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13.11 SELECT DATA POLARITY: JUMPER S8
Inserting the jumper in S8B (the usual shipping position) makes the output
data (including decimal point code) positive-true. Placing the jumper in S8A
converts the data to negative-true.
13.12 DECIMAL POINT ADDRESS CODE
P8-U15, P8-L8 and P8-U8 output a 3-bit positive-true binary code for the
location of the decimal point: "001" for the extreme right position and "110"
for the extreme left position (just to the right of the left-hand digit).
Panel-mounted printers, however, may require an inverted/shifted decimal
point code. You can create this by setting "OUT.5=1" in the "OUT.CNF" byte
(unlocked by setting "L1C.7=0"), rather than the normal "OUT.5=0".
13.13 APPLYING NON-ISOLATED/ISOLATED POWER
Non-isolated power from the meter is connected to this board by inserting
jumpers S6A, S6B, S7A, and S7B (bridging the isolation separation distance
on the board). Current drawn is less than 10 mA.
To isolate these outputs from the other meter circuits, remove the four
jumpers described earlier, and connect an external, nominal 5 V supply to
P8-L17, with its ground return connected to P8-L15.
13.14 DRIVING A PRINTER
Direct connection of the 24 BCD lines and the 3 decimal point address lines
is all that is needed for positive-true printers that accept a binary-coded
decimal point address (which do not print the decimal point).
If your printer has more than 6 digits, tie the unused inputs to ground or V+
or leave open (whichever produces blanks in those locations).
For negative-true decimal point addresses, found in some panel-mounted
printers, set "OUT.5=1" (part of menu item "OUT.CNF", unlocked by
"L1C.7=0").
BCD Option
13
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