Table 3-5. COM1 and COM2 Interconnect Signals (MVME760) (Continued)
Pin
Signal
Number
Mnemonic
2
RXD
3
TXD
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI
Serial Port 3 Connectors
Two connectors are provided for Serial Port 3: A 26-pin mini delta
ribbon connector located on the front panel of the MVME760
transition module and a 26-pin ribbon-cable (3M-type) header
located on the board itself. The pin assignments for these two
connectors are shown in Table 3-6. The mini delta ribbon connector
shield is tied to chassis ground.
Signal Name and Description
RECEIVE DATA - data that is demodulated from
the receive line is presented to the terminal by the
modem.
TRANSMIT DATA - data to be transmitted is
furnished on this line to the modem from the
terminal.
DATA TERMINAL READY - A signal from the
terminal to the modem indicating that the terminal
is ready to send or receive data.
SIGNAL GROUND
DATA SET READY - DSR is a function supplied by
the modem to the terminal to indicate that the
modem is ready to transmit data. This signal can be
held high or low through header J8, J9, J13, J14.
REQUEST TO SEND - RTS is supplied by the
terminal to the modem when it is 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.
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.
RING INDICATOR - Sent by the modem to the
terminal indicating the ringing signal is present.
Serial Port 3 Connectors
3-17
3
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