Motorola MVME2600 User Manual
EIA-232-D Connections
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B-3
B
Table B-1. EIA-232-D Interconnect Signals
Pin
Number
Signal
Mnemonic
Signal Name and Description
1
Not used.
2
TxD
Transmit Data. Data to be transmitted; input to modem from terminal.
3
RxD
Receive Data. Data which is demodulated from the receive line; output from
modem to terminal.
modem to terminal.
4
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.
message. With RTS off, the modem carrier remains off. When RTS is turned
on, the modem immediately turns on the carrier.
5
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.
transmission can begin. When a modem is used, CTS follows the off-to-on
transition of RTS after a time delay.
6
DSR
Data Set Ready. Output from modem to terminal to indicate that the modem
is ready to send or receive data.
is ready to send or receive data.
7
SG
Signal Ground. Common return line for all signals at the modem interface.
8
DCD
Data Carrier Detect. Output from modem to terminal to indicate that a valid
carrier is being received.
carrier is being received.
9-14
Not used.
15
TxC
Transmit Clock (DCE). Output from modem to terminal; clocks data from
the terminal to the modem.
the terminal to the modem.
16
Not used.
17
RxC
Receive Clock. Output from terminal to modem; clocks input data from the
terminal to the modem.
terminal to the modem.
18, 19
Not used.
20
DTR
Data Terminal Ready. Input to modem from terminal; indicates that the
terminal is ready to send or receive data.
terminal is ready to send or receive data.
21
Not used.