Appendix B - Serial Port Interface; Eia-232D 25 Pin Serial Port Interface; Pin Serial Port Interface - ZyXEL Communications Omni TA128 User Manual

Appendix B - Serial Port Interface

Appendix B - Serial Port Interface

EIA-232D 25 Pin Serial Port Interface

Pin ITU-TSS
Number Signal
Name
1 101
2 103
3 104
4 105
5 106
6 107
7 102
8 109
15 114
17 115
18 141
20 108/2
108/1
21 140
22 125
24 113
25 142

9 Pin Serial Port Interface

Pin ITU-TSS
Number Signal
name
1 109
2 104
3 103
4 108/2
108/1
5 102
6 107
7 105
8 106
9 125
EIA Signal/Pin 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.
EIA Signal/Pin Description
Signal
name
CF Data Carrier Detected (DCD).
BB Received Data(RXD).
BA Transmitted Data(TXD).
CD Data Terminal Ready (DTR).
Connect DCE to line.
AB Signal Ground (GND).
CC Data Set Ready (DSR).
CA Request To Send (RTS).
CB Clear To Send (CTS).
CE Ring Indicator(RI).
B-1
Signal
Direction
DTE -DCE
⇔
⇒
⇐
⇒
⇐
⇐
⇔
⇐
⇐
⇐
⇒
⇒
⇒
⇐
⇒
⇐
Signal
Direction
DTE -DCE
⇐
⇐
⇒
⇒
⇔
⇐
⇒
⇐
⇐