J20 Connector; Table 3-10. Connector J20 Interconnect Signals - Motorola MVME712C Installation And Use Manual

Pin
Number
18-19
20
21-23
24
25

J20 connector

Connector J20 is the internal modem port. Each pin connection, signal
mnemonic, and signal characteristic for the modem port connector is listed
in the following table.
Pin
Number
1
2
3
4
5-10
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Table 3-9. Connectors J7 - J10 interconnect signals
Signal
Mnemonic
Not used.
EDTR DATA TERMINAL READY - A signal from the
terminal to the modem indicating that the terminal is
ready to send or receive data.
Not used.
ETTXC4 TRANSMIT CLOCK (port 4 only) - This line can be
configured to clock output data to the modem from the
terminal.
Not used.

Table 3-10. Connector J20 interconnect signals

Signal
Mnemonic
CTS2
TXD2
DCD2
RXD2
MVME712M Transition Module
Signal Name and Description
Signal Name and Description
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.
TRANSMIT DATA - data to be transmitted is
furnished on this line to the modem from the
terminal.
DATA CARRIER DETECT - Sent by the modem to
the terminal to indicate that a valid carrier is being
received.
RECEIVE DATA - data that is demodulated from
the receive line is presented to the terminal by the
modem.
Not used.
3
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