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Technical Reference for ZyXEL omni.net series
D-1
Appendix D
Serial Port Interface
EIA-232D 25 Pin Serial Port Interface
Pin #
Description
ITU-TSS
Signal
Name
EIA
Signal
Name
Signal Description
Signal Direction
DTE - DCE
1 GND 101 AA Protective Ground
+*
2 TXD 103 BA Transmitted Data
*
3 RXD 104 BB Received Data
+
4 RTS 105 CA Request To Send
*
5 CTS 106 CB Clear To Send
+
6 DSR 107 CC Data Set Ready
+
7 GND 102 AB Signal Ground
+*
8 DCD 109 CF Data Carrier Detected
+
15
Clock Source:
DCE
114 DB Transmit Clock Signal
+
17 Sync RX Clock 115 DD Synchronous Receive Clock.
+
18 LA/LBK 141 Local Analog Loopback Test.
*
20 DTR
108/2
108/1
CD
Data Terminal Ready.
Connect DCE to line.
*
21 RD/LBK 140 Remote Digital Loop Test.
*
22 RI 125 CE Ring Indicator
+