D
D-1
D
Serial Interface Connections
EIA-232-D Interconnections
Connector J17 houses the four RJ45 sockets on the MVME162LX
Embedded Controller’s front panel which provide the serial interface
connections. Table D-1 lists the pin numbers, signal mnemonics, and
signal descriptions for the RJ45 connectors. The signals are identical for
each serial port.
To interpret this information correctly, remember that the EIA-232-D
interface was developed to connect a terminal to a modem. When
computing equipment is interconnected without modems, one of the units
must be configured as a terminal (data terminal equipment: DTE) and the
other as a modem (data circuit-terminating equipment: DCE). Since
computers are normally configured to work with terminals, they are said to
be configured as a modem in most cases.
Table D-1. Connector J17 Interconnect Signals
Pin
Number
Signal
Mnemonic
Signal Name and Description
1
DCD
Data Carrier Detect. Output from modem to terminal to
indicate that a valid carrier is being received.
2
RTS
Request To Send. Input to modem from terminal when required
to transmit a message. With RTS off, the modem carrier remains
off. When RTS is turned on, the modem immediately turns on
the carrier.
3, 6
SG
Signal Ground. Common return line for all signals at the
modem interface.
4
TxD
Transmit Data. Data to be transmitted; input to modem from
terminal.
5
RxD
Receive Data. Data which is demodulated from the receive line;
output from modem to terminal.
7
CTS
Clear To Send. Output from modem to terminal to indicate that
message transmission can begin. When a modem is used, CTS
follows the off-to-on transition of RTS after a time delay.
8
DTR
Data Terminal Ready. Input to modem from terminal;
indicates that the terminal is ready to send or receive data.
Содержание MVME162LX 200 Series
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