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Serial Port B MEI
configuration
switches, S1
Use S1 to configure the line interface for serial port B MEI:
Switch pin Function Comments
S1.1 On = RS232 transceiver enabled
RS422/RS485 transceivers disabled
Off = RS232 transceiver disabled
RS422/RS485 transceivers enabled
S1.2 On = Auto Power Down enabled
Off = Auto Power Down disabled
Auto Power Down is not supported on
this board. This signal is only
accessible to permit the user to
completely disabled the MEI interface
for using the signals for other
purposes. To disable the MEI
interface, go in RS232 mode (S1.1 =
ON) and activate the Auto Power
Down feature (S1.2 = ON) - be sure
that no cable is connected to connector
X3.
S1.3 On = 2-wire interface (RS422/RS485)
Off = 4-wire interface (RS422)
S1.4 On = Termination on
Off = No termination