Model 820 Technical Reference Manual
B-5
“Read” Variables
A short form of the status command is R3,1 which has a 5
character response.
• The first is an “s” when stabilizing or a space when stable.
• The second is the current mode: “S” for Stopped, “R” for
Running, “P” for Paused, “C” for Calibrating, “V” for
View mode, “O” for stopped with overall data reset and
“C” for stopped with Current data set reset.
• The third character is the Lock Status and is either an “L”
or a “U”. The fourth character is the Halt Line Status and is
a “1” if high and a “0” if low. The fifth or last character
will be an “a” if an Alarm has been detected.
M 5
View
M 6
Mark
M 7
Reset Current Data (use S1,1 for Reset-All)
M 8
Reset Histories Only
M 9
High Resolution Levels (to I/O channel only). Increased resolution I/O is possible by using the M9,1 command. All
sound levels are then sent with an additional fractional character (nnn.nn) giving 1/100th dB resolution. The Model 820
acquires noise data with 1/32 dB resolution. Greater resolution is achieved through averaging. HOWEVER, THIS DOES
NOT IMPROVE ACCURACY. Refer to the specifications or device specific performance results for the accuracy of the
system.
M 10
Lock 820 (leave 820’s power on)
M 11
Lock 820 and Power Off.To unlock the unit and send the lock combination to the unlock parameter with the
S230,cccccccc command where cccccccc is the correct combination entered before locking.
M 12
Disconnect Modem
M 1000
Non-destructive memory test (walking bit)
M 1001
Destructive memory test (pattern test)
Syntax
Variable
Description
Response
R 1
_DEVTYPE
Device manf. and model
String
R 2
_DT.TM
Current Date and Time
ddd ddmmmyyyy hh:mm:ss
R 3
_STAT
Status
RUN/PAUSE/STOP/RESET-C/RESET-
O, LOCKED
R 4
_C.SPL
Current SPL
nnn.nn dB
