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EIA-232-D Connectors J1, J2, J3, and J4
Connectors J1, J2, J3, and J4 are 8-pin connectors that correspond to the RJ45
EIA-232-D serial ports 1, 2, 3, and 4, respectively, on the front of the
3
MVME712-10. Each pin connection, signal mnemonic, and signal
characteristic for the connectors is listed in Table 3-1.
Table 3-1: EIA-232-D Connectors J1, J2, J3, and J4 Interconnect Signals
Pin Number
1
2
3
4
5
6
7
8
3-2
Signal
Mnemonic
DCD
DATA CARRIER DETECT - Sent by the modem to
the terminal to indicate that a valid carrier is being
received.
RTS
REQUEST TO SEND - RTS is supplied by the ter-
minal to the modem when it is required to trans-
mit a message. With RTS off, the modem carrier
remains off. When RTS is turned on, the modem
immediately turns on the carrier.
GND
GROUND
TXD
TRANSMIT DATA - data to be transmitted is fur-
nished on this line to the modem from the termi-
nal.
RXD
RECEIVE DATA - data that is demodulated from
the receive line is presented to the terminal by the
modem.
GND
GROUND
CTS
CLEAR TO SEND - CTS is a function supplied to
the terminal by the modem, and indicates that it is
permissible to begin transmission of a message.
When using a modem, CTS follows the off-to-on
transition of RTS after a time delay.
DTR
DATA TERMINAL READY (serial port 1) - A sig-
nal from the terminal to the modem indicating
that the terminal is ready to send or receive data.
MVME712-10 Transition Module and I/O Distribution Set UserÕs Manual
Signal Name and Description
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