July 2002
Intermediate to advanced
344 pages
8h 37m
English
Content preview from Newnes Radio and RF Engineering Pocket Book, 3rd Edition
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273
9-Pin connector
Pin
number
Pin
name
Description
1 DCD Data carrier detect
2 RXD Receive data
3 TXD Transmit data
4 DTR Data terminal ready
5 GND Ground
6 DSR Data set ready
7 RTS Ready to send
8 CTS Clear to send
9 RI Ring indicator
Automatic calling
A similar series of interchange circuits is defined in ITU-T recommen-
dation V25 for automatic calling answering between modems over the
telephone network. This is the 200 series interchange circuits:
Interchange circuit
Number
Name
From DCE
To DCE
201 Signal ground ••
202 Call request •
203 Data line occupied •
204 Distant station connected •
205 Abandon call •
206 Digit signal (2
0
) •
207 Digit signal (2
1
) •
208 Digit signal ...
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