Special Designs with CPCI-CAN-ISO11898 Add-On
Hardware-Manual • Doc.-No.: I.2306.21 / Rev. 3.5
CPCI-405
Page 42 of 57
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5.3.3 RS-485 interface
Fig. 5.3.3: Connection scheme for RS-485 operation
For the RS-485 interface the data direction (receive/transmit) of the driver component has to be
switched by software. The data direction can be switched with the RTS-signal, which is connected with
the data enable (DE) of the driver component.
receive:
DE(RTS) has to be set to ‘0’
transmit:
DE(RTS) has to be set to ‘1’ and reset with stop-bit
Fig. 5.3.4: Set RTS to transmit and receive