The BCD-to-serial converter will take up to 5 multiplexed BCD and assemble to a serial RS-485 telegram sent each 500ms.
Parallel BCD could be cascaded for up to 8 digits and sent over RS-485. Low power and high reliability unit for many years of trouble free operation. 9 optocoupler inputs and 4 outputs could be used in a flexible way.
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Bare board or IP65 boxed version available – PICTURE IS NOT CORRECT