
means the servo system has been within the
control window. In the CONTROL mode
this indicates the measured pressure is
within the window of the commanded con-
trol pressure, where the window is set
through the front panel or using the appro-
priate _PCS4 GPIB command.
Where ‘U’ indicates an unstable pressure:
This means the servo system is driving to
null out all errors or is oscillating more
than the window (specified above) around
null. In the MEASURE and VENT modes
this would indicate the system is seeking a
new pressure reading. In the CONTROL
modes the ‘U’ indicates the measured read-
ing does not match the commanded control
pressure or the servo system may be oscil-
lating and in need of adjustment.
Bytes 11–17 is the control pressure.
This is the current (last used) control pres-
sure. This string may include a decimal
point and leading spaces (ASCII 20 Hex).
Byte 18 is the communication status.
This character is an ‘R’ to indicate the PCS
is in the REMOTE mode.
The following example indicates the PCS is meas-
uring pressure in inH2O. The current pressure
reading is 102.357 but is an unstable reading. The
last control pressure entered was 200.000 and the
reading was taken over the GPIB port.
M3102.357U200.000R
NOTE: Status byte doesn’t support error
conditions at this time.
Re-initialize
Long format (11 bytes):
1234 567891011
F000 00000 1 X
Bytes 2–9 are ignored.
Short format (3 bytes):
123
R1 X
This command will place the PCS in the initializ-
ing status similar to that when first powered up.
The PCS will not communicate over the GPIB
during the initialization. When a user program
sends the RE-INITIALIZE command, this shut-
down of communications should be anticipated.
Otherwise, device timeouts in the user program
are likely to occur. This command also causes
all the buffers to be cleared and the PCS to go to
the LOCAL modes on the GPIB. The output
format will be the standard format.
Return Cal Data
This command is not supported by the PCS 400.
Return Unit ID
Long format (11 bytes):
1234 567891011
F000 00000 3 X
Bytes 2–9 are ignored.
Short format (3 bytes):
123
R3 X
These commands change the output format to
transfer the unit ID data. When the short form is
used on the serial port it also causes the data to
be output. On the GPIB the output format is valid
for one output only. On the serial port the output
format remains until changed.
Returns a 20 byte string:
*$;•MENSOR•••PCS-400•••V#.##••####.#
######SN######<CR><LF>
REMOTE OPERATION PCS 400
4-14 www.mensor.com
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