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ADAM-5560 Series User Manual 172
A.4 RS-485 Data Flow Control
The RS-485 standard uses a single pair of wires to send and receive data. This line
sharing requires some method to control the direction of the data flow. RTS (Request
To Send) and CTS (Clear To Send) are the most commonly used methods.
Figure A.6 RS-485 Data Flow Control with RTS
Intelligent RS-485 Control
ADAM-4510 and ADAM-4520 are both equipped with an I/O circuit which can auto-
matically sense the direction of the data flow. No handshaking with the host (like
RTS, Request to Send) is necessary to receive data and forward it in the correct
direction. You can use any software written for half-duplex RS-232 with an ADAM
network without modification. The RS-485 control is completely transparent to the
user.