1:Type Designation:
SCHNEIDER AS-BDAP-218 Multiplexer switch module
The AS-BDAP-218 has two programmable digital output bits (dig0 and dig1) which can be used to control external devices. (Note that these are not available on the EIA-422 version due to lack of connector pins). Software commands can be used to set these lines high or low, or to have one or both function as an external buzzer or horn signal. Both lines are 74HC bus-driver outputs and can sink or source up to about 20 mA of current at 0 or 5 volts, respectively.
If either dig0 or dig1 is programmed to act as an external buzzer signal, it acts as an enable signal: when the line is low (0 volts), it should shut off the external buzzer or horn; when the line is high (5 volts), it should turn on the external buzzer or horn. These lines should only be used to drive an external transistor, which in turn drives the external buzzer.
2.Common problem
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