USB to Serial Converters Manual
Version 2.0
Document Reference No.: CP_000032 Clearance No.: CP#022
Copyright © Connective Peripherals Pte Ltd
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The following diagram shows an RS-422 full-duplex bus with handshaking signals connected. The ES-U-
xxxx-x has built-in resistors for terminating its RxD +/- and CTS +/- inputs, which can be enabled using
jumpers. The TxD +/- and RTS +/- lines which are outputs from the ES-U-xxxx-x are terminated at the
receiver at the other end of the bus as shown. Twisted pair wires are required for each signal pair.
Figure 25 - RS-422 with Handshaking Signals Connected
RS-422 Device
ES-U-xxxx-x
RxD+
TxD+
RxD-
TxD-
TxD+
RxD+
TxD-
RxD-
GND
GND
CTS+
RTS+
CTS-
RTS-
RTS+
CTS+
RTS-
CTS-
