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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. ←