Lutron Electronics GM-300P Operation Manual page 13

An RS232 lead with the following connection will
be required to link the instrument with the PC
serial input.
Scale
(3.5 mm jack plug)
Center Pin........................................ Pin 4
Ground/shield...................................... Pin 2
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
Each digit indicate the following status :
D15 Start Word
D14 4
D13 1
D12, D11 Annunciator for Display
g = 57
oz = 58
count = 30
D10 Polarity
0 = Positive
D9 Decimal Point(DP), position from right to the left
0 = No DP, 1= 1 DP, 2 = 2 DP, 3 = 3 DP
D8 to D1 Display reading, D1 = LSD, D8 = MSD
For example :
If the display reading is 1234, then D8 to D1 is :
00001234
D0 End Word
RS232 FORMAT : 9600, N, 8, 1
Baud rate 9600
Parity No parity
Data bit no. 8 Data bits
Stop bit 1 Stop bit
PC
(9W 'D" Connector)
Pin 5
1 = Negative
11
2.2 K
resistor
1109-GM300P