ZyXEL Communications 2864 Series, User Manual, Page: 245 / 267

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.
←