DCB EtherSeries EDNP-3, Руководство пользователя

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Specifications
Control Signal Operation
DCD
Input, ignored
Receive Data
Input, data into the unit
Transmit Data
Output, Data from the unit. The Etherseries unit only transmits
when it has characters to send, and if handshaking is enabled,
when the CTS input is asserted.
DTR
Output. Signal is asserted when the unit is powered on.
Signal Ground
Common ground
DSR
Input, ignored.
RTS
Output. If handshaking is disabled, this signal is always
asserted. If handshaking is enabled, it will be asserted when the
gateway has a packet to transmit on the serial port and it will be
de-asserted when transmission is complete.
CTS
Input. When handshaking is disabled, this signal is ignored.
When handshaking is enabled, the gateway will wait for CTS to
be asserted before transmitting a packet on the serial port.
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