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...this step . Set the DIP switches on the SP390A - R3 for 2 - or 4 - wire operation . TABLE 1 . SP390A - R3 DIP SWITCHES SWITCH OFF ON 1 TD always enabled ( TD 422 ) TD only enabled during data transmission ( TD 485 ) 2 RD always enabled ( ECHO ON ) R...
...TRADEMARKS USED IN THIS MANUAL Black Box and the Double Diamond logo are registered trademarks of BB Technologies , Inc . Any other trademarks mentioned in this manual are acknowledged to be the property of the trademark owners . We‘re here to help ...