ZyXEL Elite 2864 User Guide - Page 245
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Appendix A EIA-232D INTERFACE Signal pin 1 2 3 4 5 6 7 8 15 17 18 20 21 22 24 25 ITU-TSS Signal name 101 103 104 105 106 107 102 109 114 115 141 108/2 108/1 140 125 113 142 EIA Description Signal name AA Protective Ground (GND). BA Transmitted Data(TXD). BB Received Data(RXD). CA Request To Send (RTS). CB Clear To Send (CTS). CC Data Set Ready (DSR). AB Signal Ground (GND). CF Data Carrier Detected (DCD). DB Transmit Clock Signal (source: DCE). DD Synchronous Receive Clock. Local Analog Loopback Test. CD Data Terminal Ready (DTR). Connect DCE to line. Remote Digital Loop Test. CE Ring Indicator(RI). DA Transmit Clock Signal (source: DTE). Test Indicator. Direction DTE -DCE A-1
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A–1
Appendix A
EIA-232D INTERFACE
Signal
pin
ITU-TSS
Signal
name
EIA
Signal
name
Description
Direction
DTE -DCE
1
101
AA
Protective Ground (GND).
2
103
BA
Transmitted Data(TXD).
→
3
104
BB
Received Data(RXD).
←
4
105
CA
Request To Send (RTS).
→
5
106
CB
Clear To Send (CTS).
←
6
107
CC
Data Set Ready (DSR).
←
7
102
AB
Signal Ground (GND).
8
109
CF
Data Carrier Detected (DCD).
←
15
114
DB
Transmit Clock Signal (source: DCE).
←
17
115
DD
Synchronous Receive Clock.
←
18
141
Local Analog Loopback Test.
→
20
108/2
108/1
CD
Data Terminal Ready (DTR).
Connect DCE to line.
→
21
140
Remote Digital Loop Test.
→
22
125
CE
Ring Indicator(RI).
←
24
113
DA
Transmit Clock Signal (source: DTE).
→
25
142
Test Indicator.
←