Sper Scientific 840012 Sound Meter with Detachable Probe - Manual (Page 6)

- 6 -
3-H. AUTOMATIC SHUT OFF
After approximately 10 minutes without activity (with no buttons
pushed), the meter will automatically shut off. To disable this feature,
press the REC (9) button.
3-I. BATTERY REPLACEMENT
When the low battery icon is displayed, open the BATTERY (18)
compartment to install a fresh 9V alkaline or heavy duty type battery.
In-spec measurements may be made for several hours after the icon
appears.
3-J. RS232 PC SERIAL INTERFACE
The instrument features RS232 (16) output via a 3.5 mm terminal. The
signal output is a 16-digit data stream that can be adapted to user-
defined applications. A RS232 lead with the following connection is
required to link the instrument with the PC serial interface.
The 16 digit data stream will be displayed in the following format:
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
D0 End word
D1 & D8 Display reading, D1 = LSD, D8 =MSD.
Example: Display reads 1234, then D8 to D1
is 00001234
D9 Decimal Point (DP), position from right to left
0 = NO DP, 1 = 1 DP, 2 = 2 DP, 3 = 3DP
D10 0=Positive, 1=Negative
D11 & D12 Indicator for Display, dB = 17
D13 1
D14 4
D15 Start word
Each digit indicates the following status:
Meter (3.5 mm jack plug) PC (9W ‘D” Connector)
Center Pin ..................................Pin 4 Pin 2 2.2 K
Ground/shield .............................Pin 2 Pin 5 resistor