Sper Scientific 840088 pH Kit - Basic - Manual (Page 10)

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6 . RS232 PC SERIAL INTERFACE
The instrument features a 3.5 mm RS232 OUTPUT TERMINAL (14). The
signal output is a 16-digit data stream that can be adapted to user-defined ap-
plications. A RS232 lead with the following connection is required to link the
instrument with the PC serial interface.
7. BATTERY REPLACEMENT
When the left corner of the LCD displays the low battery icon install 4 new AA
1.5V batteries. Slide the BATTERY COVER (10) away from the instrument
to remove the old batteries. When the clock is no longer accurate, replace
the 3V button cell battery located in the compartment behind the AA's. Re-
attach the battery cover when you have finished. In-spec measurements may
be made for several hours after the low battery indicator appears.
The 16 digits 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
Each digit indicates the following status:
D0 End Word = 0D
D1 & D8 Display reading, Dl = LSD, D8 = MSD
(If the display reading is 1234, then D8 to D1 is: 00001234)
D9 Decimal Point (DP), position from right to the left
D10 Polarity: 0 = Positive 1 = Negative
D11 & D12 Annunciator for Display
°C = 01 Knot = 90 mile/h = 12
°F = 02 Km/h = 10 CMM = 84
m/S = 08 ft/min = 11 CFM = 85
D13 The upper display data = 1, The lower display data = 2
D14 4
D15 Start Word = 02
RS232 Com Port Setting: 9600, No parity, 8 Data bits, 1 Stop bit
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