ORTEC
®
Fission Meter
®
(FM-P3) Portable Neutron Source Identification System
931026D / 060118
iv
MAINTENANCE ............................................................................................................. 23
A.1 Maintenance Intervals ..................................................................................................................... 23
A.2 Changing the Battery Tube Cap O-Rings .......................................................................................... 23
A.3 Changing the Desiccant Plugs .......................................................................................................... 24
A.4 Updating or Reinstalling the Fission Meter Software ...................................................................... 28
SPECIFICATIONS ............................................................................................................ 31
B.1 Panel Assembly Electronics .............................................................................................................. 31
B.2 Fission Meter Controller (Trimble Ranger 3L) ................................................................................. 31
B.3 Electrical and Mechanical ................................................................................................................ 31
B.3.1 Serial Cable Pinouts ............................................................................................................. 32
FIRMWARE COMMANDS .............................................................................................. 33
C.1 Fission Meter Command Summary ................................................................................................. 33
C.2 Multiplicity Counter Data Record Formats Ver. VI (Six Acq. Modes) .............................................. 34
C.2.1 Acquisition Mode 1A Format (DRM = 1) .............................................................................. 34
C.2.2 Acquisition Mode 2A & 2C Format (DRM = 2 or 3) .............................................................. 36
C.2.3 Acquisition Mode 1B and 2B Format (DRM = 4 or 5) .......................................................... 38
C.2.4 Total Cycle Count Format (DRM = 6) ................................................................................... 40
C.2.5 REAL-TIME REPORTING MODE ............................................................................................ 41
C.2.6 Instrument Parameters Format ........................................................................................... 42
C.2.7 Status Word
—
A Format ..................................................................................................... 42
C.2.8 Status Word
—
B Format ..................................................................................................... 43
C.2.9 Valid Command Response ................................................................................................... 43
C.2.10 Data Acquisition Complete (Returned in Both Free-Run and Triggered Modes) ................ 43
C.3 Multiplicity Counter Communications Protocol and Commands Ver. VI (Six Acquisition
Modes) ............................................................................................................................................. 43
C.3.1 BAUD Rate and Format ........................................................................................................ 43
C.3.2 Data Flow Control ................................................................................................................ 44
C.3.3 Request Data Transfer (Ignored If in an Acquisition Cycle) ................................................. 44
C.3.4 DATA Request Mode (DRM) Format ................................................................................... 44
C.3.5 Request Instrument Parameters ......................................................................................... 45
C.3.6 Set Instrument Parameters (Ignored if in an Acquisition Cycle) ......................................... 45
C.3.7 Cnt_stop and Acq_mode Word Format .............................................................................. 46
C.3.8 Start Data Acquisition .......................................................................................................... 46
C.3.9 Stop Data Acquisition .......................................................................................................... 46
C.3.10 Reset Instrument ................................................................................................................. 46
C.3.11 Set Real Time Data Recording Mode On/Off ....................................................................... 47
C.3.12 Operational Notes ............................................................................................................... 47
