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BCD Output Option

An optional plug-in board provides an isolated three-state, parallel, stored Binary Coded Decimal (BCD) output to external devices such as PLC's, panel-mount printers, and dataloggers.  The output rate can be either continuous or programmable (to accommodate printers that print at programmed time intervals).

Signal levels are LPTTL- and CMOS-compatible (selectable for 5 or 15 VDC logic).  Isolated power for the BCD outputs is provided by an on-board supply, to ensure freedom from ground loops.

BCD connections are via a 30-pin 0.1" mass termination ribbon cable connector on the rear on the BCD output board.

BCD outputs of multiple meters—as in the second figure below—can be multiplexed by addressing each meter with its own "Enable" line.  Only the addressed meter will provide data output, while the other non-addressed meters are held in a non-transmitting, high-impedance output state.  "BCD Hold" and "Data Ready" outputs further simplify the interface.

Parallel BCD Communications
Multiplexing of Multiple BCD Outputs